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.
But your loop keeps going, so if it hits another matching entry . . .
@hrokr how I should be doing it
@Chrono79 thanks for the help so far. im missing something because im new to arrays...
function updateRecords(id, prop, value) {
if (value !== "") {
if (collection[id].prop !== "tracks") {
collection[id].prop = value;
console.log("Not tracks!");
}
else if (collection[id].prop == "tracks") {
collection[id].prop.push(value);
}
else if (collection.hasOwnProperty[id].prop === false) {
collection[id].prop = value;
}
else {
delete collection[id].prop;
}
}
return collection;
}
hitmikey sends brownie points to @chrono79 :sparkles: :thumbsup: :sparkles:
:warning: hitmikey already gave chrono79 points
@hitmikey you can also edit or delete your own posts, the ... at the right of the timestamp
you can't use dot notation with prop either, in fact whenever you use a var as a property, use bracket notation
you can't use dot notation with prop either, in fact whenever you use a var as a property, use bracket notation
lol.
ok updating.
@umairbalani - I think most people are leary about just giving the answer because the struggling through it is important. But, I thin it's fair to say you'll need an if statement with a second option. So, like an if-else
ooh. that was a major issue.
@hitmikey rethink this block
else if (collection[id].prop == "tracks") {
collection[id].prop.push(value);
}
else if (collection.hasOwnProperty[id].prop === false) {
collection[id].prop = value;
}If "tracks" is non-existent before you update it, create an empty array before pushing a track to it.
You know how you can put
if (foo === false) -> if (!foo)
if (foo===true) -> if (foo)
if you put
if (maybeTrueOrFalse)will it evaluate the true or false?
in my example I have
function dropElements(arr, func) {
for (var i = 0; i < arr.length; i++) {
if (func(arr[i])) { //<—— on this line will this execute this line if func(arr[i]) is false or only when it is true?
return arr;
} arr.shift()
}
}
k. thanks for the guidance. i want to struggle to learn,
@Vanhealen Drop until true then return.
@sjames1958gm that wasnt the question
@Chrono79 - I noticed today .... well, this: FreeCodeCamp/FreeCodeCamp#9168
@sjames1958gm thequestion was more so if
will only go inside that conditional if func(arr[i]) is TRUE ? Or will it go inside the conditional if it is false?
if (func(arr[i])will only go inside that conditional if func(arr[i]) is TRUE ? Or will it go inside the conditional if it is false?
because func(arr[i]) returns a true or false, I didn’t explicitly say that I wanted the conditional to evaluate only for true
does
if (func(arr[i])the same thing as
if (func(arr[i]) === true)
@Vanhealen if it evaluates to true, or is truthy
truthY?
yes, not falsy
?
whats with the y
"a", 5, [1,2,3]
not only true
They're the actual terms.
???????????????
bool has true or false or null
Yerp.
nothing called truthy
var Car = function() {
// this is a private variable
var speed = 10;
// these are public methods
this.accelerate = function(change) {
speed += change;
};
this.decelerate = function() {
speed -= 5;
};
this.getSpeed = function() {
return speed;
};
};
var Bike = function() {
// Only change code below this line.
var gear=6;//private
this.setGear = function(){
myBike.setGear = 4;
};
this.getGear = function(){
return this.setGear;
};
};
//console.log(setGear);
var myCar = new Car();
var myBike = new Bike();
No, there is a thing called truthy and falsy in JS.
do yourself a a test, create an if (5) console.log("this is truthy");
@jesusdaver86 setGear needs a param and you have to change the value of gear inside it
this is also wrong:
this.getGear = function(){
return this.setGear;
};check the code example above
I'm stuck at the Stand in Line challenge...
@Vanhealen - what if we asked the value of "true" or "false"? do you think they would be the same as true or false, or for that matter True or False?
@anacou and your code is?
@anacou what is the issue exactly? we've already told you about shift() and push()
var count = 0;
function cc(card) {
// Only change code below this line
var answer = "";
switch(card) {
case 2:
case 3:
case 4:
case 5:
case 6:
count += 1;
answer = count + " Bet";
break;
}
if (card > 7 && card <10) {
answer = count + " Hold";
}
switch(card) {
case 10:
case "J":
case "Q":
case "K":
case "A":
count += -1;
answer = count + " Hold";
break;
}
return answer;
// 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');
i see
dam i was so confused
Still stuck at
Cards Sequence 2, J, 9, 2, 7 should return "1 Bet"
Cards Sequence 2, 2, 10 should return "1 Bet"
Cards Sequence 2, J, 9, 2, 7 should return "1 Bet"
Cards Sequence 2, 2, 10 should return "1 Bet"
@Chrono79 thanks
I'll try
I'll try
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what's this challenge called @Vanhealen
@umairbalani
if (card > 7 && card <10) {
answer = count + " Hold";
}this isn't right, in fact none of the answer assignations should be inside card evaluations
This still doesn’t work
function dropElements(arr, func) {
for (var i = 0; i < arr.length; i++) {
if (!func(arr[i])) {
arr.shift()
}
} return arr;
}
if you arr.shift() you also need to do i-- I believe
because you are removing an element
@Vanhealen - what's the name of that challenge?
and will then subsequently be skipping one
For starters, how do I write a function nextInLine which takes an array (arr) and a number (item) as arguments. I am assuming it's like this: function nextInLine(arr, item)
@Vanhealen reread the instructions:
Drop the elements of an array (first argument), starting from the front, until the predicate (second argument) returns true.
The second argument, func, is a function you'll use to test the first elements of the array to decide if you should drop it or not.
Return the rest of the array, otherwise return an empty array.
@anacou function nextInLine(arr, item) { }
that's it
ok
good
@Chrono79 what am i missing here to create an array instead of a single value?
else if (collection[id][prop] == "tracks") {
collection[id][prop].push(value);
}function dropElements(arr, func) {
for (var i = 0; i < arr.length; i++) {
if (!func(arr[i])) {
arr.shift()
i--
}
} return arr;
}
.push([value]); ?
@Vanhealen at the first not false you should return the array, not keep looking for falsy values
anacou I am stuck on the same one. I used a push and shift command on my return but now I've been struggling to return the element that was shifted
did that work @Vanhealen ?
@Vanhealen any particular reason you are using a loop?
@awbunys you could always save the first element as a variable at the start and then return it at the end?
@hitmikey you have to join the 2 ifs, nesting them
if (collection[id][prop] == "tracks") {
if ... {
collection[id][prop] = [];
}
// here you can use push safely
@etacalpha what sould i use
@etacalpha I dont want to use filter
@Magnesium-Mike Ill try that, thanks!
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@Magnesium-Mike @Chrono79 didtn work
The next step is confusing to me: "Add the number to the end of the array"? What number???
@Vanhealen what is the challenge called s o I can see my answer lol
@anacou I believe it is talking about your test number in the console log
@Magnesium-Mike drop it
dropElements
thanks @awbunys
anacou sends brownie points to @awbunys :sparkles: :thumbsup: :sparkles:
I cant use a callback because I dont want to go through all teh elements in the array
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Having trouble with record collection. Wrote my code twice before going to the forums but its still giving me an error
// Only change code below this line
function updateRecords(id, prop, value) {
if (value!==""&&prop=="tracks"){
collection[id][prop].push(value);
} else if(value!==""){
collection[id][prop] = value;
} else {
delete collection[id][prop];
}
return collection;
}
function updateRecords(id, prop, value) {
if (value!==""&&prop=="tracks"){
collection[id][prop].push(value);
} else if(value!==""){
collection[id][prop] = value;
} else {
delete collection[id][prop];
}
return collection;
}
@Vanhealen have you looked up .push and .shift
@etacalpha ya obviously
@Vanhealen there are multiple ways to end the loop
you could return in the else, use a break;
you could return in the else, use a break;
………..
doing increments: can someone help me out?
@Chrono79 @Magnesium-Mike I think I've come undone haha. link: https://www.freecodecamp.com/challenges/record-collection
function updateRecords(id, prop, value) {
if (value !== "") {
if (collection[id][prop] !== "tracks") {
collection[id][prop] = value;
}
else if (collection[id][prop] == "tracks") {
if (collection.hasOwnProperty[id][prop][value] === false) {
collection[id][prop][value] = [ ];
}
collection[id][prop][value].push();
}
}
else {
delete collection[id][prop][value];
}
return collection;
}
@guruice4 If "tracks" is non-existent before you update it, create an empty array before pushing a track to it.
@hitmikey change this:
man, you messed things up
collection[id][prop][value] to this collection[id][prop]push(); to this push(value);collection.hasOwnProperty[id][prop][value]to this collection[id].hasOwnProperty(prop)man, you messed things up
@meeyakoh what do you need?
@Vanhealen - still having trouble?
hahaha
shoot sorry to be a bother :-/ i was humming along until i got to this page
@hitmikey - you're getting stuck on a page where many do. That almost always means it isn't you but something else.
@Chrono79 Yeah I am stuck here and found 3 solutions online none work and I cannot figure out what I broke.
@Vanhealen I checked ,you do need to do i-- when you shift because say you had 4 element, you're looping for the first time so i = 0, it's false so you remove it, now the next loop starts at i is equal to 1 but you need to check position 0 since it's a new value because you just removed the first element
none work, because they've added a new test case, so those solutions don't apply
you have to address that case, you can't do undefined.push(value)
@hrokr haha thanks. im almost there, but for some reason, somethings broken with creating the array of 'tracks':
function updateRecords(id, prop, value) {
if (value !== "") {
if (collection[id][prop] !== "tracks") {
collection[id][prop] = value;
}
else if (collection[id][prop] == "tracks") {
if (collection.hasOwnProperty(prop) === false) {
collection[id][prop][value] = [ ];
}
collection[id][prop].push(value);
}
}
else {
delete collection[id][prop];
}
return collection;
}hitmikey sends brownie points to @hrokr :sparkles: :thumbsup: :sparkles:
:cookie: 267 | @hrokr |http://www.freecodecamp.com/hrokr
@Vanhealen so your issue is somewhere else, remember that if all conditions are wrong you also need to return an empty array
@hitmikey these 2 lines are still wrong:
if (collection.hasOwnProperty(prop) === false) {
collection[id][prop][value] = [ ];
@hitmikey value is not a property and shouldn't end up in [] on the left of =
@hitmikey - also, if you'll notice, it isn't just create. It's also update.
