Get help on our basic JavaScript and Algorithms Challenges. If you are posting code that is large use Gist - https://gist.github.com/ paste the link here.
@Duffy125 use == or === to compare (unless the table specifies <= or >=), = is used to assign values
function golfScore(par, strokes) {
// Only change code below this line
if (strokes ==1)
{return "Hole-in-one!";}
else if(strokes <=par-2)
{return "Eagle";}
else if (strokes==par - 1 )
{return "Birdie";}
else if (strokes==par)
{return "Par";}
else if (strokes == par +1)
{return "Bogey";}
else if (strokes == par +2)
{ return "Double Bogey";}
else if(strokes >= par + 3)
{return " Go Home!";}
return (par,strokes);
its saying the Go Home is wrong
@Duffy125 you have a space before Go, delete it
haha yep that it thanks
:+1:
click more info below to see how to format your code for the chat room (that'll make it easier to read)
:bulb: to format code use backticks! ``` more info
Damnn I was stumped, like REALLY stuck on the first handful of algorithms
For Js... but now I've spent so much time looking for answers and trying/failing to do these that I've learned so many new things and this was the first one I just breezed through
function confirmEnding(str, target) {
if ( str.substr((str.length - target.length), target.length) === target) { return true; } else {
return false;
}
}
confirmEnding("Bastian dog", "dog");
@Lanceward410 review this challenge: https://www.freecodecamp.com/challenges/returning-boolean-values-from-functions
@Chrono79 What is it exactly you want me to do with it? I see you've got the correct answer
@Lanceward410 see how they don't return true or false there? And what you see is your own solution
@Chrono79 I see, I might as well just return the whole statement
exactly
@florind2014 you want what?
@Chrono79 Well thanks for the good feedback!
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:+1:
What do you think of my next one
function repeatStringNumTimes(str, num) {
// repeat after me
var longstr = "";
while (num > 0) {
num--;
longstr += str;
}
return longstr;
}
repeatStringNumTimes("abc", 3);
@Lanceward410 looks ok
there is more than one way of solving the challenges, but that one is fine
Yeah, for a couple I had to look up help and I found a detailed outline of multiple solutions for each... After reading that, I understood the syntax and mindset I need much better. It's been tremendously easier for me to think of solutions since I looked up those answers
@Lanceward410 it's unconventional but it works
But try to figure it out yourself before looking up solutions
@LifuTao Don't worry my keen eye for detail makes that learning style very worthwhile... How could I make my last code more simple?
var longStr="";
for(var i=0;i<num;i++)
{
longStr+=str;
}
return longStr;
@Lanceward410 , as of now using a while loop for this is good, but I think learning your way around the for loop will really benefit you as you deal with more complex situations
@LifuTao You always write without spaces between code ? It's harder to read that way mate
I think the while method is simpler :D
I'm on the "Finding the Longest Word in a String" challenge, can anyone help me out?
@EricHasegawa Use a for loop to check/compare each word's length
@Stuhl yeah I always write without spaces, in my C++ class the teacher said it was up to us to space or not
@Lanceward410 Okay I'll try that
@LifuTao Yeah but honestly it looks better with some space, because it creates less visual noise
Especially the for loop is a bit hard to look at and in more complex code, it would be messy to maintain and understand
Especially the for loop is a bit hard to look at and in more complex code, it would be messy to maintain and understand
Now if someone writes code without ever hitting Enter.... THAT is messy
@Stuhl I see what you're saying
Question for the room....I'm finding that progressing through the levels is not "fixing" the core JS concepts in my mind. I think I need to undertake more exercises at each level in order to better build the muscle memory. My thinking is that, in the same way a musician practices basic scales over and over each day, I can do the same with JS. Does anyone have a good resource of this kind?
@Lanceward410
Now if someone writes code without ever hitting Enter.... THAT is messy
it's called minified I think
@rollinsons w3school, they have exercises
@rollinsons https://www.w3schools.com/js/js_string_methods.asp has just about every bit of knowledge there is to know about beginner code. It has a "try it yourself" for every single method, and even if you don't use that, just the pure exposure to all of the content every time you go searching for something helps me learn more
Hi All, I'm doing the Profile lookup, and I'm getting a warning about an infinite loop. Any suggestions?
@rollinsons if you want to read more, there's also MDN
//Setup
var contacts = [
{
"firstName": "Akira",
"lastName": "Laine",
"number": "0543236543",
"likes": ["Pizza", "Coding", "Brownie Points"]
},
{
"firstName": "Harry",
"lastName": "Potter",
"number": "0994372684",
"likes": ["Hogwarts", "Magic", "Hagrid"]
},
{
"firstName": "Sherlock",
"lastName": "Holmes",
"number": "0487345643",
"likes": ["Intriguing Cases", "Violin"]
},
{
"firstName": "Kristian",
"lastName": "Vos",
"number": "unknown",
"likes": ["Javascript", "Gaming", "Foxes"]
}
];
function lookUpProfile(firstName, prop){
// Only change code below this line
var i = 0;
while(i < contacts.length) {
if (firstName == contacts.firstName) {
if (prop == contacts.hasOwnProperty(prop)) {
return contacts[prop];
} else if (prop != contacts.hasOwnProperty(prop)) {
return "No such property";
} else if (firstName != contacts.firstName) {
return "No such contact";
}
}
}
// Only change code above this line
}
// Change these values to test your function
lookUpProfile("Akira", "likes");
@emorgan05 where are you using i? contacts is an array
Thanks @longnt80 @Lanceward410 , I'll check out W3.
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I was using i in the while statement to say, only if we have stuff left in the array
Hello
javascript is keep printing the value instead of changing the previous one
does any body know what's the solution for it ?
javascript is keep printing the value instead of changing the previous one
does any body know what's the solution for it ?
@emorgan05 to access a single contact you should use i
hasOwnProperty returns a boolean value
contacts[i] <- like thathasOwnProperty returns a boolean value
@Dhrumit14 show your code
@Chrono79 Right, but I was trying to cycle through the list of contacts and stop when I finish the list. That's why I put while i < array.length
@emorgan05 your code does the same each loop if you don't use i inside
@Chrono79
$(document).ready(function() {
function codeAddress() {
var changeTemp = document.getElementById("CtoF").innerHTML;
console.log(changeTemp);
window.onload = codeAddress;
$("#CtoF").on("click", function() {
if (changeTemp === "℃") {
changeTemp = "℉";
} else {
changeTemp = "℃";
}
document.getElementById("CtoF").innerHTML = changeTemp;
console.log(changeTemp);
});
}
var cityName = $("#weatherSearch").val();
var key = "d1533e8cd0767e04eca3f7b99ffe166a";
$("#weatherMe").on("click", function() {
console.log(cityName);
$.getJSON('http://api.openweathermap.org/data/2.5/weather?' + '&q=' + cityName + '&APPID=' + key, function(json) {
var TempInKelvin = json.main.temp;
console.log(TempInKelvin);
var Pressure = json.main.pressure;
console.log(Pressure);
var Humadity = json.main.humidity;
console.log(Humadity);
var MinTempInKelvin = json.main.temp_min;
console.log(MinTempInKelvin);
var MaxTempInKelvin = json.main.temp_max;
console.log(MaxTempInKelvin);
// var Condition = [];
var Condition = json.weather[0].description;
console.log(Condition);
var image = new Image();
image.src = "Temp.jpg";
image.height = 100;
image.width = 100;
if (TempInKelvin === '') {
TempInKelvin = 'unknown';
} else if (changeTemp === "℃") {
var TemInCelcius = TempInKelvin - 273.15;
$(".temp").append(image, +TemInCelcius + "℃");
} else {
var TempInFahrenheit = ((9 / 5) * (TempInKelvin - 273) + 32);
$(".temp").append(image, +TempInFahrenheit + "℉");
}
});
});});
@Lanceward410 I'm still quite lost, can you help?
@Chrono79
Plesae consider this one
$(document).ready(function() {
var changeTemp = document.getElementById("CtoF").innerHTML;
console.log(changeTemp);
window.onload = codeAddress;
$("#CtoF").on("click", function() {
if (changeTemp === "℃") {
changeTemp = "℉";
} else {
changeTemp = "℃";
}
document.getElementById("CtoF").innerHTML = changeTemp;
console.log(changeTemp);
});
var cityName = $("#weatherSearch").val();
var key = "d1533e8cd0767e04eca3f7b99ffe166a";
$("#weatherMe").on("click", function() {
console.log(cityName);
$.getJSON('http://api.openweathermap.org/data/2.5/weather?' + '&q=' + cityName + '&APPID=' + key, function(json) {
var TempInKelvin = json.main.temp;
console.log(TempInKelvin);
var Pressure = json.main.pressure;
console.log(Pressure);
var Humadity = json.main.humidity;
console.log(Humadity);
var MinTempInKelvin = json.main.temp_min;
console.log(MinTempInKelvin);
var MaxTempInKelvin = json.main.temp_max;
console.log(MaxTempInKelvin);
// var Condition = [];
var Condition = json.weather[0].description;
console.log(Condition);
var image = new Image();
image.src = "Temp.jpg";
image.height = 100;
image.width = 100;
if (TempInKelvin === '') {
TempInKelvin = 'unknown';
} else if (changeTemp === "℃") {
var TemInCelcius = TempInKelvin - 273.15;
$(".temp").append(image, +TemInCelcius + "℃");
} else {
var TempInFahrenheit = ((9 / 5) * (TempInKelvin - 273) + 32);
$(".temp").append(image, +TempInFahrenheit + "℉");
}
});
});});
@EricHasegawa Establish a variable "longestword" equal to 0.
@Lanceward410 Okay done
@EricHasegawa Use your loop to check whether each word in your string is longer than longestWord. If it is larger, then longestWord should change.
@Lanceward410 How do I set that up
@Dhrumit14 are you using codepen?, if so, paste the link
@EricHasegawa You will probably use this for many later applications, so I'll tell you this:
.split(" ") will break your string up into an array of words. I can't really give you the answer, but that is a basic outline of a solution
@Lanceward410 I know that I'll have to use that in here, I just don't know how
@EricHasegawa If you store your split up array in another variable (maybe call it "arr") It may make it easier to work with
arr[0] is the first word in the string. arr[1] is the second word. You will replace this with arr[i] in your for loop to indicate that your code is going to run on each word in the array one by one.
@Lanceward410 Here's my code so far
function findLongestWord(str) {
var splitString = str.split(' ');
var longestWord = 0;
for ( i=0; i <= splitString.length; i++ )
if (splitString.length > longestWord) {
return splitString.length;
} else { return longestWord;
}
}
findLongestWord("The quick brown fox jumped over the lazy dog");
@rollinsons www.codewars.com/r/jpGUGQ
@EricHasegawa In your for loop parameters, make i less than (<) not Less than/equal to (<=). This is because the array starts at 0, and if you account for that then the last item in your array will technically be @ position (array.length - 1)
@EricHasegawa And since you want the for loop to SAVE the value of the longest word, not simply return any one value, you should use a different method inside your if/else statement
@Lanceward410 What do you mean?
