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.
Can anyone help me shorten this code, or point me in the right direction. The answer was easy to get but it feels a little hacky the way I did it.
```
function findLongestWord(str) {
var words = str.split(" ");
var longestWord = 0;
for (var i=0; i<words.length; i++){
if (words[i].length > longestWord){
longestWord = words[i].length;
}
}
return longestWord;
}
findLongestWord("The quick brown fox jumped over the lazy dog");
@willcoxDev You could do it with
reduce
hmm
oh wow just looking online and someone put an answer up
and used the exact same variable
as me
looks dodgy rofl
after having a look at the reduce way and the sort way, mine actually seems fine. Neither of them really reduce the code, thanks for the help
@eyesore- thanks
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Can any one help me with my code, i'm doing a factorisation chanlege and normaly my code should work but i don't know why that doesn't work in free code camp console.
@willcoxDev
No problem.
No problem.
function findLongestWord(str) {
return str
.split(' ')
.reduce( (result, word) => {
if(word.length > result.length) result = word
return result
})
}:bulb: to format code use backticks! ``` more info
here are my code:
function factorialize(num) {
let solde = 1;
while(num > 1){
solde = solde * num;
num = num - 1;
}
return solde;
}
@dbib What error is it giving you?
@dbib that should work
here is error:
loopProtect is not defined
feedback please!
i'have try to use for loop but that give me the same error
Hello.
Goodbye.
@dbib if you can calculate how many times a loop will run beforw you run it... you should use a for loop.
It is always better to count your loop upward if possible.
@revisualize
i'have try that doesn't work i'have try it in my computer terminal and that work greatly but in free code camp console that give me always the error even with while or for loop
i'have try that doesn't work i'have try it in my computer terminal and that work greatly but in free code camp console that give me always the error even with while or for loop
I want to see the for code.
hey i dont understand what im doing wrong with this challenge
<body>
<script>
const dataset = [
[ 34, 78 ],
[ 109, 280 ],
[ 310, 120 ],
[ 79, 411 ],
[ 420, 220 ],
[ 233, 145 ],
[ 333, 96 ],
[ 222, 333 ],
[ 78, 320 ],
[ 21, 123 ]
];
const w = 500;
const h = 500;
const svg = d3.select("body")
.append("svg")
.attr("width", w)
.attr("height", h);
svg.selectAll("circle")
.data(dataset)
.enter()
.append("circle")
.attr("cx", (d, i) => d[0])
.attr("cy", (d, i) => h - d[1])
.attr("r", 5);
svg.selectAll("text")
.data(dataset)
.enter()
.append("text")
// Add your code below this line
.text((d) => d)
.attr("x",(d,i)=> d[0]+5)
.attr("y", (d,i)=> h-d[1]);
// Add your code above this line
</script>
</body>
please help
@revisualize my for loop code
function factorialize(num) {
let solde = 1;
let vaa = num;
for (let i = 0; i < vaa.length; i++){
solde *= vaa;
vaa -= 1;
}
return solde;
}
also that challege is for D3
@dbib a number doesnt have a .length
@dbib replace vaa.length with num
@revisualize that also not work
function factorialize(num) { let solde = 1; for (let i = 1; i < num; i++){ solde *= i; } return solde; }
<=
Instead of <
Im on my phone so, i cant run that.
Does that work?
@revisualize not that not work
they give me the same error:
"loopProtect is not defined"
they give me the same error:
"loopProtect is not defined"
Hey guys, I am having trouble with js .sort function
it is working fine with every toher array
except for one that looks like [1000, 1001, 857, 1]
its sorts it to 1 1000 1001 857
@willcoxDev Yeah, it sorts to unicode
@willcoxDev check this out https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort?v=control
Just watched a tutorial on youtube regarding Seek and Destroy. There’s zero percent chance I would have ever figured that out. I still don’t fully understand exactly what’s taking place with the loop inside the other loop for example
Starting to worry I simply may not be cut out for this. Any suggestions guys?
@DavidMillerFL do you understand all the challenges before that?
@eyesore- Ok i got the answer now but that is weird so sort just adds up the total of each unicode number ?
and 857 unicode is bigger than 1001?
@willcoxDev It will sort by it's unicode value. Which is by character. That is why it works for text. In numbers you start to get 1, 10, 11, 2, 3, 4 ...