@hrokr he's updating it at the following line
damn, im too close.
i give up i cheated
@Chrono79 -- this is really interesting to me since they either the one I'm having or had trouble with... which is why I dissect them for CurriculumDevelopment list.
And then make issues of them.
@Chrono79 can you link what you have right now?
@Magnesium-Mike of what are you talking about?
oh it's @hitmikey's work not yours my bad
can somoen help me with this
Finding a Remainder in JavaScript
This message was deleted
For example the record collections code -- the canonical answer "works" but doesn't. It gives you the thumbs up but doesn't actually add the tracks push the tracks.
var remainder;11 % 3 = 2;
why doesn't that work
@verdelegend us modulus
@verdelegend I remember telling you what to do
var remainder; // you're declaring remainder as undefined
var remainder; // you're declaring remainder as undefined
11 % 3 does equal 2
@verdelegend you aren't assigning to remainder
forget it.
@hrokr the canonical doesn't work anymore because they've added a new test case
wow can't believe I've been on this challenge for over an hour
@hitmikey you just had to fix those 2 lines
Right but if a person can't diagnose the problem, they can't get the solution.
function updateRecords(id, prop, value) {
if (value !== "") {
if (collection[id][prop] !== "tracks") {
collection[id][prop] = value;
}
else if (collection[id][prop] == "tracks") {
if (collection[id].hasOwnProperty(prop) === false) {
collection[id][prop] = [ ];
}
collection[id][prop].push(value);
}
}
else {
delete collection[id][prop];
}
return collection;
}
@Chrono79 if you look at the forums the test cases we have appear to be the same and its the same one failing as those who claim the code worked
var result = arr.push(item);
result =arr.shift();
return result;
@hitmikey where is [id] here?
collection.hasOwnProperty(prop) === false) {
@Chrono79 updated... after collection?
@hitmikey yes
still broken and not creating an array
hmm
@Chrono79 - Right but if a person can't diagnose the problem, they can't get the solution. And if the challenge was updated, the answer needs to be too.
@Chrono79 not sure how myVar works
@verdelegend did you figure it out?
im not exactly sure how increment works as a whole
@hrokr internet doesn't work like that, and you're not supposed to go search the solution either, in time they'll update it, in the meantime, we have to help the people who can't work it out themselves
how do you guys include code markdown in chat? I can't seem to figure it out. 'Markdown help' also doesn't seem to do anything.
help format
:point_right: code formatting [wiki]
Multi line Code
```js ⇦ Type 3 backticks and then press [shift + enter ⏎] (type js or html or css)
<paste your code here>,
then press [shift + enter ⏎]``` ⇦ Type 3 backticks, then press [enter ⏎]
Single line Code
This an inline `<paste code here>` code formatting with a single backtick() at _start_ and _end_ around thecode`.
See also: ☛ How to type Backticks | ☯ Compose Mode | ❄ Gitter Formatting Basics
@Chrono79 - I agree. But a) I had already spent hours on it with no success. So, seeing where I was wrong was needed. But b) the code they have up there is almost the same as mine. All other things I had tried also had not worked.
what apis do I use for the random quote machine challenge ....?
@Chrono79 - and i've don't these exercises -- with great difficulty -- before. So, since many people have had/are having the same problems it's really safe to say the problem isn't with them/us. It's something missing in the course. That's why I add to the issues page.
@hrokr It can be a bug, until recently (earlier today) it was working
But as you can see, from the code they're pasted here, their code wasn't right
But as you can see, from the code they're pasted here, their code wasn't right
I'm doing the map challenge(https://www.freecodecamp.com/challenges/iterate-over-arrays-with-map) and this code outputs correct result to my dev tools console but won't pass the challenge. Error: You should only modify the array with map.
var oldArray = [1, 2, 3, 4, 5];
var newArray = oldArray.map(function(num) {
return num + 3;
});
Any ideas?
@hrokr @Chrono79 yes, there is a missing step in the course... i got it pretty much but im missing just a step about creating the array
@Chrono79 -- no, not true. It LOOKS like it does but check this out:FreeCodeCamp/FreeCodeCamp#9168 you'll need to look at the images at the bottom.
to the people here in general - are there different chatrooms for different levels/challenges? I feel like I'm disrupting the flow of the conversation here, but I could really use the help
@hitmikey -- so help folks out and list off what you think would make it more clear.
This message was deleted
@meeyakoh -- JS help, right?
@hrokr I don't know, until I get the solution right!!!
@meeyakoh this is the javascript chat, on the left bar there should be the different chat room names
@meeyakoh post your code (using the backticks!).
@hrokr I'm gonna explain one last time, they've added the case where an object hasn't the property tracks, the code in your screenshots is the solution to the challenge before that
If there is a bug for the right code for the challenge with this case (that wasn't added today or yesterday, just days ago and people was passing this challenge) is another story
If there is a bug for the right code for the challenge with this case (that wasn't added today or yesterday, just days ago and people was passing this challenge) is another story
PLEASE can anyone help me with this?
function reverseString(str) {
var i = str;
var s = i.split("");
var r = s.reverse();
var j = r.join('');
return j;
}
reverseString(["hello"]);
im trying to reverse "hello" which is str
you're trying to split an array
that only works on strings
so how do i get it don
do var i = str[0];
i know
i already did that
but there is a Problem with it
This message was deleted
if(Array.isArray(str)){}else{}
@ArsalanSavand convert to string, split string, reverse string, join string....return
@etacalpha how?
I did
but nothing works
lol
@ArsalanSavand should the call to the function be
reverseString("hello"); (no brackets in function call)
check if it's an array, if it is turn it into a string and continue, if not just go on as regular
look up MDNs for split() reverse() and join() @ArsalanSavand
@eeflores thanks it works>>>> look i wanna do it as e String but the challenge says doing it by [] is better
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at first i was like why but now im like Why????? again
PEACE THANKS EVERYONE!!
WOW. wish I could skip this challenge!
which one?
Record Collections
@hitmikey whats the errror
show me ur code
welp. i just skipped ahead and found a solution. what a pain in the butt
My code:
function updateRecords(id, prop, value) {
if (value !== "") {
if (collection[id][prop] !== "tracks") {
collection[id][prop] = value;
}
else if (collection[id][prop] == "tracks") {
if (collection[id].hasOwnProperty(prop) === false) {
collection[id][prop] = [ ];
}
collection[id][prop].push(value);
}
}
else {
delete collection[id][prop];
}
return collection;
}Solution:
function updateRecords(id, prop, value) {
if (prop === "tracks" && value !== "") {
if(collection[id][prop]){
collection[id][prop].push(value);
}
else{
collection[id][prop]=[value];
}
} else if (value !== ""){
collection[id][prop] = value;
} else {
delete collection[id][prop];
}
return collection;
}
@hitmikey your code was still wrong
if (collection[id][prop] !== "tracks") { should be if (prop !== "tracks") {
@Chrono79 I know, i used the solution. I guess my ordering was incorrect?
@hitmikey no, try to fix your own code
function isLess(a, b) {
// Fix this code
return a===b;
}
// Change these values to test
isLess(10, 15);
what am i doing wrong?
@hitmike Your ordering is fine, look at the difference between your code and the code that works.
Hey guys...just started the JS section and already feel like I'm missing something on Celsius to Farenheit.
@Physicallime570 the function name is isLess, === isn't the logical comparison you want to use
@Chrono79 ahhhh. that was the mistake that caused the whole problem. i was evaluating the existing var vs. the argument...
@hitmikey yes
@Chrono79 @Magnesium-Mike lesson learned lol. painfully. thank you both.
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sorry I couldn't catch it before, I'm tired
@Chrono79 what exactly should i be using?
@Physicallime570 do you know what these 2 mean? < >
This message was deleted
@Chrono79 I guess I should read all of the requirements in the challenge so that i can logically assemble the code better right? for example, i had nested if's when i could've had it simplified as in the solution i posted.
i.e. i could've done a joint if statement like if XXX && XXX
hello i'm having an issue on the first .hasOwnProperty(); challenge. i don't know how to return the property's value. return checkProp(?)
@hitmikey you already have one nested if
Hey guys I'm having trouble getting one of my switch statements to work.
@endlessetudes no
its object.property (i think)
var count = 0;
function cc(card) {
// Only change code below this line
switch (card) {
case 2,3,4,5,6:
return "5 Bet" ;
break ;
case 7,8,9 :
return "0 Hold";
break;
case 10,"J","Q","K","A" :
return "-5 Hold" ;
break;
case 3,7,"Q",8,"A" :
return "-1 Hold" ;
break ;
case 2,2,10 :
return "1 Bet" ;
break ;
case 2,"J",9,2,7:
return "1 Bet" ;
break ;
case 3,2,"A", 10,"K":
return "-1 Hold" ;
break ; if (card==3){
return "-1 Hold";
} else if (card==7){
return"-1 Hold";
} else if (card=="Q") {
return "-1 Hold";
}else if (card==8) {
return "-1 Hold";
} else if (card=="A"){
return "-1 Hold";
}
}
// Only change code above this line
}
// Add/remove calls to test your function.
// Note: Only the last will display
cc(3); cc(7); cc("Q"); cc(8); cc("A");
@Chrono79 yea that would be greater than and less than
@hitmikey that solution is actually longer
having trouble getting Cards Sequence 3, 7, Q, 8, A should return "-1 Hold"
Does this look right for the temperature conversion code?
farenheit = (9/5)*celsius+32;
@Physicallime570 I think it's the other way around, this is lesser than
<
@Chipsta you cant return in the switch for this challenge, it wants you to process several cards to determine the bet
@anthom yes, but you misspelled fahrenheit
DOH...knew it had to be something stupid like that. thx
return myObj.checkProp ? i just don't know how to access the value of the property
@endlessetudes you can't use dot notation with vars (or with properties whose name contains spaces)
@Chipsta you can't use switch like that either
switch(card) {
case 2:
case 3:
...