@EricHasegawa or just do for(i=0;i<splitString.length;i++)
thats what i do
@EricHasegawa So if splitArray[i] is greater than longestWord, you want longestWord to change. So you could assign it like this:
longestWord = splitArray[i];
@Lanceward410 What would splitArray be in my current code
Then when the for loop is finished running, your variable "longestWord" should hold a value equal to the longest word in the array
wait I mean
splitString[i].length, I'm sorry
@LifuTao
Not splitArray[i]
@LifuTao For each click it's printing separate result instead of updating the previous one
@Lanceward410 My code still isn't working at all,
@Dhrumit14 that's because you used append
@Lanceward410
'''
:bulb: to format code use backticks! ``` more info
@Chrono79 What should I use instead of append
@Lanceward410
html?
shift+enter
@Dhrumit14 I completed the project you completed, I'll link it and you I'll explain it
function findLongestWord(str) {
var splitString = str.split(' ');
var longestWord = 0;
for ( i=0; i < splitString.length; i++ ) {
if (splitString[i].length > longestWord) {
splitString[i] = longestWord;
} else {
return longestWord;
}
}
}
findLongestWord("The quick brown fox jumped over the lazy dog");function findLongestWord(str) {
var splitString = str.split(' ');
var longestWord = 0;
for ( i=0; i < splitString.length; i++ ) {
if (splitString[i].length > longestWord) {
splitString[i] = longestWord;
} else {
return longestWord;
}
}
}
findLongestWord("The quick brown fox jumped over the lazy dog");
@Lanceward410 My bad hahah I was having trouble formatting the code
@Chrono79 : I tried it
@EricHasegawa you didn't declare i as a variable
@EricHasegawa YOu need to update longest word (which means longestWord = ?
Also, your retrun should be after the loop
Also, your retrun should be after the loop
@Dhrumit14 and?
it din work
@LifuTao oh okay
link to your codepen
I am not using codepen
@EricHasegawa So there's a problem. Within the if statement, you are setting a word equal to a number. You want to be setting that number equal to the length of that word
$(".temp").html(image, +TemInCelcius + "℃"); @Chrono79
then do it, it's easier to see what your code does
@EricHasegawa The order that you place the variables in counts. You are very close to the answer
@Lanceward410 I'm not sure how to get it working
@EricHasegawa Only in special circumstances do you want to return inside a loop.
@EricHasegawa
splitString[i] = longestWord;
should be
longestWord = splitString[i].length;
splitString[i] = longestWord;
should be
longestWord = splitString[i].length;
This is not one of them.
splitString[i].length *
@Lanceward410 THanks
@revisualize :)
$("#inCelsius").click(function(){
$("#temperature").html(tempInCelsius+"°C");
});
Ive been on this bus for an hour. This sucks.
@sjames1958gm I'm not sure how else I'd set it up
I am 25min away via bike.
5 miles.
@Lanceward410 I really don't know how to progress
Grrrrr....
So I had a button with the id #inCelsius and on click of the button, the id element inside of the button "temperature" 's HTML changes
@EricHasegawa What don't you understand from the last couple messages specifically? I can help clear it up
@LifuTao @Chrono79 : If I use .html than I'm not getting image
$(".temp").html(image + TempInFahrenheit + "℉");
@Lanceward410 I don't know what order to place my variables in, or where my return should be, or why the code isn't working in general
Thanks @pahosler , I have signed up for that site, very helpful :)
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@EricHasegawa Okay so, when assigning variables, you always put the variable you are changing first. So when I set x equal to 2, I write
x = 2 . Do NOT write 2 = x
I enjoy it :D
@Lanceward410 Okay I fixed that
@Dhrumit14 so if you want the image you have to change the href (link ) of it using $(#element).attr(src,"link")
@EricHasegawa The return method ends a function and returns it to the beginning. Your code will execute in the order that you type it in. If you want to use a FOR LOOP to find the longest word, then RETURN thte longest word, you must place the RETURN on the OUTSIDE of the for loop.
html just basically changes the wording
@Lanceward410
function findLongestWord(str) {
var longestWord = 0;
var splitString = str.split(' ');
for ( i=0; i < splitString.length; i++ ) {
if (splitString[i].length > longestWord.length) {
longestWord = splitString[i].length;
}
}
return longestWord;
}
findLongestWord("The quick brown fox jumped over the lazy dog");
Now my if statement seems wrong
Hi
@EricHasegawa longestWord is a number, don't use .length
@EricHasegawa Lool yes. So, longestWord is already a number
I'm trying to dynamically adjust my
href on a <a> tag but i get the following error
Unsafe JavaScript attempt to initiate navigation for frame with URL 'https://www.wikipedia.org/' from frame with URL 'https://s.codepen.io/boomerang/iFrameKey-8327d59c-11ad-7f21-c76a-6604a4156689/index.html?editors=1011'. The frame attempting navigation is sandboxed and is trying to navigate a popup, but is not the popup's opener and is not set to propagate sandboxing to popups.
@Lanceward410 @sjames1958gm Hahaha that was dumb of me, thank you guys for the help it's working now!
erichasegawa sends brownie points to @lanceward410 and @sjames1958gm :sparkles: :thumbsup: :sparkles:
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Does anyone know what this means?. I tried googling it but I dont quite understand the stack overflow answers
@EricHasegawa :+1:
@apravink It has to do with navigation from inside an iframe. You need to open a new window when doing that using.
You need
It is a security mechism
You need
target="_blank" in your <a>It is a security mechism
Thanks @sjames1958gm
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@apravink you're welcome
@EricHasegawa It is all this difficulty that helps us learn best. There are thousands of potential errors to make while coding, but rest assured knowing that you usually won't make the same one multiple times. This is the magic of compounded learning.
var count = 0;
function cc(card) {
// Only change code below this line
switch (card){
case 2:
case 3:
case 4:
case 5:
case 6:
count ++;
break;
case 10:
case 'J':
case "Q":
case 'K':
case 'A':
count --;
break;
}
if (count > 0 ){
return count +"Bet";
}else {
return count +"Hold";
}
what am i missing
@Duffy125 the return function ENDS your code. You want it to keep running after the count is increased or decreased.
wait
I need help...
I can't get the golf code...
I read your code all wrong nevermind.
anyone can help me? how do i rename multiple files in a folder to their modified date but minus 5 minutes?
‛‛‛ function golfScore(par, strokes) {
// Only change code below this line
return "Change Me";
// Only change code above this line
}
// Change these values to test
golfScore(5, 4); ‛‛‛
I have a felling its something with return but i cant point it out
Is there someone available to review my code for "Symmetric Difference". It isn't working as intended.
@sjames1958gm Now I have a new error :I
Mixed Content: The page at 'https://codepen.io/abhiwan/pen/VWaXNv?editors=1011' was loaded over HTTPS, but requested an insecure resource 'http://en.wikipedia.org/?callback=?&curid=45692901'. This request has been blocked; the content must be served over HTTPS.
anyone can help me? how do i rename multiple files in a folder to their modified date but minus 5 minutes?
@apravink Change your http to https
@sjames1958gm Cant believe i didnt try that!. Thanks!!
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@Duffy125 Oo! yes it is
@mackyking This challenge is a series of if / else if/ else if comparing strokes to par per the table (special case is strokes === 1)
@Duffy125 So by returning
count + "bet"; Your final answer would come out as "5bet". You want to make it so there's a space in between the count and the decision.
@Duffy125 Your output looks like 5Bet when it should be 5 Bet
@Duffy125 you need a space between count and the string
And in the code you pasted it, it's missing a } at the end
And in the code you pasted it, it's missing a } at the end
Can you give me the correct syntax for this golf code? Please...
Thanks @sjames1958gm
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@mackyking
if (condition) {
return "String";
} else if (condition) {
}where the conditions are the comparisons of strokes to par.
Return the appropriate "String"
So I did all that still not passing
like 10 of my eyelashes just fell out
var count = 0;
function cc(card) {
// Only change code below this line
switch (card){
case 2:
case 3:
case 4:
case 5:
case 6:
count ++;
break;
case 10:
case 'J':
case 'Q':
case 'K':
case 'A':
count --;
break;
}
if (count > 0 ){
return count + "Bet";
}else {
return count + "Hold";
}
// Only change code above this line
}
// Add/remove calls to test your function.
// Note: Only the last will display
cc(2); cc(3); cc(7); cc('K'); cc('A');
@Duffy125 Add the space INSIDE of the
"Bet" and "Hold" quotes. It's very case sensitive and only what is within the quotes will be returned in the string
e.g.
"Hello" + " " + "World" equals "Hello World"
yeah I though you meet of the + not the "
Unless I'm just blind and you already have them
Does it work after that?
I am working on the Weather challenge, and am trying to send a request to the darksky API, but nothing shows up on my screen, and my console shows this error: Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://api.darksky.net/forecast/37b20e267924f791637d860e18fb91b1/30.332184,-81.655647. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing). How do I allow the request so that I can do what I need? I use Firefox for my browser, but Chrome shows the same error.
yes that was a pass. thank you. hope your your eyes are not dead
@fmccroy have you tried using https://crossorigin.me/ then your url?
Sweet, that means they're still good for another day.
@thekholm80 After Googling the problem, that was never mentioned. Will I need the extra URL every time I try to use an API?
not every time, just often when using APIs in codepen
every api has their own Access-Control-Allow-Origin policy
Would it work better in a different editor, like Brackets, or it’s caused by the API itself?
the problem is the request originates in your browser, then gets forwarded through codepen on to the api
so the end points don't match
unless I completely misunderstand the process, anyway
That sucks.. so somewhere one of the sites thinks there is a security issue. The link you gave made my code work, thanks!
:+1:
err.. thanks @thekholm80. Can’t forget the brownie points :)
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if it makes you feel better, when I make api calls from one port on my computer to another I have to allow cross origin requests lol
@fmccroy Are you using jquery?
Is there something you can add to your code to do that, or you have to use the other site as well?
@sjames1958gm Yes, using Jquery.
@fmccroy You can use a mechanism called JSONP which circumvents CORS, if the API supports it.
Add
Add
&callback=? to your URL
i can allow it in my web server settings @fmccroy
@fmccroy It is the server that sets the header that your browser checks before accepting the API response.
Stuck on the "Stand in Line" test in Javascript path. Anyone else get stuck here?
@ottocedeno
You should be using your two parameter arr, item in the function.
You can show your code.
You should be using your two parameter arr, item in the function.
You can show your code.
function nextInLine(arr, item) {
arr.push(item);
arr.shift(0);// Your code here
return item; // Change this line
}
// Test Setup
var testArr = [1,2,3,4,5];
// Display Code
console.log("Before: " + JSON.stringify(testArr));
console.log(nextInLine(testArr, 1)); // Modify this line to test
console.log("After: " + JSON.stringify(testArr));
stuck on the part where it asks "return the element that was removed"
@ottocedeno Close - arr.shift returns the value that was removed - you need to return that value.
var contacts = [
{
"firstName": "Akira",
"lastName": "Laine",
"number": "0543236543",
"likes": ["Pizza", "Coding", "Brownie Points"]
},
{
"firstName": "Harry",
"lastName": "Potter",
"number": "0994372684",
"likes": ["Hogwarts", "Magic", "Hagrid"]
},
{
"firstName": "Sherlock",
"lastName": "Holmes",
"number": "0487345643",
"likes": ["Intriguing Cases", "Violin"]
},
{
"firstName": "Kristian",
"lastName": "Vos",
"number": "unknown",
"likes": ["Javascript", "Gaming", "Foxes"]
}
];
function lookUpProfile(firstName, prop){
// Only change code below this line
}
}
}
// Only change code above this line
// Change these values to test your function
lookUpProfile("Akira", "likes");
should I use For loop for this ?
pls help me
@ottocedeno
You can assign the return from arr.shift() to item since you return item
arr.shift(0);// Your code here
return item; // Change this lineor replace the above with
return arr.shift();
@mthinh yes
@sjames1958gm so the "return arr.shift()" should replace my current return
@mthinh Yes, a for loop is needed so you can check each contact in the array per the instructions
@ottocedeno shift doesn't use arguments, it will ignore what you put inside the parentheses
@ottocedeno Yes, but you need to only have one arr.shift(), so if you do remove the other
Ah got it. so putting the arr.shift() in return serves two fold, 1) doing the actual shift part, but then 2) returning the value that was shifted out.
very tricky lesson. Probably the hardest one yet.