@willcoxDev
except for one that looks like [1000, 1001, 857, 1]
its sorts it to 1 1000 1001 857
you need a function
Yes. I understood mostly all the challenges prior to this.
Sometimes I needed a hint or help from the people here.
Sometimes I’d struggle, but eventually get it after asking or reading or watch.
But there were also some where my brain would just go blank @longnt80
@dbib Okay, I'm home.
@DavidMillerFL Don't beat yourself up too much man. It can be difficult. Just take the challenge and function one step at a time. It can also help to diagram what is going on.
@revisualize great try it too to see if that will work for you
I think the reason this one was so difficult is because it introduced .filter and something called argument objects and never really touched on those concepts before @longnt80
@DavidMillerFL oh yeah, you need to read those concept slowly
@dbib It works.
from different sources
@eyesore- I appreciate that. And yes diagrams help. Good point!
@dbib Here:
hello
@DavidMillerFL usually, I have to read at least 2 sources for each concept FCC introduces
I'm having some trouble on understand the Truncate a string challenge
@dbib Your original answer works. It looks like the challenge is looking for a variable that is not present. Have you tried refreshing your browser?
@longnt80 That’s a good strategy, I’ll try that from now on. :) Thanks dude.
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@DavidMillerFL once I understand how to use the method, I can figure out the challenge
Where do you read about these things?
@DavidMillerFL start with MDN and w3school
@eyesore- no let me try
`function truncateString(str, num) {
if (str.length > num) {
return str.slice(0, num);
}
}
truncateString("A", 1);`
MDN, while very thorough isn’t too… layman-ish
@DavidMillerFL
yeah, that's why you need w3school
yeah, that's why you need w3school
@dbib This code:
function factorialize(num) {
let solde = 1;
while(num > 1){
solde = solde * num;
num = num - 1;
}
return solde;
}Works for me as well.
@DavidMillerFL If you get super stuck on something shoot me a message and I can walk you through it.
@eyesore- Thanks so much that means a lot. I appreciate it.
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@dbib Here --^
@DavidMillerFL No problem.
@dbib So.... Yeah.. I don't know what your problem is.
I’m gonna take a break. Halo Top ice cream might make me a better programmer, so I can’t take the risk and not eat it
@DavidMillerFL but don't ask too soon, just read the materials first. Most of these basic challenge is not that complicated, you just need to understand the basic. Sometimes, in MDN they already have an example that can solve the challenge. You just have to read it from top to bottom though, that's the hard part.
@revisualize , @eyesore- that doesn't work let me try to change the browser
@revisualize ,@eyesore i change the browser and that work very well
thank you
thank you
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I'm baffled
nothing makes sense anymore
in Iterate Through an Array with a For Loop iam using this code should equal 20 but outputs 5
// Setup
var myArr = [ 2, 3, 4, 5, 6];
// Only change code below this line
for (var i = 0; i < myArr.length; i++) {
total += myArr[i];
}
var total = [i];
i guys i have each checkbox in my table i just want to hide the checkbox and appear when hovering the row is there anyone have a guide to do that???
@billjen23
var total = [i];
why are you doing this?
that is where i outputs to
what?
how is everyone doing?
does anyone know why index of is -1? when it shouldn't be?
Why are you passing a boolean to
indexOf?
if that letter already exists it will not write it again
index of -1 means that value was not found
therefore if -1 it will execute the code
Look at what you are doing though.
@eyesore- what am I doing?
takenGrid.indexOf(pos === -1)
oh....
pos === -1 is going to be a boolean
I'm guessing you want that outside haha
@eyesore- tnx
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No problem!
@eyesore- went in to full tunnel visions
:D
It's cool. Completely has happened to me.
I cant seem to find the syntax for pushing to a multi dimensinoal array
I am trying
multiArray[i].push(arr[j]);
@willcoxDev Javascript doesn't actually have multidimensional arrays, just nested arrays
hmm
@cmccormack hey dude!
@willcoxDev that syntax could be fine but no context to tell
@Giveback007 heya
is there a tutorial that goes deeper into this lesson my code is not working im totaly lost
function chunkArrayInGroups(arr, size) {
var multiArray = [];
for(var i=0;i<size;i++){
multiArray.push(i);
for(var j=0;j<arr.length;j++){
multiArray[i].push(arr[j]);
}
}
return arr;
}
chunkArrayInGroups(["a", "b", "c", "d"], 2);
type error multiarray[i].push is not a function
Can anyone explain this challenge to me?