}and so on
@Chrono79 that was it. i knew it was something simple. thank you. brownie points away
:star2: 1201 | @chrono79 |http://www.freecodecamp.com/chrono79
endlessetudes sends brownie points to @chrono79 :sparkles: :thumbsup: :sparkles:
You're going to want to define the values in a switch statement and then calculate the results and return the results using an if/else if statement
hey guys any tips on how to separate the array argument from the int arguments in the seek and destroy challenge?
arguments object @JKilk
arr (your function parameter) is already the array, an the rest of the arguments are the things you should seek and destroy in it
arr (your function parameter) is already the array, an the rest of the arguments are the things you should seek and destroy in it
right, how would access the first non array argument?
doing something like arr1 is giving me the second element from the array
arguments[1]
arrays are zero indexed so start with 0 for first item
@etacalpha he wants all but the first
Rando quote machine... 1st time incorporating JS into codepen project. Doesn't do so great with responsiveness because of the background photo placement. Got the twitter window to pop up instead of opening new window, and implemented a facebook sharing feature but its kind of buggy in CodePen - highlight quote to share on FB - only works in debug mode. Also, going to attempt a 2nd version using an API, this version uses a stored array since I had a specific request to do Frank Zappa quotes! Any feedback appreciated! http://s.codepen.io/no_stack_dub_sack/debug/GqqKyQ
yea the first argument is an array consisting of 6 elements, then the second and third arguemnts are ints
@hrokr in this challenge, it didn't really talk about using multi dimension arrays in a for loop, it just gives the example. some feedback i'd give is that i'd prefer to have a little more explanation so that i can retain the concept and apply it to a future challenge:
I must have missed something then, what exactly are you trying to do and do You have code to show us @JKilk
wait i think i've got an idea
help seek and destroy
:point_right: algorithm seek and destroy [wiki]
Algorithm Seek and Destroy
:triangular_flag_on_post: Remember to use Read-Search-Ask if you get stuck. Try to pair program :busts_in_silhouette: and write your own code :pencil:
:checkered_flag: Problem Explanation:
This problem is a bit tricky because you have to familiarize yourself with Arguments, as you will have to work with two or more but on the script you only see two. Many people hardcode this program for three arguments. You will remove any number from the first argument that is the same as any other other arguments.
Relevant Links
:pencil: read more about algorithm seek and destroy on the FCC Wiki
@etacalpha that challenge is what @JKilk is trying to do
nah my idea was wrong
thanks for that diego
anyway, paste your code if you get stuck, but if you think you can solve it without help, go ahead @JKilk
so just generally speaking if i have a function e.g. function foo(arg), and i call the function with arguments: foo([1, 2, 3], 4, 5, 6), within my function body how do i access 4, 5, or 6
Can anybody help me on this.
Encode the following sequence, separated by spaces:
backslash tab tab carriage-return new-line and assign it to myStr
backslash tab tab carriage-return new-line and assign it to myStr
if i try arg3 it returns null
My answer is var myStr = "\ Back Slash \t \t Tab \r Carriage-return \n New Line";
@JKilk it's
arguments[3]
why is it showing wrong
okay so here arguments is like a keyword of accessing the arguments?
@manaraj you have to use only one side of the table, the codes, not the words too
@JKilk yes
ok I see now, first separate arguments from array. Create a variable containing only the array
okay that makes a lot of sense thank you very much
@JKilk
Ok thanks Diego
@etacalpha the array comes as the function param, for free ;)
how do i give points for helping ?
saying thanks and mention someone
thanks @Chrono79 for helping me
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no problem
I have a question about Selecting many options from switchs. I cant get my test to ready out the statement.
your code please
switch (val) {
case 1:
console.log("alpha");
break;
case 2:
console.log("beta");
break;
case 3:
console.log("gamma");
break;
case 4:
console.log("delta");
break;
}
case 1:
console.log("alpha");
break;
case 2:
console.log("beta");
break;
case 3:
console.log("gamma");
break;
case 4:
console.log("delta");
break;
}
// Example
var ourStr = "I come first. ";
ourStr += "I come second.";
// Only change code below this line
var myStr = "This is the first sentence. " + "This is the second sentence.";
I know I'm not krazy with this one...
// Setup
var testObj = {
12: "Namath",
16: "Montana",
19: "Unitas"
};
// Only change code below this line;
var playerNumber = testObj[playerNumber]; // Change this Line
var player = testObj[16]; // Change this Line
@mrburks do it like the example, in 2 lines
What am I missing? The last thing that won't complete is "playerNumber should be a number"
function titleCase(str) {
var result;
var arr = str.toLowerCase().split(' ');
arr.map(function(val){
console.log(val.replace(val[0],val[0].toUpperCase()));
result = val.replace(val[0],val[0].toUpperCase());
}
);
return result;
}
titleCase("I'm a little tea pot”);
@nede36 playerNumber must be a number and you have to use playerNumber in the last line
@Chrono79 yes but he will still have to slice in order to use arguments
@jaywikid are you sure you have to console.log?
@etacalpha no need, he could loop over arguments
@Chrono79 I tried it without it and it still doesnt return anything
@jaywikid challenge name?
but what number, the only numbers are what are in the object which is what I am calling. I'm super confused
@Chrono79 Selecting from many options with Switch Statements
@nede36 look at the instructions, you'll figure out what number do you need
but the idea of the challenge is to use the filter method
I know the number I need is 16
@etacalpha yes, with the array
loop through arguments, and filter the array, it can be done like that
loop through arguments, and filter the array, it can be done like that
@nede36 so, set playerNumber to 16
Got it, I was overthinking
thanks @Chrono79
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@Code-Eric you're overwriting result in each loop
Hi. Do you all know how many challenges are required to be able to maintain a streak? I have been trying to do it every day for the past week yesterday I completed 4. Today I completed 1 and today I noticed it reads 1 day streak???
@caep2015 I think they're for hours, not challenges, so maybe between a challenge and another passed more than 24hs
@caep2015 "If you get Brownie Points on several days in a row, you'll get a streak."
how do i fix the problem?
@caep2015 - I think that if you get one brownie point or complete one challenge in a day, it counts toward to streak? It seems like that to me, although I don't have an easy time remembering the numbers, but I'm on a 174 day streak, so it's been going for a while. I usually get more than one BP a day from helping people - but completing a challenge for the first time (a lesson, or whatever they are called) also gives you a point. It shows that you are active for that day.
@Code-Eric - you want to store the results in an array in some manner (just as you are reading them from an array) so that you have a complete set of the words to re-build the sentence.
i got it nvm
i pushed it into a new array and then joined it
yeah exactly what you said @khaduch
Can someone explain to me why my code wont read out anything?
@Code-Eric - good! It's kind of a pattern with a lot of these exercises, so you'll see it again, for sure.
function caseInSwitch(val) {
var answer = "";
// Only change code below this line
switch (answer) {
case 1:
console.log("alpha");
break;
case 2:
console.log("beta");
break;
case 3:
console.log("gamma");
break;
case 4:
console.log("delta");
break;
}
// Only change code above this line
return answer;
}
// Change this value to test
caseInSwitch(1);
I'm trying. It definitely keeps me coming back so that I don't loose my "streak". Today was a big day so I kind of wanted to call it a night after 1 challenge so I checked the streak and was dismayed at the streak = 1 day. Was wondering wondering if I should keep going for it to continue. I have been on here every day for the past 5 days so today would have been day 5 (not 1)....
@jaywikid - you are returning the value in the variable
answer, but you are not setting anything in it. And you are doing switch(answer) instead of using the val...
@jaywikid evaluate val, not answer
@Chrono79 I already tried it like the example, that didn't work. maybe and browser restarted will work...
@khaduch Thanks
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@jaywikid answer is a string, your cases are ints
@caep2015 - if you want to do another quick item that should get you a point, look at the bottom of the map for the videos on Computer Basics or Javascript L ingo - they are short and helpful videos with a few questions to answer. Give that a try!
@caep2015 - I'll give you a thanks for the interaction - always good to get some feedback!
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@khaduch thanks again for the feedback and advice I will check out the videos and come back tomorrow morning.
i changed it to Switch(val) and i still get no read out.Shoould i not be using console.log?
:warning: caep2015 already gave khaduch points
QUESTION:: Im trying to write something that looks at the value of TIll and counts it to see if the till has sufficient funds to cover change...
How do i access the numbers so I can count it or is it possible?
How do i access the numbers so I can count it or is it possible?
function checkCashRegister(price, cash, cid) {
var cost=arguments[0];
var money=arguments[1];
var till= arguments[2];
var count=0;
var change= money-cost;
for(var i in till){
count+= till[i].hasOwnProperty(val);
if(change>count){
return "Insufficient Funds";
}
}
return count;
}caep2015 sends brownie points to @khaduch :sparkles: :thumbsup: :sparkles:
@jaywikid yes, you should change answer value instead
@mrburks show your code again if reset or refresh doesn't work
@Chrono79 i changed the answer value in switch(xxx), still no read out
@123xylem why use vars to change the name of arguments ? Use an IF Else to do that
@jaywikid paste your code again
@Chrono79 function caseInSwitch(val) {
var answer = "";
// Only change code below this line
switch (val) {
case 1:
console.log("alpha");
break;
case 2:
console.log("beta");
break;
case 3:
console.log("gamma");
break;
case 4:
console.log("delta");
break;
}
// Only change code above this line
return answer;
}
still not working
@jaywikid You are
console.loging the answers. Instead, try to set answer = to each case so that when you return answer at the bottom it’s not empty.
@etacalpha what does it matter how I change arg names?
case 1:
answer = "alpha";
@Chrono79 @bsandusky thanks for the help
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its extra code not needed, not saying your wrong for it just kinda repetative
@123xylem
@mrburks paste it again
Howdy everyone. I think my Simon game is very close to completion. Can you please play it and tell me what flaws you find? Thank you! http://codepen.io/micahbales/pen/MegRqm?editors=0010
@etacalpha Man I like to have it refined but at the moment I just want to be able to actualy code it:)
if price - cost > cid return INS else return (price - cost) +" is your change" @123xylem
// Example
var ourStr = "I come first. ";
ourStr += "I come second.";
// Only change code below this line
var myStr = "This is the first sentence. ";
ourStr += "This is the second sentence.";
oh, i see it now
:+1:
@etacalpha nice and short... Any idea how I access the CID numbers though?
it's already there as an argument @123xylem
@etacalpha cid is an array though.. It doesnt have 1 numerical val it has a few with strings aswell
what is the name of the challenge?
exact change
var change= money-cost;
for(i=1; i<till.length;i+2){
count+= till[i];
if(change>count){
return "Insufficient Funds";
}
}
return count;
}
cid=[["PENNY", 1.01], ["NICKEL", 2.05] etc
for(i=0; i<till.length;i++){
for(j=1;j<till[i].length;j+2){
count+= till[j];
if(change>count){
return "Insufficient Funds";
}}
}
return count;
I made a nested loop that looks at 2nd elem of array and adds to count
then i can compare the val of count with change needed
But its giving infi loop...