@sjames1958gm what value should i put in this open and clos parenthesis? if (what condition?) {
return "String";
} else if (condition) {
}
return "String";
} else if (condition) {
}
'code' var test = "test ": 'code'
var contacts = [
{
"firstName": "Akira",
"lastName": "Laine",
"number": "0543236543",
"likes": ["Pizza", "Coding", "Brownie Points"]
},
{
"firstName": "Harry",
"lastName": "Potter",
"number": "0994372684",
"likes": ["Hogwarts", "Magic", "Hagrid"]
},
{
"firstName": "Sherlock",
"lastName": "Holmes",
"number": "0487345643",
"likes": ["Intriguing Cases", "Violin"]
},
{
"firstName": "Kristian",
"lastName": "Vos",
"number": "unknown",
"likes": ["Javascript", "Gaming", "Foxes"]
}
];
function lookUpProfile(firstName, prop){
// Only change code below this line
for(var i =0; i < contacts.length; i++){
if(contacts[i]["firstName"] === firstName && contacts[i][prop] === true){
console.log(contacts[i][prop]);
}else if(contacts[i]["firstName"] === firstName && contacts[i][prop]=== false ){
console.log('No such property');
}else{
console.log('No such contact');
}
}
}
// Only change code above this line
// Change these values to test your function
lookUpProfile("Akira", "likes");
what did I do wrong ?
@mthinh
Your function should return instead of console.log and think about when you can return No such contact
contacts[i][prop] === true <- that's wrongYour function should return instead of console.log and think about when you can return No such contact
@Chrono79 what i have to deal with that ?
@mthinh use hasOwnProperty
#252 Caesars Cipher
In String.fromCharCode(num1[, ...[, numN]]), all these numbers can be in an array? Will it return same?
Or do I need to store it in by for loop for each array element and join('')?
var code_old=[]; //Storing old alphabet codes in code_old
for (var i=0; i < str.length; i++) {
code_old[i]=str.charCodeAt(i);
} //Changing ONLY alphabets code by reducing 13 else unchanged
for (i=0;i<str.length;i++){
if(code_old[i] > 64 && code_old[i] < 92)
code_old[i] -= 13;
else
code_old[i] -= 0;
}
var str2;
return str2.fromCharCode(code_old);
//var arr;
//var a;
//for (i=0;i<str.length;i++){
//a=str2.fromCharCode(code_old.shift());
//arr.push(str2.fromCharCode(code_old.shift()));
//}
//return arr.join('');
// return newstr;
}
// Change the inputs below to test
rot13("SERR PBQR PNZC");
@Chrono79 thank you very much
mthinh sends brownie points to @chrono79 :sparkles: :thumbsup: :sparkles:
:star2: 4294 | @chrono79 |http://www.freecodecamp.com/chrono79
@piyush805 you could use spread operator, an array won't work, unless you use map or something like that
@Chrono79 Store in spread operator and join?
no
var arr = [1, 2, 3];
console.log(...arr); // 1, 2, 3
You can use
String.fromCharCode(...arr);
Note it's String, the class, not any string
@Chrono79 It says 'spread/rest operator' is only available in ES6(use 'esversion 6').
@piyush805 then write
'esversion: 6'; at the top
@Chrono79 It still has warning on it, but at least it is giving some output.
@piyush805 you can solve it with only one loop, why don't you replace each letter with its decoded version?
@sjames1958gm what value should i put in this open and clos parenthesis? if (what condition?) {
return "String";
} else if (condition) {
}
return "String";
} else if (condition) {
}
var reg=/[&<>"']/gi;
var re={"&":"&",
"<":"<",
">":">",
"\"":""",
"\'":"'"
};
return str.replace(reg,re[reg]);
what is wrong with this code
@Chrono79 Letters with code<13 are problem as of now
@piyush805 rethink what you have to do, if the charcode is 65 and you subtract 13 the new code will fall outside of the capital letters range
@cmccormack are you there ?
@Chrono79 yeah
@forwebtech hey can you check what is wrong with my code
@fillopfy sure ? where is your code ?
var reg=/[&<>"']/gi;
var re={"&":"&",
"<":"<",
">":">",
"\"":""",
"\'":"'"
};
return str.replace(reg,re[reg]);
@fillopfy i think
re[reg] that's the problem. wait let me run it.
@Chrono79 function lookUpProfile(firstName, prop){
// Only change code below this line
for(var i =0; i < contacts.length; i++){
if(contacts[i]["firstName"]=== firstName){
if(contacts[i].hasOwnProperty(prop)){
return contacts[i][prop];
}else{
return 'No such property';
}
} else{
return 'No such contact';
}
}
}
what i miss here? i only do right 2 case
@forwebtech but logically, it should replace it
@fillopfy well but
reg is your regex not the property name :)
@mthinh why are you returning No such contact at the first mismatch?
Your loop won't run more than once like that
Your loop won't run more than once like that
@fillopfy put the callback method at the
replace( ... , (match)=>{
console.log(match);
})try to do that
@forwebtech but after searching for reg in str, the value of reg should go inside re and it should return its equivalent prop
@forwebtech i didnt understand this arrow marks, what is it
it's a lighweight version of something like RxJS
@fillopfy or
replace( ... , function(match) {
console.log(match);
})
@fillopfy
=> that is a arrow function, ES6 syntax, forget it stick with older one :)
@fillopfy you can use the
match as your property name.
@forwebtech ok let me try doing that challenge
@Chrono79 where you I return 'no such contact' ?
where should I ?
@sjames1958gm what value should i put in this open and clos parenthesis? if (what condition?) {
return "String";
} else if (condition) {
}
return "String";
} else if (condition) {
}
@mthinh When you didn't find a matching contact in the whole list
@mackyking compare strokes against the first column in the table and return the string at the second column
Hey.
@Chrono79 Sample syntax line please...
if (strokes == someValue) {
return "someString";
} else if ...
@Chrono79 thanks
piyush805 sends brownie points to @chrono79 :sparkles: :thumbsup: :sparkles:
:star2: 4295 | @chrono79 |http://www.freecodecamp.com/chrono79
@Chrono79 sorry , but i still dont know where to put return 'No such contact' : (
function lookUpProfile(firstName, prop){
// Only change code below this line
for(var i =0; i < contacts.length; i++){
if(contacts[i]["firstName"]== firstName){
if(contacts[i].hasOwnProperty(prop)){
return contacts[i][prop];
}else{
return 'No such property';
}
}
} }
@mthinh you're only sure it wasn't in the contact list after you looked over all contacts (and didn't find it), and in the code, that is after the loop
Can someone explain to me what they are asking for in "Accessing Objects Properties with Variables"?
@Chrono79 thank you , i finally understand :D
mthinh sends brownie points to @chrono79 :sparkles: :thumbsup: :sparkles:
:warning: mthinh already gave chrono79 points
stuck with counting cards problem , any suggestions ? posting my code
@meslance see the checkmarks it's not so hard
playerNumber should contain a number, the number that has "Montana" as a value in testObj
Then use that var between brackets to get "Montana" from your object
playerNumber should contain a number, the number that has "Montana" as a value in testObj
Then use that var between brackets to get "Montana" from your object
@Chrono79 do you try codewars ?
@forwebtech yes I do, I did (solved) a lot of katas
so Decode the Morse code, advanced ? done that
@forwebtech Let me see
@Chrono79 Yeah probably. Brain is just fried from today I guess.
@forwebtech Yes, I did that
@Chrono79 well i have solved it, how should i share ? i don't see any links of my solution ?
hey guyswha ts up
@Chrono79 https://www.codewars.com/kata/54b72c16cd7f5154e9000457/solutions/javascript/all/newest check there.
@Chrono79 Go comment about how awesome my idea is: freeCodeCamp/freeCodeCamp#15388
it seems as though i did one of the sections correctly but its not working for some reason
var value = 1;
function factorialize(num) {
if(num<1){
return value;
}else{
for(i=num; i>0; i--){
num = value *=i;
}
return num;
}
}
factorialize(0);
@revisualize great idea :+1:
@heidisdad2 Global variables are NOT reset between the test runs.
what do you mean? my code works
value should be inside of your function.
but @revisualize did you read that :
Hi @revisualize
The issue tracker is for reporting bugs only. If this is a request for help with a challenge, please use the help chat room or try looking through the forum for help with a specific challenge.
If this is the case, please close this issue.
Happy Coding.
@forwebtech That's some dumb automated bullship.
@revisualize let me give that a shot.. but i passed all the tests
@revisualize The bot didn't like it :P
@revisualize but that is for issues, not for instructions.
@Chrono79 did you check my solution ?
@forwebtech not yet
@revisualize yes you were correct i moved the variable and it let me pass.. but when i was doing the test before i tried it your way all the tests were passed.
HI friends can anyone help me with the truncate a string challenge? I've got the first two tests to pass but can't get the last 4 to pass.
function truncateString(str, num) {
// Clear out that junk in your trunk
if (str.length >= num) {
str = str.substring(0, num-3);
return str + "...";
}
else {
return false;
}
}
truncateString("A-tisket a-tasket A green and yellow basket", "A-tisket a-tasket A green and yellow basket".length);
my code ^ :D
@Chrono79 ok, when you will have time, then check it if any refactoring possible.
just looking for direction if anyone can help, not an answer
@forwebtech At this hour I can't even look at my own code ;)
But I promise I'll check yours some other time
@Chrono79 thanks, and np !
forwebtech sends brownie points to @chrono79 :sparkles: :thumbsup: :sparkles:
:star2: 4296 | @chrono79 |http://www.freecodecamp.com/chrono79
@pursuitgit shouldn't you check if num <= 3 somewhere?
@chrono so I should do an elseif?
and why are you returning false?
@Chrono79 It was just for testing purposes till I could figure it out >.< not sure if that's bad practice or not
Read the instructions carefully again, 50% of the challenge is to understand what to do
Ok I'll have a dig
:+1:
some nested if could be useful there
@revisualize I agree a lot of people don't understand how to use a function, but I think maybe reordering some challenges, for instance, Passing Values to Functions with Arguments before Converting Celsius to Fahrenheit would help
@Chrono79 that's why we're at freecodecamp!
I could create a video about the whole thing. But, I don't know if that's warrented.
Maybe a related challenges part would help too
People do the array manipulation challenges and then when they reach Stand in Line have no clue on what to do
The same with Word Blanks
@pursuitgit I'm just discussing how FCC could improve its map
Well, hopefully, my issue gets addressed somehow.
I think the entire freecodecamp system is open source
if your up to the challenge do a PR
:)
It is.
I'm not.
Did you check the beta @revisualize ?
I did.
Have they improved something there?
Nope.
There are not any additional Basic lessons about functions.
Not even an order change?
How can I select a block of code and comment it with a command??
@nsuchy I don't know how to make a pull request nor do I have the time to craft up a whole series of lessons.
@Chrono79 There's a little bit of an order change but, not much.
@revisualize That’s the fastest way to get a feature
to implement it yourself of couse that’s not always practical
you could add an issue and see if their team is up to making a change
Here it won't exit directly after stdin.end(), does that mean that anything inside is a readable stream, and it won't end unless the readable stream ends ?
process.stdin.on('data', function(chunk) {
let input = Buffer.from(chunk).toString().replace(/[\r\n]/g, '');
console.log(chunk);
if(input === 'exit') {
process.stdin.end();
setTimeout(function() {
}, 2000);
}
});
@nsuchy You don't realize that we're discussing the issue that I created?
freeCodeCamp/freeCodeCamp#15388
Was just providing suggestions but thanks for the link
That's the issue that I created about 30min ago.
I’ll look over it tomrrow
Anyhow. It's 9pm here. I'm actually tired.
