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
click more info below to see how to format your code for the chat room (that'll make it easier to read)
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
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function repeatStringNumTimes(str, num) {
// repeat after me
var longstr = "";
while (num > 0) {
num--;
longstr += str;
}
return longstr;
}
repeatStringNumTimes("abc", 3);
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
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'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
@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
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?
//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");
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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
$(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 + "℉");
}
});
});});
$(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.
@EricHasegawa Use your loop to check whether each word in your string is longer than longestWord. If it is larger, then longestWord should change.
@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.
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");
@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
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
@LifuTao For each click it's printing separate result instead of updating the previous one
'''
@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
@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
@LifuTao oh okay
@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
@EricHasegawa The order that you place the variables in counts. You are very close to the answer
@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;
@revisualize :)
$("#inCelsius").click(function(){
$("#temperature").html(tempInCelsius+"°C");
});
5 miles.
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
@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.
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
@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!
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Does anyone know what this means?. I tried googling it but I dont quite understand the stack overflow answers
@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
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@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 can't get the golf code...
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?
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@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"
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"
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
@thekholm80 After Googling the problem, that was never mentioned. Will I need the extra URL every time I try to use an API?
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!
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
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
@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();
@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) {
}
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
#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");mthinh sends brownie points to @chrono79 :sparkles: :thumbsup: :sparkles:
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@piyush805 you could use spread operator, an array won't work, unless you use map or something like that
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').
@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
@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
@forwebtech hey can you check what is wrong with my 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
@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.
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
if (strokes == someValue) {
return "someString";
} else if ...piyush805 sends brownie points to @chrono79 :sparkles: :thumbsup: :sparkles:
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@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"?
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 Yeah probably. Brain is just fried from today I guess.
@Chrono79 well i have solved it, how should i share ? i don't see any links of my solution ?
@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);
@heidisdad2 Global variables are NOT reset between the test runs.
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.
@revisualize let me give that a shot.. but i passed all the tests
@revisualize but that is for issues, not for instructions.
@Chrono79 did you check my solution ?
@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
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@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
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
I could create a video about the whole thing. But, I don't know if that's warrented.
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
if your up to the challenge do a PR
:)
I'm not.
There are not any additional Basic lessons about functions.
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.
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
I’ll be back tomorrow morning
goodnight everyone
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
myObj === true that part is wrong
and
checkProp.myObj is wrong too (for 2 reasons)
@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
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");
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
?
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];"
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=
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
@MarioC3
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
@moigithub what are you talking about? check my code, I didn't put any KEY
thats an example of case sensitive variables names :) @MarioC3
I received this:
anther example...
keyCODE is NOT the same as keycode neither keyCode
up*
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@codersc i had to use the .hasownproperty also, but i dont know how, right?
okey !
okey !
@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
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@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
@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
which challenge is it?
@codersc thanks kevin , i will try it, and came back if i get stuck!
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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
sorry i was trying few things.
post you code and click the more info for instructions on how to do that
more info link*
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
@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
Help please with this code myStr = "FirstLine\n \SecondLine\ \rThirdLine";
@LerithaPride1 eliminate any space in between your string, have you escaped backslash
\\ ?
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@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;
still i couldnt find solution for this
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\" ";
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");
@fdemaa First you need to loop or iterate through the
contacts array.
Then test the looped contact.
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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
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 Which is
([a-z])
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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]]);
'''
@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
@AlejandrLara12 all tests passed?
is 1am here in mexico haha
@AlejandrLara12 you can always go back later and try a different implementation
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``
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?
@poncatoera that is probably it
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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]]
@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
@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]?
@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);
im pretty sure there is a better way to get factorial. anybody?
@kpbro sorry, yours worked!
@cmccormack yes thank you that was a stupid mistake haha
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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
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 you can do all the multiplication inside your loop. Just make a separate variable for the result. Another way to solve it is recursively.
@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.
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 @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
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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.
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
sorry, i mean you needed to fix that that's the part you needed to write
:point_up:
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
@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?
@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 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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@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>";
});
@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
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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
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");
test*
@lucky73 there is a inside your loops, do you still have .length when you multiply? Numbers don't have lengths.
@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.
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var string = "Split me into an array";
var array = [];
// Only change code below this line.
array = string.split('');
@mthinh do they want you to split into words or characters?
i dont understand what they mean?
@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.
@mthinh '' is not a space, but empty string. Put a space in there
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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:
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
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@Masd925 :wave:
@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
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@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.
I think I have some issue understanding how the
argumentobject works
@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 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.
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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?
@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
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@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?
@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++?
@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?
@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!
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).
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
}
}
} 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.
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");
'''
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?
kjuchtmans sends brownie points to @khaduch :sparkles: :thumbsup: :sparkles:
:star2: 2995 | @khaduch |http://www.freecodecamp.com/khaduch