@123xylem I have not seen this one before give me a few
@etacalpha sure!
@123xylem why the second loop, and what is till?
@Chrono79 the second loop is to access the number in cid/till
till is the array of money in the till
@Chrono79 till is another name for cash register
ok
o yea and that
Is there an easy way to stop that infi loop... I always get caught up on how to stop them
hey guys, can you not use a for loop in the callback function of filter?
if you have cid, that's the array, why not use only one loop, and sum
cid[i][1]?
@micahbales - hello Micah - what is "strict" mode supposed to do? It doesn't seem to be any different from the normal mode?
It looks pretty good - sometimes the sounds don't play on repeated occurrences of the same color? And when I messed up on my round, I was expecting some kind of explosion or something? :)
@khaduch Strict makes it so that the game resets if you mess up. Otherwise, you get to re-try.
@khaduch you just killed a kitten :crying_cat_face:
@micahbales - oh, I thought it was something different, but it's been a long time since I played a simon game...
@khaduch I noticed that problem with the sounds, too. It's happened when I click very quickly. I'm wondering if it's because of the "bounce" effect
I'm also noticing an occasional out-of-control glitchiness that happens at what seems like random times. Not sure what's causing that.
@Chrono79 - oh no!!!! :frowning:
function destroyer(arr) {
var destroyers = [];
for(var i = 1; i < arguments.length; i++){
destroyers.push(arguments[i]);
}
var destroyedArr = arr.filter(function(arrayValue){
for(var i = 0; i < destroyers.length; i++)
return arrayValue != destroyers[i];
});
return destroyedArr;
}
@JKilk return break the loop
so it only looping once
so it only looping once
yes agreed
usually u only return true OR false insode the loop conditionally...
and the oposite value. outside the loop
and the oposite value. outside the loop
@micahbales - it is probably some kind of instability in using the setTimeout (not sure if that's the correct term, but that's the idea) - I think that things can affect the operation of the setTimeout for triggering, if the CPU is busy or something? I kind of read through the docs one time and remembered something like that?
@khaduch think there's a solution to it?
ie:
for (...
if (some condition )
return true
// after loop
return false@JKilk
is anyone else having issues with the help window?
sometimes bringing in code with back ticks and shift enters works fine but others it's like it doesn't take
chat mode vs compose mode maybe ?? ---------------------------------------------------------------------------------------->>>>
@micahbales = there is a description on this page https://developer.mozilla.org/en-US/docs/Web/API/WindowTimers/setTimeout "Reasons for delays longer than specified" that talks about a number of different issues. Not sure if there is a real problem in this way with your app, or if there is a solution? Maybe not using setTimeout would be a solution? I don't really have the understanding of how your code works, but it seems like there are a lot of setTimeout calls - I wouldn't be surprised at some bad interactions there? Again, without really being an expert, it's just a gut feeling...
@khaduch There are a ton of setTimeout calls. Is there an alternative you're aware of? Just using what I know! :)
@gkcodeman - it seems to work, in general. There are times when it does things that violate the principle of least astonishment (as a former co-worker of mine used to say) - like when you get into editing a post and you are not in chat mode, it still posts when you hit enter, etc... And like @moigithub said - there are the two modes that give different types of interaction.
can anyone point me to some information about passing functions as parameters to functions?
yeah it's def off and on
- on the 'Finders Keepers'
anyways I'm going to try to post my issue again
@CurlyWS it's like you had written the function passed as a parameter inside your function
function testGreaterThan(val) {
if (val) { // Change this line
return "Over 100";
}
if (val) { // Change this line
return "Over 10";
}
return "10 or Under";
}
// Change this value to test
testGreaterThan(10);
ugh finally
so I'm not getting what this is asking me to do. It wan't me to: Add the greater than operator to the indicated lines so that the return statements make sense.
@CurlyWS - you just do something like
findElement([ some array ], function( arg ) { code }); - it is the callback function for the filter method.
@gkcodeman how would you write Over 100 with > ?
@gkcodeman so you would say
```
if(val>100){}
if(val < 10){}
```
if(val>100){}
if(val < 10){}
oh ;/ smh
sometimes it's just that easy and I have to go and make it harder
@CurlyWS @Chrono79 thanks
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I was thinking I had to pass the correct argument into the parameter that would cover all the basis which I knew off the top wasn't possible
*bases
@khaduch so how do you reference the parameter function within the outer function???
hey guys im in "Target the same element with multiple jQuery Selectors" but stuck on add only one class at a time to the same element three different ways. Any tips on this one would be appreciated
@micahbales - good question. I haven't done this challenge yet - I just started tinkering with setting up the display, because I don't know how to do that. But I was thinking that using
setInterrupt and having some type of "event queue" would be a more consistent way of controlling the behavior? That's just another gut feeling - I'll see what happens when I get around to coding on this one! :)
good point
wait so I couldn't ref that parameter unless it is within that function correct
@CurlyWS ?
due to scoping
@gkcodeman let me try to reword my question hang on
@CurlyWS - it is a function argument - in my editor for this one, I have this:
function findElement(arr, func) {, so func will be the value of the function that you pass in, and you just use that as the callback, instead of writing Array.filter( function( value ) { whatever you are doing here; });
<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
<style>
.red-text {
color: red;
}
h2 {
font-family: Lobster, Monospace;
}
p {
font-size: 16px;
font-family: Monospace;
}
.thick-green-border {
border-color: green;
border-width: 10px;
border-style: solid;
border-radius: 50%;
}
.smaller-image {
width: 100px;
}
</style>
<h2 class="red-text">CatPhotoApp</h2>
<img class="smaller-image thick-green-border" src="https://bit.ly/fcc-relaxing-cat">
<p class="red-text">Kitty ipsum dolor sit amet, shed everywhere shed everywhere stretching attack your ankles chase the red dot, hairball run catnip eat the grass sniff.</p>
<p class="red-text">Purr jump eat the grass rip the couch scratched sunbathe, shed everywhere rip the couch sleep in the sink fluffy fur catnip scratched.
</p>
man this looks so simple now after messing with js
html /css you are so pretty
: )
Can somebody tell me why my getQuote function isn't executing when I click <button> ?
<script>
$(document).ready(function() {
$("button").addClass("animated shake btn-primary")
$(".btn").addClass("animated shake btn-primary")
$("#target1").addClass("animated shake btn-primary")
});
</script>
<!-- Only change code above this line. -->
<div class="container-fluid">
<h3 class="text-primary text-center">jQuery Playground</h3>
<div class="row">
<div class="col-xs-6">
<h4>#left-well</h4>
<div class="well" id="left-well">
<button class="btn btn-default target" id="target1">#target1</button>
<button class="btn btn-default target" id="target2">#target2</button>
<button class="btn btn-default target" id="target3">#target3</button>
</div>
</div>
<div class="col-xs-6">
<h4>#right-well</h4>
<div class="well" id="right-well">
<button class="btn btn-default target" id="target4">#target4</button>
<button class="btn btn-default target" id="target5">#target5</button>
<button class="btn btn-default target" id="target6">#target6</button>
</div>
</div>
</div>
</div>@khaduch ok I almost understand I think
but with this code,
function findElement(arr, func) {
console.log(num);
}
findElement([1, 2, 3, 4], function(num){ return num % 2 === 0; });can you explain at what point the function takes 'num'. Do you have to declare num from outside the function? what if you never declare it?
sorry pasted wrong one
@PeRoXiiDe - is there supposed to be some
<script> in there? I forget - I'll have to go and look at that challenge...
I'll have to take a look at
setInterrupt. Thanks, @khaduch
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@khaduch second one posted had the $
@khaduch yeah sorry i pasted the wrong code I went to the regular help room first
@PeRoXiiDe - okay. You have to only have one class listed in each
.addClass() method, as per the instructions. Not all three in each one.
@PeRoXiiDe it only wants you to add one class each time, you are adding 3
@PeRoXiiDe does the base class .btn actually need to be manipulated in that problem? I can't remember
@PeRoXiiDe - there are three different ways to "target" the elements:
- "button" - will select all button element (first way)
- ".btn" - will select all elements with the class
.btn(second way) - "#target1" - will select the element (should only be one element, IDs are unique) with that ID - (third way)
One class in each of the selectors.
hey so i finished seek and destroy challenge but i'm curious what other solutions people came up with, is there a way i can browse them?
@JKilk congrats on completing it, hope to be there soon
@JKilk PM me yours and ill PM you mine
@khaduch yikes ok so are you saying I should choose one of these three
@JKilk - I don't know if you can browser other's solutions - you might be able to accses their freecodecamp.com page. If you want to look at some recommended solutions, check the wiki for that challenge - they usually provide hints and "spoilers" with the best solutions.
Can someone help me with Return Early Pattern for Functions?
not quite sure what its wanting me to do....
cool will do Ken thanks, also will PM you david
function reverseString(str) {
return str;
}
var arr=[];
var str="";
str=reverseString("hello");
arr=str.split().reverse();
str=arr.join();
@PeRoXiiDe - no, the challenge is to use all three, but with a different class in each one.
Add the animated class to all elements with type
button.Add the shake class to all the buttons with class
.btn.Add the btn-primary class to the button with id
#target1.
You have the selectors, you just have to remove the extraneous classes from each one.
what's wrong of my code
@CurlyWS you get busy? were you wanting to rephrase question still?
ken how do i PM you lol
it is asked to turn a string to an array then reverse it, finally turn the array to a new string
checkCashRegister(20.50, 20.00, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.10], ["QUARTER", 4.25], ["ONE", 90.00], ["FIVE", 55.00], ["TEN", 20.00], ["TWENTY", 60.00], ["ONE HUNDRED", 100.00]]);I have tried a nested for loop but cant seem to get it working.. Any Idea how to make count+= the numbers in these arrays?
hey @Leodhy i dont think reverseString() is a function
@Leodhy - the code that you are writing should be within the curly braces of the
function reverseString body.
what you want to do is convert the string into an array, reverse the array, convert back to string
@JKilk i just invited you to a private room with my solution
okay thanks david how do i go about accessing that
thank you guys, i should write the code in the function
click on the icon to the left that looks like a person
make sure to thank them followed by their @name that way they get points if you can
gkcodeman sends brownie points to @name :sparkles: :thumbsup: :sparkles:
:warning: could not find receiver for name
not to be bossy, I just know I appreciate it when people do :)
how do i make a val less than 0 show as undefined?
make an uninstantiated variable and return it following an if statment for <0 maybe
honestly can't figure out how to access your private room and its really demoralizing me
function destroyer(arr) {
// Remove all the values
var args = Array.from(arguments);
args.splice(0,1);
return arr.filter(function(e){
return args.indexOf(e) === -1;
});
}
destroyer([1, 2, 3, 1, 2, 3], 2, 3);
Heres my challenge Return Early Pattern for Functions
@khaduch Wow thanks, I was reading that all wrong. Think its probably time to go to sleep. Thank you, thank you, thank you
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ah okay i did something similar, i was mostly curious if there was a different way to do it other than using indexOf
thanks @Byzgig
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@gkcodeman @khaduch ok I almost understand I think
but with this code,
function findElement(arr, func) {
console.log(num);
}
findElement([1, 2, 3, 4], function(num){ return num % 2 === 0; });can you explain at what point the function takes 'num'. Do you have to declare num from outside the function? what if you never declare it?