It’s midnight here
I’ll be back tomorrow morning
goodnight everyone
I think I'm going to call it an early one.
function checkObj(checkProp) {
// Your Code Here
var myObj={
gift: "pony",
pet: "kitten",
bed: "sleigh",
};
if ( myObj.hasOwnProperty(myObj === true))
{return checkProp.myObj;
}else {
return "Not Found";
}}
// Your Code Here
var myObj={
gift: "pony",
pet: "kitten",
bed: "sleigh",
};
if ( myObj.hasOwnProperty(myObj === true))
{return checkProp.myObj;
}else {
return "Not Found";
}}
i feel there something wrong with my if
@Duffy125 yes
myObj === true that part is wrong
and
checkProp.myObj is wrong too (for 2 reasons)
if ( myObj.hasOwnProperty(checkProp === true))
See the example code again
ok
@Duffy125 better, but still wrong, watch out where you close your parentheses
Review this challenge too: https://www.freecodecamp.com/challenges/accessing-objects-properties-with-variables
:wave: 1am here, I'll call it a day
see ya
cool thanks
@Duffy125 did you solve it?
if (myObj.hasOwnProperty(checkProp)===true)
return val=myObj[checkProp];
else
return "Not Found";
return val=myObj[checkProp];
else
return "Not Found";
This code works
In "Using Objects for Lookups" I'm trying to figure out how to incorporate the "val" and "result" in the function. Why do we define result, then return result at the end? Thanks!
// Setup
function phoneticLookup(val) {
var result = "";
// Only change code below this line
var lookup = {
"alpha" : "Adams",
"bravo": "Boston",
"charlie": "Chicago",
"delta" : "Denver",
"echo" : "Easy",
"foxtrot" : "Frank",
};
// Only change code above this line
return result;
};
// Change this value to test
phoneticLookup("charlie");
You have to define result
if (myObj.hasOwnProperty(checkProp)===true)
return val=myObj[checkProp];
else
return "Not Found";
return val=myObj[checkProp];
else
return "Not Found";
why is it showing a small error even though the tests are passed
?
debug
can anyone help me on Profile Lookup exercise ?
any hints
im stuck with this one
The error is "did you mean to return a conditional instead of an assignment"
What does this mean?
The error relates to this line "return val=myObj[checkProp];"
@fdemaa post your code please
assign OR return .. dont do both on same line @OldmanVimes
for that code most probably u only need to return.... sooo remove
for that code most probably u only need to return.... sooo remove
val=
Hey guys quick question
Why am I getting an undefined here?
This is my code:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>JS Drum Kit</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div class="keys">
<div data-key="65" class="key">
<kbd>A</kbd>
<span class="sound">clap</span>
</div>
<div data-key="83" class="key">
<kbd>S</kbd>
<span class="sound">hihat</span>
</div>
<div data-key="68" class="key">
<kbd>D</kbd>
<span class="sound">kick</span>
</div>
<div data-key="70" class="key">
<kbd>F</kbd>
<span class="sound">openhat</span>
</div>
<div data-key="71" class="key">
<kbd>G</kbd>
<span class="sound">boom</span>
</div>
<div data-key="72" class="key">
<kbd>H</kbd>
<span class="sound">ride</span>
</div>
<div data-key="74" class="key">
<kbd>J</kbd>
<span class="sound">snare</span>
</div>
<div data-key="75" class="key">
<kbd>K</kbd>
<span class="sound">tom</span>
</div>
<div data-key="76" class="key">
<kbd>L</kbd>
<span class="sound">tink</span>
</div>
</div>
<audio data-key="65" src="sounds/clap.wav"></audio>
<audio data-key="83" src="sounds/hihat.wav"></audio>
<audio data-key="68" src="sounds/kick.wav"></audio>
<audio data-key="70" src="sounds/openhat.wav"></audio>
<audio data-key="71" src="sounds/boom.wav"></audio>
<audio data-key="72" src="sounds/ride.wav"></audio>
<audio data-key="74" src="sounds/snare.wav"></audio>
<audio data-key="75" src="sounds/tom.wav"></audio>
<audio data-key="76" src="sounds/tink.wav"></audio>
<script>
window.addEventListener('keydown', function(e) {
// const audio = document.querySelector(`audio[data-key=${e.keycode}]`)
console.log(e.keycode)
});
</script>
</body>
</html>
but when I press a key
@Betanya do u remember dot and bracket notation ? to access object values
it returns an undefined
is e itself undefined also
@MarioC3
no. because the event should be keydown
so when I press a key it should return the key code for whatever I pressed
javscript is case sensitive.. soo KEY is not the same as Key @MarioC3
check ur property name..
check ur property name..
if u not sure.. then... console.log(e)
and inspect console
and inspect console
i dont know how to use the loop to give me the correct values of my properties;
When i console.log that return for the loop, it gives me the value of the 4 properties of likes,
//Setup
var contacts = [
{
"firstName": "Akira",
"lastName": "Laine",
"number": "0543236543",
"likes": ["Pizza", "Coding", "Brownie Points"]
},
{
"firstName": "Harry",
"lastName": "Potter",
"number": "0994372684",
"likes": ["Hogwarts", "Magic", "Hagrid"]
},
{
"firstName": "Sherlock",
"lastName": "Holmes",
"number": "0487345643",
"likes": ["Intriguing Cases", "Violin"]
},
{
"firstName": "Kristian",
"lastName": "Vos",
"number": "unknown",
"likes": ["Javascript", "Gaming", "Foxes"]
}
];
function lookUpProfile(firstName, prop){
// Only change code below this line
for(i=0; i<contacts.length; i++){
return contacts[i][prop];
}
}
// Change these values to test your function
lookUpProfile("Akira", "likes");
@codersc
Yes. I checked my console and it returns undefined
@moigithub yes(hi again!), why?
@moigithub what are you talking about? check my code, I didn't put any KEY
if u not sure.. then... console.log(e)
and inspect console
thats an example of case sensitive variables names :) @MarioC3
When I console.log(e)
I received this:
anther example...
keyCODE is NOT the same as keycode neither keyCode
@MarioC3 it's should be
keyCode property not keycode
@fdemaa hold on let look u the lesson
up*
@Lumexralph Thanks!!!!!!
marioc3 sends brownie points to @lumexralph :sparkles: :thumbsup: :sparkles:
:star2: 1937 | @lumexralph |http://www.freecodecamp.com/lumexralph
So it was only a typo then?
@codersc i had to use the .hasownproperty also, but i dont know how, right?
okey !
okey !
@moigithub oh, wait I see what you are saying
@fdemaa
Here's an outline, if you follow it step-wise it'll help a great deal in telling you what to do or step you missed
Here's an outline, if you follow it step-wise it'll help a great deal in telling you what to do or step you missed
1. you need a loop to pick each objects in the contacts array
1.1 in the loop you need to
1.1.1 check if the objects picked has the firstName property equal to the firstName parameter
1.1.1.1 you need to check if it has a property prop
return the value of prop in the object
1.1.1.2 return no such property if 1.1.1.1 is false
2. when your loop is done looking through contacts return no such contact
@MarioC3 what @moigithub was correct
@Lumexralph thanks man!
fdemaa sends brownie points to @lumexralph :sparkles: :thumbsup: :sparkles:
:star2: 1938 | @lumexralph |http://www.freecodecamp.com/lumexralph
@MarioC3 you could have inspected the
e event object from your devTool console, then you'll come across the property you're trying to access
I understand. And I get the you have to 'figure it out' answer... but hahaha it was only a typo. I know, JS is case sensitive! Thanks
@MarioC3 you're welcome
@fdemaa :+1:
@fdemaa first just try to write some code that will loop through to check if the fiven first name is there and then we'll move on the rest
if the given*
do you know how?
nvm looks like you got it
i can't figure out how to code the temperature conversion
post your code @theironcock
which challenge is it?
@theironcock do you know the formula ?
@codersc thanks kevin , i will try it, and came back if i get stuck!
fdemaa sends brownie points to @codersc :sparkles: :thumbsup: :sparkles:
:cookie: 264 | @codersc |http://www.freecodecamp.com/codersc
yes i know i need to do celsius *9/5+32= farenheit. but each way i try i can't get it to actually work
@theironcock other way round
post your code @theironcock
@theironcock it's
fahrenheit
^ yup
var celsius = 30;
celsius*9/5+32= fahrenheit;
celsius*9/5+32= fahrenheit;
sorry i was trying few things.
did it work
no sadly
'''
:bulb: to format code use backticks! ``` more info
@theironcock
fahrenheit = celsius * 9 / 5 + 32;
post you code and click the more info for instructions on how to do that
more info link*
var celsius = 0;
fahrenheit = celsius*9/5+32;
this worked
fahrenheit = celsius*9/5+32;
this worked
Variable myStr should contain the string: I am a "double quoted" string inside "double quotes". need help in the output
@melen16 you need to escape double quotes in the string where it appeared
thank you.
@melen16 double quotes
\"
@Lumexralph var myStr = "I am a \"double quotes\" string inside \"double quotes\".";
doesnt work
@Lumexralph hey! how can i use the .hasownproperty to find out if my parameter props is a propertie?
@melen16 don't change the string given, only escape the qoutes there
@fdemaa
Object.hasOwnProperty(property);
@fdemaa
Object.hasOwnProperty(props) Object is the object you want to check
thanks
Help please with this code myStr = "FirstLine\n \SecondLine\ \rThirdLine";
@LerithaPride1 eliminate any space in between your string, have you escaped backslash
\\ ?
@moigithub I got it! :D Thanks!!
betanya sends brownie points to @moigithub :sparkles: :thumbsup: :sparkles:
:star2: 3371 | @moigithub |http://www.freecodecamp.com/moigithub
Awesome @Lumexralph, thanks!
lerithapride1 sends brownie points to @lumexralph :sparkles: :thumbsup: :sparkles:
:star2: 1939 | @lumexralph |http://www.freecodecamp.com/lumexralph
@codersc how so i get it so i can do all the return values at once so i can submit.
celsius = (-10);
celsius = (-30);
fahrenheit = celsius*9/5+32;
celsius = (-30);
fahrenheit = celsius*9/5+32;
convert celsius to fahrenheit
I am a "double quoted" string inside "double quotes".
still i couldnt find solution for this
can someone help me
in console it sows me the result and it same to me
@Lumexralph Morning.
@theironcock delete these lines
celsius = (-10);
celsius = (-30);
@melen16 your code?
@Lumexralph cant solve it . Variable myStr should contain the string: I am a "double quoted" string inside "double quotes". so then i did var myStr = " I am a \" double quoted \" string inside \" double quotes\" ";
@Manish-Giri cant solve it . Variable myStr should contain the string: I am a "double quoted" string inside "double quotes". so then i did var myStr = " I am a \" double quoted \" string inside \" double quotes\" ";
@melen16 I think there was a
. at the end there.
@Manish-Giri . yes and i didnt and it is the same .didnt solve
@melen16 post the challenge url
click run tests first
click run tests first
anyone can help me on this , idont know what im doing lol
//Setup
var contacts = [
{
"firstName": "Akira",
"lastName": "Laine",
"number": "0543236543",
"likes": ["Pizza", "Coding", "Brownie Points"]
},
{
"firstName": "Harry",
"lastName": "Potter",
"number": "0994372684",
"likes": ["Hogwarts", "Magic", "Hagrid"]
},
{
"firstName": "Sherlock",
"lastName": "Holmes",
"number": "0487345643",
"likes": ["Intriguing Cases", "Violin"]
},
{
"firstName": "Kristian",
"lastName": "Vos",
"number": "unknown",
"likes": ["Javascript", "Gaming", "Foxes"]
}
];
function lookUpProfile(firstName, prop){
// Only change code below this line
if("firstName"==firstName && (contacts).hasOwnProperty(prop)){
for(i=0; i<contacts.length; i++){
return contacts[i][prop];
}
}
}
// Change these values to test your function
lookUpProfile("Akira", "adress");
@melen16 why do you have spaces around the
\"
@fdemaa First you need to loop or iterate through the
contacts array.
Then test the looped contact.