You'ins I'm having some difficulty on Seek and Destroy. I've figured out how to swap the argument into an array, but I can't make heads or tails of the
Array.filter(). I'm fairly certain that I need to filter the array according to search criteria but the MDN is confusing.
@willcoxDev why are you storing an integer in the first for loop? Numbers don't have
push methods
One punch man, where are you stuck?
@willcoxDev
multiarray[i] is not an array
Oh my bad, link was super long! Anyway, can anyone explain why removing the last console.log() line makes the function run?
I'm not stuck I just don't understand this^^
Bart
Haha I forgot I had that.
ONE PUNCH!!!!
oh i think i see what you mean
ill go give it anothe crack
@tmag298 the idea is to show you what the value is, if you passed the test you might not see the value. Removing it prevents viewing the value but allows the tests to complete. At least I think... :)
The reason it fails is because that variable is defined within a function so console.log does not have access to it.
But within the function if you write console.log() it does?
Yup!
Word, that's all.
Thankyou @eyesore-
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No problem! Anytime.
@eyesore- got another question
Sup
https://tinyurl.com/lu699rp
In this challenge, we invoke a local variable outside of a function. So local variables can be invoked, but not processed outside of its function? Is this the case?
In this challenge, we invoke a local variable outside of a function. So local variables can be invoked, but not processed outside of its function? Is this the case?
good nigh everyone
@tmag298
// someVar equals 'Hat' in the global scope
var someVar = "Hat";
function myFun() {
// someVar equals 'Head' inside this function
var someVar = "Head";
return someVar;
}
Good night
So if you were to run
console.log(myFun()) // = 'Head'
console.log(someVar) // = 'Hat'
Does that make sense?
Invoking is when you invoke a function. Running
myFun() that is invoking. Creating a variable is declaring. I'm not trying to be a grammar cop here, but just for future reference.
Good Evening Campers,
i am a new javascript learner
i did not get the first one?
Any thoughts?
Refresh your browser. You should be good.
no idea
it does not function
What is the name of the lesson?
javascript
Storing Values with the Assignment Operator
@aj141 I think you have to write
var b = a; under the last comment:
You need to reset your code and only make changes under the comment.
@longnt80 not functioning
Reset your code and only make changes under the comment.
@aj141 yeah you should do what @eyesore- said
correct
thank you all
@aj141 No proble.
Exercise Repeat a string repeat a string. I'v laid down this code which works in my editor, won't let me pass the exercise by no means even if the result output is correct... anyone?
function repeatStringNumTimes(str, num) {
var holder = [];
var re = /\b/g;
if (num < 0) {
return holder.toString();
}
for (var i = 0; i < num; i++) {
holder.push(str);
}
var a = holder.join("");
var b = a.replace(re, '"');
return b;
}
repeatStringNumTimes("abc", 4);
@fatmike-slo Why are you using regex?
to add the brackets at the start and end of the output as requested
@fatmike-slo It doesn't ask you for brackets though. You just have to return
'abcabcabcabc'
ahem ... there was no need for added brackets ... lol it works if i ouput var a
it's getting late, have to sleep :D thnx !!
Yeah, you dont need to do regex haha. No problem!
Oh, also I would suggest to get in the habit of making descriptive variable names especially if you are planning on working as a developer.
this was just a paste from my editor where i write sloppy to save time, but u'r right, will try to be more descriptive :)
Oh, no worries! Just a suggestion. haha
I'm back! Very simple question
Function to add an element from function parameter into a Linked List
this.add = function(element){
// Only change code below this line
var node = new Node(element);
if(this.size() === 0) {
this.element=element;
head = element;
}
else {
var dummyNode=0;
while(this.next!==null) {
dummyNode = this.element;
}
dummyNode.next = element;
}
length++;
// Only change code above this line
};Any help on where am I going wrong?
how do I even create a queue for this challenge? https://tinyurl.com/lxbwk38
I am too bad at this! and it's confusing me . :/
@tmag298 Do you have anything written yet?