@CurlyWS just do func(10), for example
Howdo I get a - var to read out as NaN in this equation?
// Setup
function abTest(a, b) {
// Only change code below this line
// Only change code above this line
return Math.round(Math.pow(Math.sqrt(a) + Math.sqrt(b), 2));
}
// Change values below to test your code
abTest(2,2);
@CurlyWS num is the param of that function, it's already declared there
@mauriciocoder @Chrono79 It seems I havn't had enough sleep easy stuff thanks
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Can anyone tell me why source[j] returns undefined in this code?
function whereAreYou(collection, source) {
// What's in a name?
var arr = [];
// Only change code below this line
//console.log(Object.keys(collection).length);
for (var i = 0; i < Object.keys(collection).length; i++) {
for (var j = 0; j < Object.keys(source).length; j++) {
console.log(collection[i], source[j]);
}
}
// Only change code above this line
return arr;
}
whereAreYou([{ first: "Romeo", last: "Montague" }, { first: "Mercutio", last: null }, { first: "Tybalt", last: "Capulet" }], { last: "Capulet" });
@PeRoXiiDe - sometimes it does get to be a little hard to see what's going on. It is helpful to study the test cases and results - they tell you things that you might not have gotten from the first reading through the instructions, I've found that to be very helpful for some of the challenges where I just was not getting it... :)
@CurlyWS You can pass whatever number you want, just calling func(10), or func(12), or func(numberThatYouInitializedBefore)...
@ConnHurr Source isn't an array?
@ConnHurr yes, that's why @HassHz
@ConnHurr source is an object not an array, in order to reach it, you may use another approach
@ConnHurr because if Object.keys(source) does not exist then it will return undefined.
so for your function call source is last:"Capulet". If capulet is not found then it will throw undefined
I assume it is something to do with that
console.log each stage so you can identify the problem
so for your function call source is last:"Capulet". If capulet is not found then it will throw undefined
I assume it is something to do with that
console.log each stage so you can identify the problem
@CurlyWS - if you read the description of the
filter method, you'll see that it always passes some parameters when it calls the callback. The first one (if I remember correctly) is the number or the array element that you are work on - the value of that array element.
@jaywikid reread that challenge instructions
@ConnHurr I did something to deal with that some time ago, just take a look: ''' var pages = data.query.pages;
var links = "";
for (pageId in pages) {
var extract = pages[pageId].extract; '''
var links = "";
for (pageId in pages) {
var extract = pages[pageId].extract; '''
:bulb: to format code use backticks! ``` more info
@khaduch I don't understand. Why is the filter method relevant to the task?
@Chrono79 the instructions are "Modify the function abTest so that if a or b are less than 0 the function will immediately exit with a value of undefined."
Okay thanks guys i'll find a work around
@CurlyWS - isn't it? I forget which one we are looking at, perhaps?
the only thing is both collection and source are associative arrays and it works for collection but not source
not sure what functions to use
@khaduch possibly it suggests using it in 'Finders Keepers'
Wait nveermind I see the error
@CurlyWS - yes, it suggests using it - I'm not sure what they give you to start with?
@ConnHurr When you use
for (key in object) you have the key of the object as a variable, so you just need to do object[key]
@jaywikid yes, so why did you said this: Howdo I get a - var to read out as NaN in this equation?
I think I get it now, look the square root of a number less than 0 gives you NaN
So you have to catch a or b less than 0 before that calculation and return undefined
you have to write an if with 2 conditions joined with a logical operator
I think I get it now, look the square root of a number less than 0 gives you NaN
So you have to catch a or b less than 0 before that calculation and return undefined
you have to write an if with 2 conditions joined with a logical operator
@ConnHurr Do you see what I mean?
@CurlyWS - oh, yeah, you're supposed to use it, at least they suggest (recommend) it?
@Chrono79 so write an if thats a<0 and one thats b<0?
@khaduch this is what I just solved the bonfire with,
function findElement(arr, func) {
for(var i in arr){
if (func(arr[i])){
return arr[i];
}
}
}
findElement([1, 2, 3, 4], function(num){ return num % 2 === 0; });
@mauriciocoder so is this valid then if I wanted to try to do something similar:
for (var i = 0; i < Object.keys(collection).length; i++) {
for (var j = 0; j < Object.keys(source).length; j++) {
console.log(collection[i], Object.keys(source)[j]);
var test = Object.keys(source)[j];
console.log(test, collection[test]);
}
}
@CurlyWS - but you could do this without
.filter I guess. Like what you did, if it passes, it's good!
I mean to ask if I can access collection[test]?
Its giving me undefined but I feel like I have the right logic
@khaduch yeah so did you do it using filter? can I see how you did it?
@jaywikid no, only one with both conditions
@CurlyWS - these are the key lines from my solution:
num = arr.filter(func);
return num.shift();since filter returns an array, and we want to return the first element, I shift it off. I could probably simplify that to one line?
@khaduch great makes sense. Thanks I appreciate it
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@CurlyWS
return arr.filter(func).shift();@khaduch maybe write
return arr.filter(func).shift();?
@CurlyWS :) I just did... :)
@khaduch yes,
return arr.filter(func)[0]; it's another way of doing the same
@khaduch :P good stuff
@CurlyWS @Chrono79 - and you can also use
[0] as Diego shows. Is that better, @Chrono79 ?
dunno, I think they're the same
I assume faster
As probably my original method was. Although looks primitive compared to this elegant filter solution
@CurlyWS what is the bonfire name?
for which u provide solution
above
I think it was finders keepers
can someone explain how to use String.fromCharCode()? im just really not understanding the documentation
@Chrono79 thx
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@dcgoings "A".charCodeAt(0) is 65 and String.fromCharCode(65) is "A"
@CurlyWS - I think that sometimes the "elegant" solutions are much slower than the straightforward
for loop solutions - at least I saw someone posting something about that in some forum or text book. But I think that the statement was made that you shouldn't worry about speed unless you need to - I'm sure that if you're processing a million records or something, it's significant.
@khaduch that's true
@khaduch did you use the Filter method also in the next task? 'Drop It?'
@khaduch I'm heading towards just using another loop but am curious to whether you managed to employ it again. Because filter return an array right?
@Chrono79 that makes a bit more sense, however, how would i combine multiple fromCharCode() to one string?
@CurlyWS - no, I didn't - the fanciest thing I used was
and a
.shift()and a
while loop
@dcgoings you could use a loop
@khaduch I think that is appropriate here also
like.. in my head, i keep wanting to do something like
var decoded = "";
decoded += String.fromCharCode(str.charCodeAt(i+13));"
but i feel like that's giving me errors
@dcgoings it's something along them lines
hmm
@dcgoings you're doing the +13 wrong
@dcgoings there is really clever way of doing this using the % operator. Where the code cycles around the 26 alphabet characters
@CurlyWS yeah, i did that in my java class.. but im still getting used to js and didn't want to push that idea just yet.
@Chrono79 how so?
you first get the code and then add (or substract) the 13
oh nvm
khaduch @khaduch - fading out here... :sleepy: - going to move along for the night... happy coding everyone!!!!
bye
@dcgoings I think I just did it using if statements.
So if(char < 26) add 13)
else{// char is higher than 13 add however much you can reset char to 1 then add what is left
So if(char < 26) add 13)
else{// char is higher than 13 add however much you can reset char to 1 then add what is left
sorry I made an erro
if(char <13){ add 13}
maybe that helps
they are between 65 and 90, the capital letters code, but the idea is right, if substracting 13 it falls below 65 you should add 13 instead
@khaduch @CurlyWS i think this one is better
function findElement(arr, func) {
for(var i = 0, len = arr.length; i < len; i++) {
if(func(arr[i])) return arr[i];
}
return;
}@dagman yeah very similar to my original solution
for(var i in arr){
if (func(arr[i])){
return arr[i];
}
}but less elegant than using filer
*filter
@CurlyWS it is not the same
@CurlyWS filter would be longer
@dagman it's the same (I think your 2 solutions from above)
@dagman filter is different. My solution provided above is the same as yours. Perhaps slightly faster
jesus
function rot13(str) { // LBH QVQ VG!
var decoded = "";
for (var i = 0; i < str.length; i++) {
if (str.charCodeAt(i) >= 65 && str.charCodeAt(i) <= 77) {
decoded += String.fromCharCode(str.charCodeAt(i)+13);
}
else if (str.charCodeAt(i) >= 78 && str.charCodeAt(i) <= 90) {
decoded += String.fromCharCode(str.charCodeAt(i)-13);
}
else {decoded += String.fromCharCode(str.charCodeAt(i));
}
}
return decoded;
}
// Change the inputs below to test
rot13("SERR PBQR PNZC");
at least it works
but fml
@dcgoings why fml man?
i feel like there are 10x more efficient ways of doing some of these algs compared to the way i did it
@CurlyWS yep your solution much better then what filter do
@CurlyWS so u d better stick with yours
@dcgoings yeah I felt the same. There is a way of using modulus but I havn't found a way of even searching for that content yet
can anyone here explain how to cycle through the alphabet +13 using %???