@Manish-Giri after i removed it it is the same
@Masd925 thanks man , i will keep trying
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@melen16 that's why I asked you to post the FULL challenge url
what you post doesn't have your code
Escape Sequences in Strings
var myStr; // Change this line
var myStr = "First\tLine\n\"Second\tLine\"\rThird\tLine";
??? help
function spinalCase(str) {
// "It's such a fine line between stupid, and clever."
// --David St. Hubbins
return str.replace(/ |_|([a-z])([A-Z])/g, '$1-$2').toLowerCase();
}
spinalCase('AllThe-small Things');
@zayn1914 You don’t need extre quotes.
var myStr = "FirstLine\n\\SecondLine\\\rThirdLine";
@wonder2991
([a-z])([A-Z]) are capturing groups - $1 and $2 are the first and second captured values from your regex matches
@wonder2991 $1 means the first capturing group.
@wonder2991 Which is
([a-z])
alright
@wonder2991 https://mdn.io/RegExp#grouping-back-references
Thanks @cmccormack @ivancsicsmarkus
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@wonder2991 Good place to learn Regex: https://regexone.com/
@ivancsicsmarkus thanks :*
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can i follow u? @ivancsicsmarkus
guis
?
guys help
Sum All Odd Fibonacci Numbers
function sumFibs(num) {
serie = [1,1];
sum = 0;
stop = false;
counter = 1;
while ( !stop ){
if(num == 1 || num == 2){
serie = [1,1];
stop = true;
}else{
serie.push(serie[counter-1] + serie[counter]);
counter++;
console.log('num', num);
console.log('serie',serie);
if(num <= serie[serie.length-1]){ stop = true; }
}
}
return serie.reduce(
function(accumulator,acctualValue){
// si es par pasa solo el accumulator else suma accumulator y acctualValue
console.log("serie",serie);
return ( acctualValue%2 === 0 ) ? accumulator : accumulator + acctualValue;
},0);
}
sumFibs(4);
Sup, friends. Strugglin here, not sure how to tell these nested for loops to check for more than one value in each array.
'''
function multiplyAll(arr) {
var product = 1;
// Only change code below this line
for (var i = 0; i < arr.length; i++) {
for (var j = 0; j < arr[i].length; j++) {
product = product * arr[i]
}
}
// Only change code above this line
return product;
}
// Modify values below to test your code
multiplyAll([[1],[2],[3]]);
'''
:bulb: to format code use backticks! ``` more info
@AlejandrLara12 you're pushing numbers greater than num to your array before you check, this means your math will be incorrect
function sumFibs(num) {
serie = [1,1];
sum = 0;
stop = false;
counter = 1;
while ( !stop ){
if(num == 1 || num == 2){
serie = [1,1];
stop = true;
}else{
serie.push(serie[counter-1] + serie[counter]);
counter++;
console.log('num', num);
console.log('serie',serie);
if(num < (serie[serie.length-1] + serie[serie.length-2])){ stop = true; }
}
}
//return serie;
return serie.reduce(
function(accumulator,acctualValue){
// si es par pasa solo el accumulator else suma accumulator y acctualValue
console.log("serie",serie);
return ( acctualValue%2 === 0 ) ? accumulator : accumulator + acctualValue;
},0);
}
sumFibs(4);
That worked
@roshambembo do you mean
arr[j]?
@AlejandrLara12 all tests passed?
yeap
@AlejandrLara12 :clap:
is not my best code but it worked
is 1am here in mexico haha
@AlejandrLara12 you can always go back later and try a different implementation
thanks for the support tho @cmccormack
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@AlejandrLara12 np :D
@cmccormack you're right! I do mean
arr[j]
``
function reverseString(str) {
var array = str.split("");
var newArray = array.reverse();
var finalArray = newArray.join("");
return finalArray;
}
reverseString("hello");``
what are the better ways to do this?
can try to doing one liner
@poncatoera that is probably it
okay thanks @AlejandrLara12
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@cmccormack but I still need to multiply
product by each number in the array, even if there are sub-arrays. e. g. [[1, 2], [3, 4], [5, 6, 7]]
@zayn1914 ofc
need help with this https://www.freecodecamp.com/challenges/escaping-literal-quotes-in-strings
@roshambembo yup that should happen while your in your inner loop and multiplying the product times each number
@roshambembo is it not working?
@poncatoera here's a more complicated way to do it without reverse :D
'Hello, World!'.split('').map((v,i,a)=>a[-i+a.length-1]).join('')
@roshambembo you could try to use reduce, and also a for loop
so for each element of the main array, you reduce it, arr.reduce(funciton(accumilator,actualVal){ for loop }); @roshambembo
so in the for loop you ask for how many
like length of the sub array and you could also reduce it
function chunkArrayInGroups(arr, size) {
// Break it up.
var result = [];
return result;
}
chunkArrayInGroups(["a", "b", "c", "d"], 2);size interval?
@cmccormack nope. My understanding of what I've written is: the inner loop will multiply
product by the number in position j in the array, so long as j is less than the length of the sub-array at position i. my next step is to keep looping until it exhausts all the numbers in each sub-array, right?
@roshambembo yup your outer loop should iterate over the arrays, and your inner loop over the items
@roshambembo can you repost your code?
function multiplyAll(arr) {
var product = 1;
// Only change code below this line
for (var i = 0; i < arr.length; i++) {
for (var j = 0; j < arr[i].length; j++) {
product = product * arr[j];
}
}
// Only change code above this line
return product;
}
// Modify values below to test your code
multiplyAll([[1, 2],[3, 4],[5, 6, 7]]);
@cmccormack need help on this https://www.freecodecamp.com/challenges/escaping-literal-quotes-in-strings
@roshambembo
product = product*arr[i][j];
@melen16 what do you have so far?
@kpbro @roshambembo yup nice catch
hi, friends, i need some help, the result is right, but i can't pass this test. https://www.freecodecamp.com/challenges/no-repeats-please
why does my code show
TypeError: Cannot read property 'length' of undefined. my code:function largestOfFour(arr) {
// You can do this!
largestArr = [];
for (var i = 0; i <= arr.length; i++){
for (var j = 0; j<= arr[i].length; j++){
if (arr[i][j] < largestArr[i]){
largestArr[i] = arr[i][j];
}
}
}
return arr;
}
largestOfFour([[4, 5, 1, 3], [13, 27, 18, 26], [32, 35, 37, 39], [1000, 1001, 857, 1]]);
@HappyRedditor59 you used
<= on your loops - length is the number of items in the array, but array indexes start from 0
@cmccormack i have done all the steps and i dont know why it is not working
@HappyRedditor59 so if an array is length 10, you want 0-9
Hello All, need help. I am at Caesars Cipher challenge. Below is my code and i am getting the error 'TypeError: a.fromCharCode is not a function"
function rot13(str) { // LBH QVQ VG!
var arr = [];
console.log("@@ " + arr);
console.log(/^[a-zA-Z]+$/.test(str[0]));
for (i=0; i<str.length; i++) {
if (/^[a-zA-Z]+$/.test(str[i])) {
tmp = str.charCodeAt(i);
tmp += 13;
console.log("^^ " + tmp);
a = str[i];
console.log("~~ " + a);
arr.push(a.fromCharCode(tmp));
}
}
/* str = arr.join(" "); */
return str;
}
// Change the inputs below to test
rot13("SERR PBQR PNZC");
@kpbro aha! daisy-chaining the bracket notation tells me arr[positionWithinOuterArray][positionWithinSubArray]?
i did this for my factorial challenge
@melen16 you can paste your code here, and format it using the following rules:
```
Code goes here, backticks go on their own line. Previous posts can be edited. control + shift + m for detailed Markdown Help.
```
```
Code goes here, backticks go on their own line. Previous posts can be edited. control + shift + m for detailed Markdown Help.
```
@roshambembo You need a loop and produce a newArray with the slice function.
function factorialize(num) {
if (num === 0) {
return 1;
} else {
var array = [];
for ( var i = 1; i <= num; i++){
array.push(i);
}
answer = array.reduce(function (previousVal, currentVal) {
return previousVal * currentVal;
}); return answer;
}
}
factorialize(5);
@roshambembo post your code here
im pretty sure there is a better way to get factorial. anybody?
yours worked! just hoping to understand it better
@kpbro sorry, yours worked!
@roshambembo :thumbsup:
@cmccormack yes thank you that was a stupid mistake haha
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@HappyRedditor59 :thumbsup:
@kpbro @cmccormack thanks all!
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anyone can give me a better idea for factorial
function factorialize(num) {
if (num === 0) {
return 1;
} else {
var array = [];
for ( var i = 1; i <= num; i++){
array.push(i);
}
answer = array.reduce(function (previousVal, currentVal) {
return previousVal * currentVal;
}); return answer;
}
}
factorialize(5);
@VinayVijayJoshi
fromCharCode is a String method, call String.fromCharCode(tmp)
@poncatoera you just have to multiply a number with the same variable evrytime reducing number by one.... till it is 0
ohhhh
got it thank you @kpbro
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@poncatoera Instead of pushing numbers to an array and then reducing the array, just mutliply your answer(initialised to 1) with numbers from 1 till num.
@poncatoera try it :thumbsup:
@poncatoera you can do all the multiplication inside your loop. Just make a separate variable for the result. Another way to solve it is recursively.
@forkerino :wave:
@VinayVijayJoshi https://mdn.io/fromCharCode -
Because fromCharCode() is a static method of String, you always use it as String.fromCharCode(), rather than as a method of a String object you created.
@forkerino hey i need help with chunky monkey
How do i slice array at every given
size interval?
@poncatoera
function factorialize(num) {
var factorial = 1;
for (i = 1; i <= num ; i++) {
factorial *= i;
}
return factorial;
}
factorialize(5);No array needed
@cmccormack pulling an all nighter?
@cmccormack @cmccormack Thanks. I didnt realize that String was a keyword. This runs my code but my output is garbage, so need to work on it now. :+1:
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@forkerino nope about to hop off, just finishing up some stuff on my linux box that blew up the other night
@kpbro you need some loop
@VinayVijayJoshi np good luck
@cmccormack :+1:
thanks @JohnnyBizzel
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@forkerino i am using this for loop
for(var i=0;i<arr.length;i++)
Guess I'll hop off, have a good one!
@cmccormack sleep well
@forkerino thanks :D
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@kpbro Ok. there's two options:
- Increase i by size in the head of your loop and use it as arguments in the slice inside.
- Stop looping at arr.length/size and do some other calculations for the argumetns of slice.
@forkerino 1 looks better .. lemme try
Good night guys
can anybody help me out with javascript ?
i have to "Initialize the three variables a, b, and c with 5, 10, and "I am a" respectively so that they will not be undefined."
then i have here
var a = 5;
var b = 10;
var c = "i am a";
a = a + 1;
b = b + 5;
c = c + " String!";
but there's something wrong withc
"c should not contain undefined and should have a value of "I am a String!" "
@HiagoPatrick you changed your initialization variable for c
@HiagoPatrick "I am a " with capital I
sorry, i mean you needed to fix that that's the part you needed to write
:point_up:
Oh, really ? capital I lol, thanks
function chunkArrayInGroups(arr, size) {
// Break it up.
var result = [];
for(var i=0;i<arr.length;i+size){
var sliced = arr.slice(i,size);
result.push(sliced);
}
return result;
}
chunkArrayInGroups(["a", "b", "c", "d"], 2);
@forkerino says there is potential infinite loop
@kpbro use += instead of + when you increase i, otherwise i will remain 0
@forkerino any other mistake here?
@kpbro yeah, second argument of the slice is incorrect.
i should be in there somewhere
the 1st argument is where i need to start slicing and second is before which index i have to end slicing.. am i right?
@kpbro All your slices end in the same index.
yes
@Masd925 @forkerino I m confused which starting and ending index i have to use. Now i am using
i end index. but where to start?
@kpbro Start at
i and figure out where to end.