I don't even know where to start lol
Like do I just edit the return statement?
good evening world pls i need your help on this
@sinharaksh1t don't say that!
function abTest(a, b) {
// Only change code below this line
if (a || b < 0) {
return undefined;
}
// 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);
@tmag298 well if you are building a queue a good way to do it is with an
array since you've got methods like push pop shift etc...
@sinharaksh1t Is that for a lesson? Could you send me the name?
@blackcytographer ur code saying...
if a have a truthy value OR b is < 0
if a have a truthy value OR b is < 0
@tmag298 ah lol.. I was talking about the question which I posted above... and yes that's from beta.freecodecamp.com
also, about your question, where are you getting stuck at ?
also, about your question, where are you getting stuck at ?
@revisualize you still around?
@Lumexralph I've applied what i thought were the correct loops but they didn't work. How do i know when to apply the proper loop?
Are you still available?
Can anyone help with the following question?
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.
You will need to use string operators to build a new string, result, using the provided variables: myNoun, myAdjective, myVerb, and myAdverb.
You will also need to use additional strings, which will not change, and must be in between all of the provided words. The output should be a complete sentence.
We have provided a framework for testing your results with different words. The tests will run your function with several different inputs to make sure all of the provided words appear in the output, as well as your extra strings.
@karthiksagr When you put things inside quotes then they are strings.
@karthiksagr So if you call
'myNoun' it will output 'myNoun' and not 'dog'
@karthiksagr when this line runs:
it will call the function:
and
you have to create a sentence made up of those words and assign to
wordBlanks("dog", "big", "ran", "quickly");it will call the function:
function wordBlanks(myNoun, myAdjective, myVerb, myAdverb)and
"dog", "big", "ran", "quickly" will be values for the parameters (myNoun, myAdjective, myVerb, myAdverb) in the functionyou have to create a sentence made up of those words and assign to
result
@karthiksagr you got the right idea, but the syntax is wrong. Parameter should not be in quotation marks
You want to make it dynamic and use the variables.
@karthiksagr no, use the parameters like the first one you showed us
@karthiksagr also, remember to add spaces between each word
I'll give you a hint with a short version @karthiksagr
result = "The " + myAdjective + " " + myNoun;this would be something like "The little cat"
but you need to come up with one on your own
@sinharaksh1t I don't even really know where to start. Like is a queue just created like we create functions with something like function myFunction()?
Can someone point me in the right direction for whre I am going wrong with this questions
@tmag298 A is FIFO data structure. So it's first in first out. In JS you could see an Array as a queue.
function mutation(arr) {
if (arr[0].toLowerCase().indexOf(arr[1].toLowerCase())){
return true;
}
return false;
}
mutation(["hello", "Hello"]);
@willcoxDev What is it supposed to do?
return true if all the charcters at index 1 are in index 0
false otherwise
Cool, so right now you are just checking the first letter. What if I had
mutation(['hello', 'hEllo'])?
Hello.
@eyesore- is the arr[0] not "hello"
function mutation(arr) {
var m=arr[0].toLowerCase();
var n=arr[1].toLowerCase();
for(var i=0;i<n.length;i++)
{
if(m.indexOf(n[i])!==-1 )
{
return true;
}
return false;
}
}
what is wrong with my code
Yeah, sorry. I misread what you had.
@willcoxDev If you are going to lowerCase both. Why not just compare them with ===?
Hello, can i get some help
I thought === was strict
@fillopfy I just solved that yesterday, so hard.
the question says to try using indexOf()
@willcoxDev If they are strings it's cool.
function rot13(str) { // LBH QVQ VG!
var strArr = [];
for (var i = 0; i < str.length;i++) {
var char = str.charCodeAt(i) - 13;
strArr.push(String.fromCharCode(char));
}
return strArr;
}
// Change the inputs below to test
rot13("SERR PBQR PNZC");
yeh its alwasy strings
@punyparker it is passing all the test except the first one
in the example
@punyparker please don't give your solution
Can someone help me with the above.
im working through it now
and want to get it
@longnt80 can you see my code and what is wrong in it
@punyparker sorry, I thought you gave the solution to @fillopfy
yeh same hhaa
@longnt80 different one xD
I keep getting the wrong answer
@longnt80 can you help?