I will find the example I saw
i did it in my java class, cant remember exactly though
@dcgoings what is bonfire name?
caesars cipher
@CurlyWS
65+(str.charCodeAt(0)+13)%65%13
@chaitanyaashtekar that's it. I don't really understand it though
str.charCodeAt(0)%26+65
if str.charCodeAt(0) is 65, 65%26 is 13 + 65, so A -> N
if str.charCodeAt(0) is 90, 90%26 is 12 + 65 = 90 -13, so Z -> M
if str.charCodeAt(0) is 65, 65%26 is 13 + 65, so A -> N
if str.charCodeAt(0) is 90, 90%26 is 12 + 65 = 90 -13, so Z -> M
i did this
function rot13(str) {
return str.split('').map(function(el) {
var code = el.charCodeAt(0);
if(code >= 65 && code <= 90 || code >= 97 && code <= 122){
return String.fromCharCode(getCorrectCode(el.charCodeAt(0) + 13));
}
return el;
}).join('');
function getCorrectCode(n) {
return n > 90 ? n = n - 26 : n;
}
}
In ruby there is a string method called tr, that does it like this:
def rot13(value)
return value.tr("a-z", "n-za-m")
end
lol of course there is
Word Blanks - Not really understanding what they want me to do.
@mrburks Read Mad Libs link and review this challenge: https://www.freecodecamp.com/challenges/constructing-strings-with-variables
yeah I tried it that way and still nothing
var newStr = "This is a " + myNoun + "about the lorem and the ipsum. They were "+ myAdjective +"Travelers of time and space. However the lorem " + myVerb +"too fast for the Ipsum and left the ipsum behind. So the ipsum had to catch up " + myAdverb +"in order to keep up with the Lorem.";
am I supposed to break it into several smaller strings because I tried that first
@mrburks you're missing some spaces
and should the name of the var be newStr?
myNoun + "abou after the " for instanceand should the name of the var be newStr?
that is because the space is at the end of the prev string
I don't know what the name of the var should be
@mrburks no, that space is before the string contained in myNoun
help word blanks
:point_right: challenge word blanks [wiki]
Challenge Word Blanks
We will now use our knowledge of strings to build a "Mad Libs" style word game we're calling "Word Blanks". You will create an (optionally humorous) "Fill in the Blanks" style sentence.
:pencil: read more about challenge word blanks on the FCC Wiki
var result = "";
// Your code below this line
// Your code above this line
return result;
when you join strings with vars, you have to leave spaces before and after the var
it seem like they want me to use the var result but that var is already define in the section Not where my code is to go.
@mrburks just use it, it's there for you to use it
didn't work
@mrburks let's see your code again
function wordBlanks(myNoun, myAdjective, myVerb, myAdverb) {
var result = "";
// Your code below this line
var result = "This is a " + myNoun + "about the lorem and the ipsum. They were "+ myAdjective +" travelers of time and space. However the lorem " + myVerb +" too fast for the Ipsum and left the ipsum behind. So the ipsum had to catch up " + myAdverb +"in order to keep up with the Lorem.";
// Your code above this line
return result;
}
// Change the words here to test your function
wordBlanks("cat", "little", "hit", "slowly");
function titleCase(str) {
str.toLowerCase();
return str;
}
titleCase("I'm a little tea pot");
@mrburks no need to declare result again, delete var, you haven't added the spaces where I told you to
why the result of this program cannot be lowercased
@Leodhy toLowerCase() returns a different string, it doesn't modify str
yeah that didn't work either
function wordBlanks(myNoun, myAdjective, myVerb, myAdverb) {
// Your code below this line
var result = "This is a " + myNoun + "about the lorem and the ipsum. They were "+ myAdjective +" travelers of time and space. However the lorem " + myVerb +" too fast for the Ipsum and left the ipsum behind. So the ipsum had to catch up " + myAdverb +"in order to keep up with the Lorem.";
// Your code above this line
return result;
}
// Change the words here to test your function
wordBlanks("cat", "little", "hit", "slowly");
ok.thx
Im trying to write code for reverse of a string . Can you please tell me what is wrong with this?
function FirstReverse(str) {
var reverse;
for(i=0;i<str.length+1;i++){
reverse[i] = (str[str.length-i]);
}
return str;
}
FirstReverse('Hello world');
@mrburks go back to your previous version, delete var before result = "This is a " + myNoun + "a...
Not the var result = ""; above your code
And for God's sake, add the spaces pretty please
Not the var result = ""; above your code
And for God's sake, add the spaces pretty please
Hello im in the random quote challenge, any help pls
0_o
@mrburks
"about <-here
"in order to keep <- here
"about <-here
"in order to keep <- here
see the " touching the text?
return str.split().reverse().join();
@vamshikrishna144
@vamshikrishna144 if you return str, what are you using reverse for?
@Chrono79 return reverse;
my bad
@NixonRichard that's no good
@NixonRichard I know it can be done in that way but I want to do it this way
@vamshikrishna144 also, use strings if you use a loop
@NixonRichard THank you though
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@vamshikrishna144 use += to add a letter
@Chrono79 thank you
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yeh
@NixonRichard you forgot the "" where they're needed
oh right
ok i guess spacing was an issue thanks @Chrono79
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@mrburks no problem
im having problems with check for palindromes
code or treat
I guess I should save that for Halloween
every explanation s in english
really tough to understand
a palindrome is a word (or a group of words) that (cleaned of all that's not a letter or a number) could be read the same from left to right or right to left
Not that i mean the code s explantion
The toLowerCase() method to return the calling string value converted to lowercase.
The replace() method to return a new string with some or all matches of a pattern replaced by a replacement. We will use one of the RegExp we just created earlier.
The split() method splits a String object into an array of strings by separating the string into sub strings.
The reverse() method reverses an array in place. The first array element becomes the last and the last becomes the first.
The join() method joins all elements of an array into a string.
do you know what each method does?
@
toLowerCase converts things into lower cases ?
yes
@NixonRichard what your language ?
Vietnamese
okay
i dont understand the replace
split reverse and join s okay
just the replace
do you know what replace means?
it changes one thing for other
yes
in this case, you need to get rid of all that's not a letter or a number, like punctuation, spaces and such
@Chrono79 i think he doesnt understand how it works(RegExp)
well, that's not what he said, but could be, that's the most strange thing there
@NixonRichard have you read the regular expressions chapter man ? its available in many languages. here https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions
@Chrono79 yup/many ppl have difficulting in grasping rgular expressions
ya
do i have to get how it works or just what it does ?
@NixonRichard you have to understand how it works
It helps me code better ?
yup
Okay then
thx guyz
Accessing Nested Objects in JSON
Why isn't this answer working? var gloveBoxContents = "myStorage['glove box']";
Why isn't this answer working? var gloveBoxContents = "myStorage['glove box']";
Which book can have as reference for JavaScript? Any guidance pls...
what iswrong in below code of search and replace:
function myReplace(str, before, after) {
var After=after.split("");
if(before.charCodeAt(0)>95 && before.charCodeAt(0)<123 )
str=str.replace(before, after);
else if(before.charCodeAt(0)>64 && before.charCodeAt(0)<91){
if(after.charCodeAt(0)>64 && after.charCodeAt(0)<91){
str=str.replace(before, after);
}
else {
After=After.splice(0,1,String.fromCharCode(after.charCodeAt(0)-32));
After=After.join("");
str=str.replace(before,After);}
}
return str;
}
myReplace("A quick brown fox Jumped over the lazy dog", "Jumped", "leaped");
@kksrini89 the missing manual is good book
anyone ???
can someone explain to me this code for flattening an array,
var falttened = [].concat.apply([], arr);what is the first parameter in apply doing (the [ ]) ? it doesn't seem to be doing anything?
@himanshu081996 oh ok fine. Will wait some more comments on that from campers.
@96street "myStorage['glove box']" is a string
myStorage['glove box'] is missing some other properties between myStorage and ['glove box']
myStorage['glove box'] is missing some other properties between myStorage and ['glove box']
ah yep you're right
How to I get my quoteGenerator to tweet the actual quote and not the codepen? http://codepen.io/kingdezz/pen/mEJPLN/
I learned something new today
@CurlyWS, I would look up the concat & apply methods ... my guess it, it is initializing the array to an empty array ...
only one, @mafelix ?
only one?
ya only one.
@kksrini89
help javascript resources
no wiki entry for:
javascript resources
help javascript
:point_right: challenge add new properties to a javascript object [wiki]
Add New Properties to a JavaScript Object
You can add new properties to existing JavaScript objects the same way you would modify them. Here is how:
myDog.bark = "woof-woof";:pencil: read more about challenge add new properties to a javascript object on the FCC Wiki
^^^ @kksrini89
oops ... wrong
dang it ...
This message was deleted
no wiki entry for:
javascript resource
This message was deleted
help js resources
:point_right: js resources [wiki]
JavaScript Tutorials and other Resources
- JavaScript for Cats
- Professor Frisby's Mostly Adequate Guide to Functional Programming
- Eloquent Javascript (annotated)
- Speaking Javascript
- Exploring ES6
- Udemy - Javascript Understanding the Weird Parts (first 3.5 hrs)
finally ... ^^^^ @kksrini89
Is anyone here working on the backend projects?
@bitgrower oh nice
@Zamua there is a backend room ...
help rooms
:point_right: help rooms [wiki]
FreeCodeCamp Chat Rooms
Help Rooms
| Chat Room Description | Chat Room |
|---|---|
| HTML/CSS/Bootstrap | FreeCodeCamp/Help |
| JavaScript/Algorithms | FreeCodeCamp/HelpJavaScript |
| Front End | FreeCodeCamp/HelpFrontEnd |
| Data Visualization | FreeCodeCamp/HelpDataViz |
| Back End | FreeCodeCamp/HelpBackEnd |
Choose the right room for your questions!
See also: :earth_asia: Language Specific | :satellite: Technology | :crystal_ball: Miscellaneous
@bitgrower thanks! <33
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yw !!!
it won't be as active as this one, in general, but when folks are there, you'll usually find people who know exactly how to help you -- here, it's a bit more hit or miss ...
ahh gotcha, i'll check it out a couple times a day and see if anyone can help me out haha
This message was deleted
Sorry, can't find a bonfire called falsy bouncer remove all falsy values from an array could this lead 2 a solution why doesnt it work yet. [ Check the map? ]
Nesting For Loops
getting Erros
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[i];
}
}
// Only change code above this line
return product;
}
// Modify values below to test your code
multiplyAll([[1,2],[3,4],[5,6,7]]);
Bonfire, Falsy Bouncer, "Remove all falsy values from an array." Could this lead 2 a solution? & why doesn't it work (yet?) function bouncer(arr) {
for(var i=0; i<arr.length;i++){
if (new Boolean(arr[i])=false)
arr[i]=false;
}
}var arrFiltered = arr.filter(bouncer);
return arrFiltered;
bouncer([7, "ate", "", false, 9]);
Sorry, can't find a bonfire called falsy bouncer remove all falsy values from an array could this lead 2 a solution why doesnt it work yet function bouncerarr forvar i0 iarrlengthi if new booleanarrifalse arrifalse var arrfiltered arrfilterbouncer return arrfilteredbouncer7 ate false 9. [ Check the map? ]
@krishnakumar360 use product= product*arr[i][j];
This message was deleted
@himanshu081996 Thanks Bro
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onfire, Falsy Bouncer, "Remove all falsy values from an array." Could this lead 2 a solution? & why doesn't it work (yet?)