@kpbro use i for start, but where do you need to end if you start at i?
Can anyone explain what do the following lines do in the whole code?
Here is my thought about the above code. Can you tell me whether I get the point or not?
json.forEach(function(val) { //for each values in the json file
var keys = Object.keys(val); //keys is defined as the keys(id, imageLink, ...) in each values, where "values" is the stuff with { }
html += "<div class = 'cat'>";
keys.forEach(function(key) { //run a function with parameter "key" which is defined as the single items in "keys" (id, imageLink, ...)
html += "<strong>" + key + "</strong>: " + val[key] + "<br>";
});
html += "</div><br>";
});
Here is my thought about the above code. Can you tell me whether I get the point or not?
json.forEach(function(val) { //for each values in the json file
var keys = Object.keys(val); //keys is defined as the keys(id, imageLink, ...) in each values, where "values" is the stuff with { }
html += "<div class = 'cat'>";
keys.forEach(function(key) { //run a function with parameter "key" which is defined as the single items in "keys" (id, imageLink, ...)
html += "<strong>" + key + "</strong>: " + val[key] + "<br>";
});
html += "</div><br>";
});
Can anyone explain what do the following lines do in the whole code?
Here is my thought about the above code. Can you tell me whether I get the point or not?
Here is my thought about the above code. Can you tell me whether I get the point or not?
json.forEach(function(val) { //for each values in the json file
var keys = Object.keys(val); //keys is defined as the keys(id, imageLink, ...) in each values, where "values" is the stuff with { }
html += "<div class = 'cat'>";
keys.forEach(function(key) { //run a function with parameter "key" which is defined as the single items in "keys" (id, imageLink, ...)
html += "<strong>" + key + "</strong>: " + val[key] + "<br>";
});
html += "</div><br>";
});
@Masd925 @forkerino Thanks.. got it.. started at
i and ended at i+size
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@kpbro :+1:
@Masd925 Can you help me?
Here is my thought about the above code. Can you tell me whether I get the point or not?
json.forEach(function(val) { //for each values in the json file
var keys = Object.keys(val); //keys is defined as the keys(id, imageLink, ...) in each values, where "values" is the stuff with { }
html += "<div class = 'cat'>";
keys.forEach(function(key) { //run a function with parameter "key" which is defined as the single items in "keys" (id, imageLink, ...)
html += "<strong>" + key + "</strong>: " + val[key] + "<br>";
});
html += "</div><br>";
});
that's the real way to help without revealing the direct answer..
@ccs99817 You need to show the json encoded string too for that to make sense.
@Masd925 Actually, the whole code is as follow
$(document).ready(function() {
$("#newQuoteButton").on("click", function(){
//$("blockquote").html("Here is the message");
// JSON LINK: https://api.myjson.com/bins/1by0m3
$.getJSON("https://api.myjson.com/bins/1by0m3", function(json){
var html = "";
json.forEach(function(val){
var keys = Object.keys(val);
html += "div class = 'quote'"
keys.forEach(function(key){
html = key + val[key] + "<br>";
});
html += "</div><br>";
});
$("p").html(html);
});
});
});
I have no idea about how to generate random quote
svg = d3.select("#visualBox")
.append("svg")
.attr("width", w)
.attr("height", h);
var bars = svg.selectAll("rect")
.data(dataSet)
.enter()
.append("rect")
.attr("class", "bar");
bars.attr("x", function(d, i) { return i * (w / dataSet.length); } );
bars.attr("y", function(d) {return h - scale(d.value); });
bars.attr("width", function(d) {return w / dataSet.length - padding; });
bars.attr("height", function(d) {return scale(d.value); });
bars.style("fill", function(d) {return color[d.state]; } );
@ccs99817 That
json is a JS array of quote objects. You can get a random quote by getting (and then accessing) a random element from that array.
and you can get a random element from an array with:
var arr = [5,6,7,8];
arr[Math.floor(Math.random()*arr.length)];
can someone pls help me? i'm on Truncate a String challenge and i get a weird error of
TypeError: newStr.join is not a function. this is my code:
```
function truncateString(str, num) {
// Clear out that junk in your trunk
var newStr = [];
if (str.length > num-3){
str = str.split('');
for (var i = 0; i < num-3; i++){
newStr += str[i];
}
newStr = newStr.join('') + "...";
str = newStr;
}
return str;
}
truncateString("A-tisket a-tasket A green and yellow basket", 11);
@HappyRedditor59 + coerces an array to a string. Use .push or .concat
@HappyRedditor59 better idea is to just use .slice for the original string, no need to split
@forkerino will try that thanks
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it says multiplyAll[i] is undefined dont understand why please help
function multiplyAll(arr) {
var product = 1;
// Only change code below this line
for(var i=0;i<multiplyAll.length;i++){
for(var j=0;j<multiplyAll[i].length;j++){
product*=multiplyAll[i][j].length;
} }
// Only change code above this line
return product;
}
// Modify values below to test your code
multiplyAll([[1,2],[3,4],[5,6,7]]
@lucky73 your array is named
arr... multiplyAll is the function name
so instead on multiplyall i shoud be writing arr @forkerino
hey guys, i dont understand why it returns false here :
function confirmEnding(str, target) {
// "Never give up and good luck will find you."
// -- Falcor
for (var i = 0; i < str.length; i++) {
if (str.substr(str.length-1) && str.substr(str.length-4) == target) {
return true;
} else {
return false;
}
}
return str;
}
confirmEnding("Bastian", "n");
@lucky73 yes
but it does not fits taste cases @forkerino
test*
@lucky73 there is a inside your loops, do you still have .length when you multiply? Numbers don't have lengths.
no i dont have @forkerino
@manonja you are testing if the last four characters of the string are equal to target. This can only be true if target is four characters long.
@lucky73 show your current code
function multiplyAll(arr) {
var product = 1;
// Only change code below this line
for(var i=0;i<arr.length;i++){
for(var j=0;j<arr[i].length;j++){
product*=arr[i][j];
} }
// Only change code above this line
return product;
}
// Modify values below to test your code
multiplyAll([[1,2],[3,4],[5,6,7]]);
@forkerino
@manonja In JS, you can compare strings with
===, so you can solve it without a loop by making a substring from str and comparing with target.
@forkerino thank you it worked
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var string = "Split me into an array";
var array = [];
// Only change code below this line.
array = string.split('');
@lucky73 I thought so. :+1:
what i have to do with this pls?
@mthinh do they want you to split into words or characters?
You should split the string by its spaces.
i dont understand what they mean?
@mthinh array = string.split(' ');
Hey all
@manonja the idea is to take the end of str, with the same length as target and compare it to target. So if target is 3 long, take three from the end of str.
@dreamtheater2195 i did the same, it doenst work
@mthinh '' is not a space, but empty string. Put a space in there
ok got it @forkerino thanks !
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oh i see , tks you :D
:bulb: to format code use backticks! ``` more info
@dreamtheater2195 are you vnese :D
@mthinh yes i am
Hey guys, I am struggling with the Profile look Up question. My problem is that my code only searches for the first i (0); and it does not iterate through the whole nested array. I have looked online and I have seen "recursion" being touted as a possible solution, however, I don't think it should be that complicated. Please help.
function lookUpProfile(firstName, prop){
// Only change code below this line
for (i = 0; i < contacts.length; i++){
if (contacts[i].firstName === firstName && contacts[i].hasOwnProperty(prop)) {
return contacts[i][prop];
}
else if (contacts[i].firstName !== firstName){
return "No such contact";
}
else if (contacts[i].hasOwnProperty(prop) !== true){
return "No such property";
}
}
// Only change code above this line
}
@chinemelu Simplest structure would be two nested if's for the first name and property existence tests. Using multiple tests like that on one if leads to repeating conditions.
Hi everyone ! I can't see whats wrong with my code here :
function destroyer(arr) {
// Remove all the values
for (var i = 0; i < arguments.length; i++) {
for (var j = 0; j < arr.length; j++) {
if (arguments[i] === arr[j]) {
arr.splice(arr[j], 1);
}
}
}
return arr;
}
var ourArray = [1,2,3];
ourArray[1] = 3; // ourArray now equals [1,3,3].
// Setup
var myArray = [3,2,3];
ourArray[0] = 3;
// Only change code below this line.
hi guys what's wrong
@dseillier Mutating the array you iterate over with a for loop usually messes up the indices. Even if you make it work somehow, the code is hard to understand.
@dseillier don't use
splice inside a loop. Splice change the instance of the array, so you have no certainty that the second time it loops over you are looking at the "same" data as before
@Masd925 :wave:
@Marmiz Yo.
Alright, thanks guys ! So I need to use the filter method instead of splice ?
@shashank1999coder
ourArray[0] = 3;You are changing ourArray when you should change myArray
@Masd925 Thanks a lot. I will try it now.
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@dseillier if you use .filter you don't need a loop
@Masd925 :wave:
@forkerino Hello.
@forkerino even if I need to iterate on every argument provided ?
I'm implementing Dijkstra's algorithm for the first time.... @Masd925
@dseillier you can use another method for that if you put them in an array.
@dseillier
filter already loop into the array and execute a function for every instance of it
@forkerino Expression parser for calculator?
@Marmiz thank you
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@Marmiz okay thanks, I'll try that
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@dseillier give the docs a read :)
@Masd925 shortest path problem
@Marmiz Yes I read that, but I can't figure out how to pass some arguments inside the filter method so that it returns a new array without those arguments as elements..
@forkerino ok. One man should only have one algorithm named after him.
@Masd925 :joy: I agree
I think I have some issue understanding how the
argumentobject works
@Masd925 Good Morning
@Lumexralph :wave:
@forkerino I always get suspicious when I see a number greater than 1 somewhere.
0 and 1 are logical results for many things, but why for example 5 :rat:
@Lumexralph Hello.
@dseillier example:
var arr = [1, 2, 3, 4, 5]
var filtered = arr.filter(function(value){
console.log(value) // so that you'll see in console that is looping into the array --> 1 - 2 -3 -4 -5
return val > 3
})
arr // [1, 2, 3, 4, 5]
filtered // [ 4, 5] only number > 3 has been returned
I tried that :
function destroyer(arr) {
// Remove all the values
var newArr = arr.filter(function(value) {
return value !== arguments;
});
return newArr;
}
Can someone help me with the Exact Change Challenge? Some hints on how to go about it...?
https://www.freecodecamp.com/challenges/exact-change
https://www.freecodecamp.com/challenges/exact-change
@dseillier you have to isolate the two arguments array. it's not enough to say
Have you printed it in console to see what
!= argumentsHave you printed it in console to see what
arguments is actually looking like?
@forkerino Good Morning Bro!
@forkerino While you are doing the Dijkstra thing, could you also prove that the shortest distance between two points on an infinite space is a straight line?
@dseillier when prototyping and working with functions I suggest you to use something that lets you quick test and see the data easier than FCC console.
I like https://repl.it/languages/javascript
I like https://repl.it/languages/javascript
@forkerino I have though about how pathing works in some computer games. They must use something resembling Dijkstra to find paths between a place where someone is and where he want's to go.
@Marmiz thank you for the advice ! :-)
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:warning: dseillier already gave marmiz points
@dseillier That filter callback function has its own arguments object.
Can someone help me with the Exact Change Challenge? Some hints on how to go about it...?
https://www.freecodecamp.com/challenges/exact-change
anyonee???
@vedant15188 A robust way to avoid float rounding problems is to work with penny amounts that are safe integers.
okay... and umm what about the answer array... i have to sort to accordingly... how do i do that with a 2d array ...? @Masd925
@vedant15188 Most likely you will need on object of some kind that holds the mapping between note names and values. I solved it then by reversing and iterating the array
cid.