Run the code and you will see
@willcoxDev The reason why it does not work is because it is the same word. So it begins at 0. With type coercion 0 turns into
false
@punyparker let me check
@eyesore- and this one:
function mutation(arr) {
var m=arr[0].toLowerCase();
var n=arr[1].toLowerCase();
for(var i=0;i<n.length;i++)
{
if(m.indexOf(n[i])!==-1 )
{
return true;
}
return false;
}
}
It's supposed to return Free code camp
// Setup
var myObj = {
gift: "pony",
pet: "kitten",
bed: "sleigh"
};
function checkObj(checkProp) {
// Your Code Here
var go;
if( myObj.hasOwnProperty(checkProp) == true){
go = myObj.checkProp;
}else{
return "Not Found";
}
return go;
}
// Test your code by modifying these values
checkObj("gift");
Could anyone help me
i dont know why my cide is not working
@fillopfy You want to switch your conditional. You want to be checking if it does not exist in the other string and if it doesn't then return false.
@fillopfy that way you are terminating right when you have the answer.
I have to return the value if it axists in the object otherwise not found
@eyesore- but it is passing all the test except {hello,hye}
@fillopfy Yeah, your code is only checking the first letter is that is the case. So when it hits 'h' it does not equal -1 which then returns true.
@fillopfy You dont want to do that.
@sanu921 Check out the different between dot notation and bracket notation
@eyesore- i am not understanding
@fillopfy post your code again
function mutation(arr) {
var m=arr[0].toLowerCase();
var n=arr[1].toLowerCase();
for(var i=0;i<n.length;i++)
{
if(m.indexOf(n[i])!==-1 )
{
return true;
}
return false;
}
}
@punyparker you need half of the letters in alphabet to
+ 13 in charcode
@longnt80 what do you mean
a is 65
@fillopfy
for(var i=0;i<n.length;i++)
{
// n[i] = 'h'
// if indexOf 'h' does not equal -1
// 'h' is in m so it does not equal -1
if(m.indexOf(n[i])!==-1 )
{
// since 'h' is in m
// function returns true and it does not check anything else
return true;
}
return false;
}
}
mutation(['hello', 'hye'])
@fillopfy in your code, if the first letter is contained, it will quit the loop and not check for the next letter
65-13 isnt a letter
@fillopfy You want to be checking if
n[i] is not in m then return false. If the loop is not and it never returned then you should return true
Hi guys, can anybody tell me what 'Everything Be True' challenge's problem means? "Check if the predicate (second argument) is truthy on all elements of a collection (first argument).
Remember, you can access object properties through either dot notation or [] notation."
@eyesore- @longnt80 hmm, i got it . It return the value after checking only the initial value
@fillopfy yeah you need to move your
return true outside of the loop so it can goes through all the letters
check if its truthy means second arg is in each object in first arg, right?
@punyparker in ceasar cipher,
A will be N right? So when you input A it will translate to N by adding 13 in charCode. But in the opposite, if you input N, it will translate to A by subtract 13 in charCode.
@longnt80 when i did that, all the test failed and the first test passed
@fillopfy please post your code again
@longnt80 but suppose you input
A, and thats 65. 65 -13 isn't a letter.
function mutation(arr) {
var m=arr[0].toLowerCase();
var n=arr[1].toLowerCase();
for(var i=0;i<n.length;i++)
{
if(m.indexOf(n[i])!==-1 )
{
return true;
}
return false;
}
}
@longnt80 this is passing all test except the first one
@punyparker yeah, it's not a letter, you have to convert it to letter again
@longnt80 but when I interchanged the statments, first condition passed and all failed
try ```
@longnt80 How would I do that, that's my problem.
Yes, I've used that
if(m.indexOf(n[i]) < 0){
return false;
}
return true;@fillopfy
if(m.indexOf(n[i])!==-1 )
{
return true;this will stop the loop if the first letter is matched
its bascailly saying if the first letter in the same as the other first letter return true
so ["he", "hr"] returns true
@fillopfy you need to do the opposite: stop the loop if the letter is not matched
as both first letters are H
@willcoxDev same result
@fillopfy here's the opposite:
if(m.indexOf(n[i]) === -1 )
{
return false;
have u swapped your false and true?
Are you dropping the return true outside the loop?
That is pretty essential in it.
function mutation(arr) {
var m=arr[0].toLowerCase();
var n=arr[1].toLowerCase();
for(var i=0;i<n.length;i++)
{
if(m.indexOf(n[i])<0 )
{
return false;
}
return true;
}
}
You dont want to return true until the end of the loop and it has checked everything
this also pass all except first
your return true is insdie ur for loop
move it outside
Yeah, you are returning true in your loop so you are still having the same issue.