@1koenvdp use filter
@himanshu081996 I did allready-I guess? I wrote arr.filter(bouncer)
you are not using filter correctly @1koenvdp
go through links provided by your challenge @1koenvdp
@himanshu081996 ok, I'll look at it, hopefully I'll see what's wrong
yup u will c
@himanshu081996 I'm sorry. I really don't see what's wrong :-S
@1koenvdp don't need
new I think
= vs ==
hello, for the collection record challenge, I have the function set up like this:
function updateRecords(id, prop, value) {
if (value !== "" && prop !== "tracks"){
collection[id][prop]=value;
} else if (prop === "tracks" && value !== ""){
if (collection[id].hasOwnProperty(prop)){
collection[id][prop].push(value);
} else {
collection[id][prop]=[value];
}
} else {
delete collection[id][prop];
}
return collection;
}
but it is letting pass. I don't understand why. I tested, all the functions are working just as required
it is not letting me pass
@kutsuya1 could be true. I changed it after your advice, to if (Boolean(arr[i])=='false') , and now the 'wrong'messages next to that line dissappeared. But the whole of the code still doesn' t work, unfortunately
@ranranking Code works. Save the code and try refreshing the browser.
@ranranking if(prop==="tracks" && value!==""){
if(collection[id][prop]){
collection[id][prop].push(value);
}
else{
collection[id][prop]=[value];
}
}
else if(value!==""){
collection[id][prop]=[value];
}
else{
delete collection[id][prop];
}
return collection;
}
@1koenvdp why do you need a loop in bouncer? what does arr.filter do?
@1koenvdp Yes, filter will do the looping.
@ranranking sorry there is some error in above code correct one is this function updateRecords(id, prop, value) {
if(prop==="tracks" && value!==""){
if(collection[id][prop]){
collection[id][prop].push(value);
}
else{
collection[id][prop]=[value];
}
}
else if(value!==""){
collection[id][prop]=value;
}
else{
delete collection[id][prop];
}
return collection;
}
// Alter values below to test your code
updateRecords(5439, "artist", "ABBA");
function titleCase(str) {
str=str.toLowerCase();
str.substring(0,1)=str.substring(0,1).toUpperCase();
return str;
}
titleCase("I'm a little tea pot");
why the third line cannot work?
@Masd925 Thank you. I refreshed, but the first requirement still is not met. Is that a bug?
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instead of str.substring(0,1)=str.substring(0,1).toUpperCase();
@Leodhy str=str.substring(0,1).toUpperCase();
@krishnakumar360 Thank you. But I don't see the difference between your code and mine
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@ranranking Try another browser. It passed all tests when I tried.
@ranranking only difference will be how you are passing values
but i don't want to change the string str @dimahali
@krishnakumar360 Proper way to test property existence is .hasOwnProperty().
if(obj[key]) has problems.
@Leodhy then create a new variable var new_str = str.substring(0,1).toUpperCase(); and use new_str ?
i need to print the full sentence at the end
"I'm a little tea pot"
which problem?
Title Case a Sentence
i want to lowercase "I" and then uppercase it
@kutsuya1 @Masd925 thank you. I'm trying to implement the advices now, & I try to get 2 the solution again
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@Masd925 I tried Chrome, Safari, and Firefox, none of them worked. Strange
@ranranking just copy the above code and see it will work
HTML
<div ng-repeat="s in selectedBooks" >
<p class="col-md-6">{{s.author}}</p>
<button class="btn btn-success confirmbtn" ng-model="tagName" ng-click="checkout(s.id); addBookID(s.id); updateDataBookID();">
Confirm
</button>
</div>
JS
$scope.bookid= [];
$scope.addBookID = function(id){
$scope.bookid.push({
name: $scope.id
});
};
console.log($scope.bookid);
$scope.updateDataBookID = function(){
$localStorage.bookTaken = $scope.bookid;
};
$scope.updateDataBookID();
but when in my local storage the value is null? any idea why?
i use tolowercase for the whole string,but i don't know how to uppercase one char in the string
@krishnakumar360 No, your code doesn't work either
@Leodhy Strings are immutable, so create a new titlecased string from the old string.
function titleCase(str) {
str=str.toLowerCase();
str.substring(0,1)=str.substring(0,1).toUpperCase();
for (var i=1;i<=str.length-2;i++){
if (str[i] == " "){
str[i+1]=str[i+1].toUpperCase();
}
}
return str;
}
titleCase("I'm a little tea pot");
now I am sure it is a bug
@ranranking --not possible bro just now i have done the code and got passed
@Leodhy `function capitalize(s)
{
return s[0].toUpperCase() + s.slice(1);
}
function titleCase(str) {
var str_arr = str.split(' ');
for(var ii = 0; ii< str_arr.length; ii++){
var str_lower = str_arr[ii].toLowerCase();
str_arr[ii] = capitalize(str_lower);
console.log(str_arr[ii]);
}
return str_arr.join(' ');
}
titleCase("I'm a little tea pot");`
@ranranking ------- try this again -----function updateRecords(id, prop, value) {
if(prop==="tracks" && value!==""){
if(collection[id][prop]){
collection[id][prop].push(value);
}
else{
collection[id][prop]=[value];
}
}
else if(value!==""){
collection[id][prop]=value;
}
else{
delete collection[id][prop];
}
return collection;
}
// Alter values below to test your code
updateRecords(5439, "artist", "ABBA");
@krishnakumar360 Yes, @Masd925 said he used my code and all passed too. However, none of them worked on my browser.
@ranranking do me a favor, copy and paste the full URL here. im just curious if there is anything strange outside of the function you pasted that could be causing issues
i doubt it, but who knows
@krishnakumar360 @qualitymanifest @Masd925 oh, I reset my challenge and all passed. It seems that it was not the function but I have touched something in the object. Sorry
@1koenvdp after recoding, feel free to show code and ask again.
haha. so it was something outside the function. cool
Thanks for the help
what is this code even trying to do?
Math.floor(Math.random() * (max - min + 1)) + min
Math.floor(Math.random() * (max - min + 1)) + min
I know it rounds up with min and max.... but what's with the max-min+1+ min business
function palindrome(str) {
var re = /[\W_]/g;
var lowRegStr = str.toLowerCase().replace(re,''));
var reverseStr = lowRegStr.split('').reverse('').join('');
return reverseStr === lowRegStr;
}
palindrome("eye");
hi what s wrong with the code ?
@jamesMD it gives a random number between min and max, including both min and max values.
@jamesMD Math.random() is between 0 and 1 (1 excluded). -> Math.random() (max - min + 1) is between 0 and (max - min + 1). -> Math.random() (max - min + 1)) + min is between min and max+1 (max+1 excluded). Flooring that returns an integer between min and max.
Just a way to normalize the number range to what you wan't.
@NixonRichard :smile:
lowRegStr.split('').reverse('').join('');Should be
lowRegStr.split('').reverse().join('');
after convert str into arr we dont need the ' ' ?
@jamesMD you can read about different ways to write random function and how to include the bound integers from this link..
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/random
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/random
still wrong
@NixonRichard : Whats the error?
replace(re,''));
lol
@NixonRichard : There is extra closing bracket
@NixonRichard remove the
) at the end of that line.
omg it worked
thx alot guyz
hmm i understand what it does, but mathatically expanded how does it spit out a random number between the min-max digit
nvm
i just got it
hey james u look like chinese
i pretended math.random() = 0
then I solved for it, makes sense now.. thanks @arunkumrv @Masd925
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@NixonRichard yeah i am chinese American
@jamesMD : Does your last name represent Driving Under Influence? :P
@adityaparab no it just worked out that way, never know why last name is what it is, apparently when my parents came to the US, their relatives last name was Dui, so Dui became the last name of our family
yeh
@jamesMD : Okay. Just prey that Donald Trump doesn't become the president! :D
i love duck
is it prey or pray? hmm!
donald s awesome thug
English is a funny language
Yeah... Election is for the president of United States of America.. Not for the president of thugs
@adityaparab
Just prey that Donald Trump what ;)
@Masd925 : Hehe! English is, indeed, a funny language. As you are! :D
@TylerMoeller Morning, yesterday you gave fixed my wiki search function, but you changed the URL to &callback=? at the end, why was that?
@Redoras : Usually, that is how you use JSONP to make AJAX request across different domains.
JSONP requires a callback which we specify in the url as a parameter.
@adityaparab different domains?
@adityaparab pune here
@Redoras : If you're on your website (say example.com) and you want to get data from different website (Say facebook.com). Since example.com and facebook.com are two different domains, the browsers won't let you send ajax request (unless you disable web security). So to be able to send ajax request from one domain to the other (Technically termed as
cross domain) we use a construct called padded JSON (JSONP).
I assume you were making ajax call from your site (codepen.io) to Wiki (wikipedia.org) so that is cross domain.
@chaitanyaashtekar : Greetings! :) Pune is awesome!
@adityaparab job or studying ?
@chaitanyaashtekar : Job! How about you?
will search for a job
Sweet! There are many many UI devs required throughout the industry
yup
@adityaparab do u work as a web developer ?
@chaitanyaashtekar : No! As a full stack dev
Full Stack Javascript
okay.awesome
Thanks! And all the best! :D
me ful stack Ruby on Rails
ty :+1:
@NixonRichard : You should be the president
again
I wuold love to
@NixonRichard @adityaparab then it would be very bad for india :laughing:
hi can anyone help me with the challenge "make object properties private"?
Still better than Donald Trump :D
yup
help make object properties private
:point_right: challenge make object properties private [wiki]
Challenge Make Object Properties Private
Objects have their own attributes, called properties_, and their own functions, called _methods.