@Masd925 that algorithm is used in computer networking by routers in the
OSPF model
Hi, I'm having trouble with the Word Blanks challenge. My code follows:
```function wordBlanks(myNoun, myAdjective, myVerb, myAdverb) {
var result = "";
// Your code below this line
var myNoun = "dog";
var myAdjective = "big";
var myVerb = "ran";
var myAdverb = "quickly";
result = "The " + myAdjective + " " + myNoun + " " + myVerb + " " + myAdverb + ".";
// Your code above this line
return result;
}
// Change the words here to test your function
wordBlanks("cat", "little", "hit", "slowly");``` Doesn't pass the third test...
function lookUpProfile(firstName, prop){
// Only change code below this line
for (var i = 0; i < contacts.length; i++){
for(i in firstName){
if(contacts[i].firstName===firstName){
if(contacts[i].hasOwnProperty(prop)===true){
return contacts[i][prop];
} else {
return "No such property";
}
}
// Only change code above this line
}
}
}
I can't get the function to return the element that was removed in the "Stand In Line" exercise...
function nextInLine(arr, item) {
// Your code here
testArr.push(item);
testArr.shift();
return item; // Change this line
}
// Test Setup
var testArr = [1,2,3,4,5];
I need to be able to access contacts and search of a number is there or not also
profile look up challange
@Masd925 Does using an elastic band between two points count as proof?
if (contacts.hasOwnProperty(firstName)===true)
return contacts.firstName;
else
return "No such contact";
if (contacts.hasOwnProperty(prop)===true)
return contacts.prop;
else
return "No such property";
return contacts.firstName;
else
return "No such contact";
if (contacts.hasOwnProperty(prop)===true)
return contacts.prop;
else
return "No such property";
I know this is incorrect, but can't figure out what.
Any help?
morning, kind folks of codeland :wave:
@OldmanVimes try
return contacts[prop]instead
@arcteryx I just did this exercise, try leaving the variables down where they were when the lesson loaded. let me go back a look at what I did.
@aday091 change testArr to
arr and return arr.shift(); not item
thanks @Lumexralph
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@arcteryx what was the name of that exercise
@pwadeveloper you need a loop not 2 loops
@OldmanVimes - you recognize that
contacts is an array? Are you writing some type of code to iterate through the array, like a for loop? And if you are, are you generating an index - you have to use that to access the array elements.
@dseillier made no difference, actually this is an array, so will hasOwnProperty() work?
@aday091 Word Blanks : Obviously spec'd by a salesman!
@Lumexralph I did that but now it's violating the two opposite parameters... any ideas?
@khaduch so do I first need to define a for loop e.g. for i=0,i<arr.length,i++?
@oldmanvimes - yes! That's the idea
@khaduch Hallo :wave:
@arcteryx make sure that when you call the wordBlanks function and pass the arguments that it is outside of the function itself. Does that make sense?
@Lumexralph - hello there! How are you doing?
@OldmanVimes
for ( var i = 0; i < contacts.length; i++ ) { is the start of the loop that you want.
@kjuchtmans is discovering new toys: .hide() and .show() :baby:
who cares to give me feedback on my "Wikipedia Viewer"?
pen
it's working for me (notwithstanding the bland styling)
any tips welcome on e.g. :
- confusing or superfluous code
- ill logic
- general code aesthetics
would help me a lot! I'm slowly falling in love with jQuery
function factorialize(n) {
for(var i = 1; i < n+1; i++){
var resutl = n*(n-i);
return resutl;
}
}
factorialize(5);
what did I do wrong here?
@aday091 No. I only have a function definition and a definition call... non-recursive.
Hi @kjuchtmans - it seems that the wikipedia search works. One thing that would be nice would be to put the keyboard focus on the search box when you open it. If I put a nonsense string in the search box, it doesn't do anything like tell me "No results found". Good start!
@arcteryx it should look like this:
My code satisfies the first 2 req's, not the third....
wordBlanks("","","","") should return a string.
wordBlanks("dog", "big", "ran", "quickly") should contain all of the passed in words separated by non-word characters (and any additional words in your madlib).
wordBlanks("cat", "little", "hit", "slowly") should contain all of the passed in words separated by non-word characters (and any additional words in your madlib).
wordBlanks("","","","") should return a string.
wordBlanks("dog", "big", "ran", "quickly") should contain all of the passed in words separated by non-word characters (and any additional words in your madlib).
wordBlanks("cat", "little", "hit", "slowly") should contain all of the passed in words separated by non-word characters (and any additional words in your madlib).
@Lumexralph a single loop didnt work
function wordBlanks(myNoun, myAdjective, myVerb, myAdverb) {
var result = "";
// Your code below this line
result = "This " + myAdjective + " " + myNoun + " " + myVerb + " " + myAdverb +"!";
// Your code above this line
return result;
}
// Change the words here to test your function
wordBlanks("exercise", "freeCodeCamp", "is", "Bullshit");
The code cleared all the conditions i just need where to insert another return statement
to return "No such Contact"
function lookUpProfile(firstName, prop){
// Only change code below this line
for (var i = 0; i < contacts.length; i++){
for(i in contacts){
if(contacts[i].firstName==firstName){
if(contacts[i].hasOwnProperty(prop)===true){
return contacts[i][prop];
} else {
return "No such property";
}
}
// Only change code above this line
}
}
}
how are you guys getting those screenshots of the console?
where to insert this
if(contacts[i].prop!==prop){
return "No such contact";
}
@aday091 type "
javasctipt
@aday091 - - for code posting information see https://forum.freecodecamp.com/t/markdown-code-formatting/18391 - basically, use backticks, like ``` on a line all alone at the start and end of your code block.
@aday091
javascript
function factorialize(n) {
for(var i = 1; i < n+1; i++){
var result = n*(n-i);
return result;
}
}
factorialize(10);
@pwadeveloper
look at mine
function lookUpProfile(firstName, prop){
var a;
for(var i=0;i<contacts.length;i++){
if (firstName===contacts[i].firstName && contacts[i].hasOwnProperty(prop)===true){
a= contacts[i][prop];
break;
}
else if(firstName!==contacts[i].firstName && contacts[i].hasOwnProperty(prop)===true){
a="No such contact";
}
else {
a= "No such property";
}
}
return a;
}
'''
function wordBlanks(myNoun, myAdjective, myVerb, myAdverb) {
var result = "";
// Your code below this line
result = "This " + myAdjective + " " + myNoun + " " + myVerb + " " + myAdverb +"!";
// Your code above this line
return result;
}
// Change the words here to test your function
wordBlanks("exercise", "freeCodeCamp", "is", "Bullshit");
'''
:bulb: to format code use backticks! ``` more info
why my loop doesnt work pls
function lookUpProfile(firstName, prop){
// Only change code below this line
for (var i = 0; i < contacts.length; i++){
for(i in contacts){
if(contacts[i].firstName==firstName){
if(contacts[i].hasOwnProperty(prop)===true){
return contacts[i][prop];
} else {
return "No such property";
}
}
if(contacts[i].prop!==prop){
return "No such contact";
}
// Only change code above this line
}
}
}
@pwadeveloper so i have no idea why it is not working
for (i=0;i<contacts.length;i++){
if (contacts[i].hasOwnProperty[firstName]===true)
return contacts[firstName];
else
return "No such contact";
if (contacts[i].hasOwnProperty[prop]===true)
return contacts[prop];
else
return "No such property";
}
if (contacts[i].hasOwnProperty[firstName]===true)
return contacts[firstName];
else
return "No such contact";
if (contacts[i].hasOwnProperty[prop]===true)
return contacts[prop];
else
return "No such property";
}
@khaduch not working
@khaduch thanks for taking a look. yeah, even FCC example was not really interactive on nonsense strings; just did nothing. Wikipedia web search gives you meaningful alternatives in that case, but I'm a bit hesitant -if interested- to code out 'Did you mean...?' options.
Any thoughts on how this could be done?
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@OldmanVimes - getting there. You need to see if the
firstName property has the same value as the firstName variable.
'''js
function wordBlanks(myNoun, myAdjective, myVerb, myAdverb) {
var result = "";
// Your code below this line
result = "This " + myAdjective + " " + myNoun + " " + myVerb + " " + myAdverb +"!";
// Your code above this line
return result;
}
// Change the words here to test your function
wordBlanks("dog", "big", "ran", "fast");
'''
:bulb: to format code use backticks! ``` more info
@kjuchtmans - I figured that just outputting a message "No results found for your search" was better than sitting there idle, so that the user gets feedback. I haven't tried the FCC example lately to recall what they did with that. Seems like a good way to enhance the user experience?
'''js
function wordBlanks(myNoun, myAdjective, myVerb, myAdverb) {
var result = "";
// Your code below this line
result = "This " + myAdjective + " " + myNoun + " " + myVerb + " " + myAdverb +"!";
// Your code above this line
return result;
}
// Change the words here to test your function
wordBlanks("exercise", "freeCodeCamp", "is", "Bullshit");
'''
:bulb: to format code use backticks! ``` more info
@khaduch yup. will give it a shot. cheers
@aday091 - the backtick - usually on the upper-left key just below the escape key. You can go back and edit your post to change it. ``` is what you want to enter.
@kjuchtmans - Cheers!
haha so I should stop trying to use single quotes...
function factorialize(n) {
for(var i = 1; i < n+1; i++){
n = n*(n-i);
return n;
}
}
factorialize(10);
why my loop doesnt work ? pls
@aday091 - - for code posting information see https://forum.freecodecamp.com/t/markdown-code-formatting/18391 - basically, use backticks, like ``` on a line all alone at the start and end of your code block.
Check that forum post for details
Check that forum post for details
@mthinh - you cannot use the value that you are modifying within the loop to check for the loop termination condition. That's one thing that could go wrong - are you getting flagged as an infinite loop?
@khaduch that's what I was looking at but got hung up on the single quotes. figured it out now. thanks
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@khaduch Tell us a little bit what is your routine to have 303 streak days :)
Seeeeeeeeriously??? The solution was to submit once w/ dog, big, ..... and again w/ cat, small...... who wrote these "challenges"?
@khaduch so what i have to do now ?
@arcteryx - it's just an exercise to get accustomed to how to use function arguments, string concatenation, and follow instructions... :)
Thank you , @aday091 !
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@khaduch :clap:
@mthinh - I would say to make a separate variable to calculate your result.
n is the final value that you would want your loop to handle. A separate variable to accumulate your answer would mean that you keep n as it is, and generate a result that you can then return.
I'm still having an issue getting the return line to work for me on the "wait in line" exercise. Any suggestions?
function nextInLine(arr, item) {
// Your code here
testArr.push(item);
testArr.shift();
return arr.shift(); // Change this line
}
// Test Setup
var testArr = [1,2,3,4,5];
@aday091 - within the function, you should not use
testArr. There are two function argument - arr is the array that you should be working with. item is the item that you should be adding to the array.
Hey folks. Anyone willing to help me with a IIFE / closures-related question?
@RobMeador we can try.
// This works with an IIFE
var budgetController = (function() {
var x = 23;
var add = function(a) {
return x + a;
}
return {
publicTest: function(b) {
console.log(add(b));
}
}
})();
budgetController.publicTest(5);
// Yet this does not work (without IIFE)
var budgetController = function() {
var x = 23;
var add = function(a) {
return x + a;
}
return {
publicTest: function(b) {
console.log(add(b));
}
}
};
budgetController(); // After this line, shouldn't var budgetController have access to publicTest?
budgetController.publicTest(5);
I can't figure out why the second version of this code doesn't work. I'm not grasping the role of the IIFE here.
@khaduch I'm still confused, changing testArr to arr within the function actually made it worse, or am I misunderstanding you completely?
@RobMeador - this will take a while (at 4:40 a.m.)... :)
@khaduch No problem
@aday091 - you had another issue. You are using
.shift() twice in your code. You should only use it once...