You can use the this keyword to reference public properties and methods of the current objects. However, when You need to create private ones so they are not accessible from the outside of the object you just remove the keyword this from the object property or method declaration and declare it with var so that it is private outside its scope.
var Bike = function() {
var speed = 100; // private
function addUnit(value) { // private
return value + "KM/H";
}
this.getSpeed = function () { // public
return addUnit(speed);
};
};:pencil: read more about challenge make object properties private on the FCC Wiki
var Car = function() {
// this is a private variable
var speed = 10;
// these are public methods
this.accelerate = function(change) {
speed += change;
};
this.decelerate = function() {
speed -= 5;
};
this.getSpeed = function() {
return speed;
};
};
var Bike = function() {
// Only change code below this line.
var gear = 3;
this.getGear = function() {
return gear;
};
this.setGear = function(num) {
num = gear;
};
};
var myCar = new Car();
var myBike = new Bike();
im wondering why when num = gear doesn't work
@shaunleow SetGear should assign to gear.
but gear = num works?
Assignment operator assigns from right to left. It evaluates the value on the right hand side and assigns it to the variable on the left.
@adityaparab you work as a MEAN stack developer ?
@Masd925 does this only apply to assignment operators?
@shaunleow Different operators do different things.
@Masd925 ok thanks for clearing that up.
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i want to generate an array of objects like this so how do i insert values dynamically
var array = [{
user-id : 5;
cars-id : ["2", "4","6"];
},{
user-id : 6;
cars-id : ["2", "4","6"];
}
];
@chaitanyaashtekar : Mostly, yes
But there are way more aspects to being a full stack JS dev than just a MEAN stack
@deepakpatil007 : You need to put
user-id in quotes. because if you don't put user-id quotes, the JS interpreter will consider it as a subtraction.
So you can use something like
var array = [{
'user-id': 5,
'cars-id' : ["2", "4","6"]
}];
var newObj = {
'user-id': 6,
'cars-id' : ["2", "4","6"]
}
array.push(newObj);
Same is the case with
case-id
Additionally, the JS coding standards recommend using
camelCase convention instead of hyphen separated convention.
so you should name your variables/keys as
userId and caseId
@deepakpatil007 yes put them in quotes and seperate different object properties with commas
, not ;.
Yes. properties of object should be separated using
, and not ;
@adityaparab ok
anyone want help?
I'm taking queues while my lol queue is going
@adityaparab @arunkumrv @adityaparab Thanks but i want to add values to array inside an object using js
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@deepakpatil007 You wan't to push into 'cards-id' array?
can someone explain to me why this
console.log([1, [], [3, [[4]]]]);is returning the 4 as an object?
does using double square brackets -> [[ something ]] make something an object?
@CurlyWS It is an array with one element that happens to be an array (an object too).
Hi guys need help, I have this for loop,
for(var i = 0; i < balance.length;i++){
if(change > balance[i]){
coins.push(balance[i]);
change = change - balance[i];
}
}what I want is to reset the loop when the conditions are met
@Masd925 sorry, an array that is an object too??
@rudolfpablico what conditions?
@rudolfpablico can you not just set i to 0
change = change - balance[i]
i = 0;
hi i cant understand https://www.freecodecamp.com/challenges/escape-sequences-in-strings
this challenge
this challenge
@CurlyWS In javascript, arrays are one type of object. Putting some value into an array element makes an array
[value]. Putting that as an element to another array makes an array with an array as an element var arr=[[value]]. You could get that value by arr[0][0].
@Masd925 so,
arr= [[value]]
//is the same as
arr[0][0]
?
arr= [[value]]
//is the same as
arr[0][0]
?
@monala the way you use special character s in single quoted strings
@CurlyWS
var arr=[["catpants"]]; creates an array and assigns it to variable arr. It is an object. You can get the primitive value (string) out by accessing the array var str = arr[0][0];. Variable str then has value "catpants".
i cannot pass the "Slasher Flick" part
the program cannot be tested
you have to escape the string
the screen has shown "testing challenge" for a long time
you probably wrote an infinite loop then
just refresh
@CurlyWS when I set it to zero it just reverted back to its previous value. But what I want is to reset it from the start.
@Masd925 ok this has helped me I think Under the same logic I just don't understand why console.log interprets arr=["cat",["pants"]] as an object also
@mafelix i understand the topic
but i dont know how pass Instructions!
but i dont know how pass Instructions!
@monala if you need to replace "tab", use
"\t". Do that for each part of the sequence, and separate them by spaces (within one string)
@rudolfpablico I have done something a bit different here see if you can understand it
//if you use recursion you can create another loop
var balance = [2,3,4,5];
var change = 3;
coins = [];
cycle(0,10);
function cycle(i, limit){
if(limit===0){return "finished";}
for(i; i < balance.length;i++){
console.log(i);
if(change > balance[i]){
console.log("condition met");
coins.push(balance[i]);
change = change - balance[i];
limit--;
return cycle(0,limit);
}
}
}I don't know if this solution is the best workaround though
actually there must be a better way
tell me if you find a solution
@CurlyWS Is that for an FCC challenge, or something else?
This message was deleted
@BKinahan it was a reply to @rudolfpablico problem
@JPRocks review the syntax of a switch statement.
he wanted to reset a for loop if a condition is met
must be a much simpler way (I have 3 hrs sleep)
function switchOfStuff(val) {
var answer = "";
// Only change code below this line
case 'a';
return 'apple';
break;
case 'b':
return 'bird';
break;
case 'c':
return 'cat';
break;
default:'stuff';
// Only change code above this line
return answer;
}
// Change this value to test
switchOfStuff(2);
Thanks @BKinahan shall do that... Any other pointers welcome. Off to day job now.... Thanks all
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@JPRocks Where is
switch(...) clause?
@JPRocks how did that wrok without
switch() ?
@chaitanyaashtekar it didn't ;)
@BKinahan sorry but I am beginner
this is my string
var myStr = "\this \tis \tJavaScript \rtest \nstring for this challange!"
i didnt work
:(
@monala you don't need to add those extra words, just represent the characters requested in the instructions.
backslash, tab, etc
@BKinahan oh thank you so much :+1:
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why do we need a scripting language? What advantage does a scripting language like JS may have over Compiled languages like Java?
Hi everyone. I need help. Can anyone tell me what's wrong with this code?
var collection = {
2548: {
album: "Slippery When Wet",
artist: "Bon Jovi",
tracks: [
"Let It Rock",
"You Give Love a Bad Name"
]
},
2468: {
album: "1999",
artist: "Prince",
tracks: [
"1999",
"Little Red Corvette"
]
},
1245: {
artist: "Robert Palmer",
tracks: [ ]
},
5439: {
album: "ABBA Gold"
}
};
// Keep a copy of the collection for tests
var collectionCopy = JSON.parse(JSON.stringify(collection));
// Only change code below this line
function updateRecords(id, prop, value) {
if (value ===""){
delete collection[id][prop];
}
else if(prop !=="tracks"){
collection[id][prop]=value;
}
else if(prop ==="tracks") {
collection[id][prop].push(value);
}
return collection;}
// Alter values below to test your code
updateRecords(1245, "album", "Robert Palmer");
@Mats05 use backticks to format your code
@Mats05 As I said in the main chat, you don't handle the case where "tracks" is needed but not present :P
@BKinahan I'm not completely sure I understand you. I'm an amateur coder and still learning
hey huys
guys*
i have a problem w/ record collection
did someone solve this one?
@Mats05 See the album with id 5439. If you attempt
collection[id][prop].push(value);, it won't work, because it has no "tracks" property defined. So you need to create it. read about .hasOwnProperty() if you are not familiar with that :)
@IonatanMocan that message may help you, too ^
thank you bro
can you give me an example?
you said if there is no "tracks" property defined
with .hasOwnProperty, then i should create it
right?
@Mats05 ?
Hello guys,
I've a little problem with this code
function largestOfFour(arr) {
// You can do this!
var x = 0;
var tmp = [];
for (var i = 0; i < arr.length; i++){
for (var j = 0; j < arr[i].length; j++){
if (arr[i][j] > arr[i][j+1]) {
tmp[x] = arr[i][j];
x++;
}
}
console.log(arr[i]);
}
return tmp;
}
largestOfFour([[4, 5, 1, 3], [13, 27, 18, 26], [32, 35, 37, 39], [1000, 1001, 857, 1]]);
@IonatanMocan Some records in collection don't have tracks property. It prop is tracks, make a check with .hasOwnProperty() and if it returns false, assign
[value] to tracks property. If true, just push the value to tracks array.
This return me [5, 27, 1001, 857]... Do you know why ?
var myStr = "I am a \"double quoted\" string inside \"double quotes\" "; is ot working what to do now ?
not*
if I want to print an empty array, how to print "[]" to replace "[null]"?
@TMORGANT You have to have some variable that holds the largest number found for each subarray. Also
x is not needed. Only obscures the logic. Something like this would work:
function largestOfFour(arr) {
// You can do this!
var tmp = [];
for (var i = 0; i < arr.length; i++){
tmp[i]=-Infinity;
for (var j = 0; j < arr[i].length; j++){
if (arr[i][j] > tmp[i]) {
tmp[i] = arr[i][j];
}
}
}
return tmp;
}
@hitikrajpalhr Haven't you forget a "." ?
I'm doing the Quote Generator challenge. How do I make it tweet the actual quote and not the codepen? http://codepen.io/kingdezz/pen/mEJPLN
@Leodhy What challenge are you doing? Falsy bouncer perhaps.
yep
@Leodhy I would quess that the value in the array is NaN. It shows as null in FCC console.
I can't figure this simiple function out. what SHOULD go between the comments??
@Leodhy NaN needs special attention there because NaN===NaN is false. NaN is not equal to any value.
function convertToF(celsius) {
var fahrenheit;
// Only change code below this line
fahrenhett="celsius"*9/5+32;
// Only change code above this line
return fahrenheit;
}
// Change the inputs below to test your code
convertToF(30);
Hello
@garriottteresa You have to use
celsius in the equation without quotes. It is a parameter that holds the passed number (30 in the test case below the code).
Hi @Masd925
@Spyreo Hi.
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++){
console.log(multiplyAll[i]);
}
}
// Only change code above this line
return product;
}
// Modify values below to test your code
multiplyAll([[1,2],[3,4],[5,6,7]]);
Can you tell me what i am doing wrong here sir
@Spyreo Try multiplying product instead of logging. Also you need to access arr, not the function name.
@Masd925 i still cannot avoid null in my output
@Masd925 It works, but can you help me figure out except for the "i" var, what are the big difference between your code and mine ? :/
@Leodhy Post the code.