@aday091 - in other words - do the
.push() and then return what you get from the .shift()
@RobMeador - this article: http://javascriptissexy.com/understand-javascript-closures-with-ease/ - explains it "with ease"...
This code meets two of the four requirements
@RobMeador I think the first one
budgetController is assigned the function publicTest
@RobMeador on the second one,
budgetController is assigned with a function with no parameter
@longnt80 If you're suggesting it's a naming conflict, I don't think that's it. I've just commented out one of the two sections before trying to run the code.
This code meets two of the four requirements
function nextInLine(arr, item) {
// Your code here
testArr.push(item);
testArr.shift();
return arr.shift(); // Change this line
}
// Test Setup
var testArr = [1,2,3,4,5];while this code meets the opposite two:
function nextInLine(arr, item) {
// Your code here
testArr.push(item);
testArr.shift();
return item; // Change this line
}
// Test Setup
var testArr = [1,2,3,4,5];
@RobMeador no I'm not talking about naming conflict
@longnt80 Got it
@longnt80 I think I'm in over my head. Sorry, I don't understand what you mean.
@khaduch I'll read the article. Thank you
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@aday091 - neither one is correct... You need to use
arr within the function. Take your first code block, change testArr to arr within the function. Then remove the line that currently says testArr.shift(). Keep your return line. See what happens.
@RobMeador - take the phrase "with ease" under advisement... ;)
@Masd925 hey, please could you explain what you mean by "repeating conditions"
Could someone please explain why this is not working? ```javascript
function lookUpProfile(firstName, prop){
// Only change code below this line
for (var i=0; i<contacts.length; i++){
if (firstName === contacts [i].firstName) {
if (contacts[i].hasOwnProperty(prop))
return contacts[i][prop];
return 'No such property';
}
return 'No such contact';
}
}
@khaduch your a smart guy Ken, Thanks. now I have to go stare at the screen for an hour to figure out what just happened.
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:warning: aday091 already gave khaduch points
@RobMeador
ok so the first one,
the second one,
ok so the first one,
budgetController is an object with property publicTestthe second one,
budgetController is a function
@aday091 - you might be interested to take this example and run it on the http://pythontutor.com/javascript.html site. It is an interesting way to visualize the operation of the code. It might take a couple runs through it to get what it's showing you, but it is kind of cool...
@RobMeador on the second example, when you type the line
budgetController();it runs the function and return the object but you didn't store that object anywhere
@RobMeador - you're in good hands with @longnt80 ... and keep that article on file to get an in-depth understanding and for reference. Good luck!
@RobMeador here's the example: https://repl.it/ISo5/14
@khaduch just to clarify:
js return arr.shift(); is both removing the last item in the array and returning its value?
return arr.shift();
@longnt80 I see. Keeping that in mind, I got the second example (without IIFE) to work by doing this:
var budgetController = function() {
var x = 23;
var add = function(a) {
return x + a;
}
return {
publicTest: function(b) {
console.log(add(b));
}
}
};
var newVar = budgetController(); // After this line, shouldn't var budgetController have access to publicTest?
newVar.publicTest(5);
@aday091 - correct. You could make it a two-step operation but this is more efficient.
@longnt80 That's helpful. Thank you!
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@RobMeador np
@khaduch just ran the code on the site you recommended and it's amazing! totally answered my question along with your response. Thanks again.
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:warning: aday091 already gave khaduch points
@aday091 - bookmark that site! A great learning tool... good luck!
@RobMeador fot the second one you can do this too:
budgetController().publicTest(5);
Halp!! i´ve stucken and i cant get out!, i cant figure out what im missing on Basick javascript: Profile Lookup... can someone help?
@Martin-Alvarado-A lets see your code
ty, here´s the whole thing
//Setup
var contacts = [
{
"firstName": "Akira",
"lastName": "Laine",
"number": "0543236543",
"likes": ["Pizza", "Coding", "Brownie Points"]
},
{
"firstName": "Harry",
"lastName": "Potter",
"number": "0994372684",
"likes": ["Hogwarts", "Magic", "Hagrid"]
},
{
"firstName": "Sherlock",
"lastName": "Holmes",
"number": "0487345643",
"likes": ["Intriguing Cases", "Violin"]
},
{
"firstName": "Kristian",
"lastName": "Vos",
"number": "unknown",
"likes": ["Javascript", "Gaming", "Foxes"]
}
];
function lookUpProfile(firstName, prop){
// Only change code below this line
for(var i=0; i<contacts.length; i++){
var boolean= contacts[i].hasOwnProperty(firstName);
if(boolean === true){
var val1="";
val1=contacts[i].firstName;
return val1;
}
else{
return "No such contact";
}for(var j=0; j<contacts[i].length; j++){
while(boolean === true){
var boolean2= contacts[i].hasOwnProperty(prop);
if(boolean2 === true){
var val2="";
val2 += contacts[i][j].prop;
return val2;
}
else{
return "No such property";
}
} }
}
// Only change code above this line
}
// Change these values to test your function
lookUpProfile("Akira", "likes");
.... sorry, never paasted code here before
i can tell the .hasOwnProperty(firstName) has to be written like: .hasOwnProperty("firstName"), but it doesnt do anything
Code formatting on gitter: https://forum.freecodecamp.com/t/markdown-code-formatting/18391
//Setup
var contacts = [
{
"firstName": "Akira",
"lastName": "Laine",
"number": "0543236543",
"likes": ["Pizza", "Coding", "Brownie Points"]
},
{
"firstName": "Harry",
"lastName": "Potter",
"number": "0994372684",
"likes": ["Hogwarts", "Magic", "Hagrid"]
},
{
"firstName": "Sherlock",
"lastName": "Holmes",
"number": "0487345643",
"likes": ["Intriguing Cases", "Violin"]
},
{
"firstName": "Kristian",
"lastName": "Vos",
"number": "unknown",
"likes": ["Javascript", "Gaming", "Foxes"]
}
];
function lookUpProfile(firstName, prop){
// Only change code below this line
for(var i=0; i<contacts.length; i++){
var boolean= contacts[i].hasOwnProperty(firstName);
if(boolean === true){
var val1="";
val1=contacts[i].firstName;
return val1;
}
else{
return "No such contact";
}
for(var j=0; j<contacts[i].length; j++){
while(boolean === true){
var boolean2= contacts[i].hasOwnProperty(prop);
if(boolean2 === true){
var val2="";
val2 += contacts[i][j].prop;
return val2;
}
else{
return "No such property";
}
}
}
}
// Only change code above this line
}
// Change these values to test your function
lookUpProfile("Akira", "likes");
ty
Wow, your function is pretty complex. There seem to be a few misunderstandings.firstName contains a string to compare to the value of contacts[i].firstName. It does not contain a property name, and contacts[i].firstName is probably nothing to return.
You should return "No such contact" after you've made sure none of the objects' firstName property matches the string in firstName.
contacts[i] has no length property. Also, don't use .prop, which is equal to ["prop"] and uses static property name "prop" when you meant to use the string in variable prop, which would require [prop]
@Lumexralph ok.
@forkerino No, it is just a piece of circumstantial evidence.
gimme a min to take that info in
@Martin-Alvarado-A You should need only one loop, in which you take action only if the name of the current contact matches. Only in case you finish the loop without having met any name match, return "No such contact".
ok, 1 loop
hang on
im still confused :(
@Blauelf i get the contacts[i].firstName not having a property name, only a string, but how do i have it return the value of firstName as intended?
Compare
firstName to contacts[i].firstName. Neither of them is a value to return, just that a match between the two means you've found the contact.
@Blauelf hence my var boolean, i meant to compare if firstName was there, THEN take action to return the value corresponfing to the fistName key... or so i think i did
Hi guys, I am wondering what the issue is with this ternary conditional statement... Anyone?
return startIndex == target ? true : false;
@Martin-Alvarado-A There always is a
firstName property in this case.
@WAINGOR Removing
? true : false does not change the meaning
@WAINGOR That is the same as
return startIndex == target;
I just died a little inside reading that line lol
@WAINGOR It's the same logic as in Returning Boolean Values from Functions, just that this lesson uses if/else instead of ternary operator.
@Mortichar lol
@Blauelf yes... so i guess i should not look for the key, just the value? but how do i do that, i guess im blocked, ive been at this for 2 days now, reviewing the last 10 excercises over and over...
The steamroller challenge... happy I've finally used something recursive
and external lessons, still, im confused
@Mortichar After that you can try to find a non-recursive solution ;)
@Martin-Alvarado-A Check
if (contacts[i].firstName === firstName) { and inside that have an if-else or the ternary operator, testing the existence of the property named by prop
Love letters in the sand!
@Masd925 it's incredibly easy to do it iterative... just limited on depth
@Mortichar I mean a non-recursive solution that is not limited in depth.
And an elegant one too :muscle:
@Blauelf ty, im gonna try that and ill be off this for today, start fresh tomorrow :)
:star2: 4405 | @blauelf |http://www.freecodecamp.com/blauelf
martin-alvarado-a sends brownie points to @blauelf :sparkles: :thumbsup: :sparkles:
? i did?
how? what are those?
@Masd925 I think you'd have to show me a solution that's iterative and not limited in depth, sounds interesting. JS is the language I am the least familiar with (of the ones I use)
for (i=0;i<contacts.length;i++){
if (contacts[i].hasOwnProperty(firstName)===true)
return contacts(firstName);
else
return "No such contact";
if (contacts[i].hasOwnProperty(prop)===true)
return contacts(prop);
else
return "No such property";
}
if (contacts[i].hasOwnProperty(firstName)===true)
return contacts(firstName);
else
return "No such contact";
if (contacts[i].hasOwnProperty(prop)===true)
return contacts(prop);
else
return "No such property";
}
Please help
@Masd925 My first non-recursive solution was ugly. With lots of splicing, like
function steamrollArray(arr) {
arr = arr.slice(); // creating copy as I'm going to mutate
for (var i = 0; i < arr.length; i++) {
if (Array.isArray(arr[i])) {
var newArr = arr.splice(i, 1)[0];
Array.prototype.splice.apply(arr, [i, 0].concat(newArr));
i--;
}
}
return arr;
}
@Mortichar Here is one:
function steamrollArray(arr) {
while (arr.some(Array.isArray)) {
arr = Array.prototype.concat.apply([],arr);
}
return arr;
}
@Blauelf I have also made at least dozen solutions.
@Mortichar So it concats all the elements as long as there are array elements there.
that's actually recursive. btw.
you're setting it to the new result and then calling it again in the while
@khaduch I just cannot understand where am I going wrong
@Mortichar No, I don't see recursion.
Recursion means a function calling itself.
That is a loop.
@Masd925 You're performing recursion on the results though. :wink: There is more than direct recursion (which is a function calling itself)
@Blauelf lol... You are so right! Thanks
waingor sends brownie points to @blauelf :sparkles: :thumbsup: :sparkles:
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@Mortichar You mean the "structurally recursive" part?
@Blauelf @Masd925 I'm having a problem implementing Dijkstra's algorithm. I need to keep track of the path, so the idea was to create an array of objects as nodes. However when I do this, I don't get the output I expected (an array filled with similar objects):
let nodes = new Array(numberOfIntersections).fill({cost: Infinity, path:[], visited: false});all objects share the same reference, so when I change one, I change them all.
I also tried:
let nodes = new Array(numberOfIntersections).map(()=>({cost: Infinity, path:[], visited: false}));but this resulted in an empty array (of the right length).
...
I'm confused.
map maps only values, new Array(numberOfIntersections) creates an empty sparse array.
Try
let nodes = Array.from({length:numberOfIntersections}, ()=>({cost: Infinity, path:[], visited: false}));
@Blauelf ah, yes that makes sense.
That's a problem I've run into myself. Which led to strange nested array constructors, in the first step getting an empty sparse array, and only in the second step having an array full of
undefineds that I could map.
Array.apply(null, new Array(numberOfIntersections)).map(...)