@punyparker ok let's break it down. What's the charcode of A?
for (var i=0; i<n.length; i++){
if (m.indexOf(n[i]) < 0){
return false;
}
}
return true;
}
@eyesore- aha...finally worked
@longnt80 @willcoxDev @eyesore- thanks everyne
fillopfy sends brownie points to @longnt80 and @willcoxdev and @eyesore- :sparkles: :thumbsup: :sparkles:
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No problem.
should I be using sass in codepen or is it just something else to learn?
@longnt80 65
@whackdev If you want to do front end then you should definitely learn some kind of precompiler like SASS or LESS
@eyesore- do you just chill in this chat to help people
@fillopfy you should tinker with that
i noticed your score is low meaning you havent done much of the camp correct?
but you clearly know whats going on
@punyparker what's the charcode of N?
@willcoxDev I've done very little. Yeah, I come on from time to time to help out.
@willcoxDev the scores only go up when someone sends brownie points
weird my cookie score is 250 whichs is the same as my score of how many parts I ahve done
@whackdev no, you also ad points when complete challenges
@longnt80 tinker?
@willcoxDev I definitely believe that teaching is the best way to solidify your knowledge. Most devs write blog posts, but I really don't like writing.
@fillopfy meaning play around with it to understand how
return works
is what I was refering 2
I think I've done like 5 lessons at most.
@eyesore- ah true
@longnt80 yeah, I was using the wrong comparison and then returning true within the loop
@willcoxDev I think you get points for both because mine is 277 and I haven't completed that many challenges I'm only on intermediate
Yeah, so instead of blogging I just come on here or I will write tests to implement methods from scratch like
reduce in case anyone wants to get real deep with JS
@eyesore- you said, teaching is the best way to learn
does anyone teach code like freecodecamp does
Like person or another site?
But yeah teaching someone else really shows if you understand the concept to begin with.
@fillopfy interactivepython.org has some great python modules, that's where I started
@punyparker
translating: A to N:
translating N to A:
translating: A to N:
A -> 65 -> 65+13 -> 78 -> Ntranslating N to A:
N -> 78 -> 78 -13 -> 65 -> A
@punyparker so the first half of the letters from A-Z with need to +13 in their charcode, and the last half of the letters from A-Z with need to -13 in their charcode.
//Setup
var contacts = [
{
"firstName": "Akira",
"lastName": "Laine",
"number": "0543236543",
"likes": ["Pizza", "Coding", "Brownie Points"]
},
{
"firstName": "Harry",
"lastName": "Potter",
"number": "0994372684",
"likes": ["Hogwarts", "Magic", "Hagrid"]
},
{
"firstName": "Sherlock",
"lastName": "Holmes",
"number": "0487345643",
"likes": ["Intriguing Cases", "Violin"]
},
{
"firstName": "Kristian",
"lastName": "Vos",
"number": "unknown",
"likes": ["Javascript", "Gaming", "Foxes"]
}
];
function lookUpProfile(firstName, prop){
// Only change code below this line
for (var i = 0; i < contacts.length; i++) {
if(contacts[i].firstName === firstName) {
if(contacts[i].prop === prop) {
return contacts[i].prop;
} else return "No such property";
} else return "No such contact";
}
// Only change code above this line
}
// Change these values to test your function
lookUpProfile("Akira", "lastName");
Any ideas how to help me on this one?
@ankerpeet First ask what prop is referring to.
@ankerpeet
contacts[i].prop
@longnt80 THANKS SO MUCH
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prop isn't really a direct property on the object
@ankerpeet also,
else return "No such contact";- does this make sense in the for loop?
@Manish-Giri Its only a paramter for the lookUpProfile function?
anyone know how to turn off all notifications from this chat
@ankerpeet yes
so using dot notation won't work
I set it to only show when I am mentioned by name
bracket notation then?
@Manish-Giri
@Manish-Giri
@ankerpeet yup
addTogether(2)(3) if the call is this, how can I access to the second closure? arguments[1]would not access to (3)
@ankerpeet
if(contacts[i].prop === prop)ask if this should be:
if(contacts[prop] === prop)if it should why or why not?
what about:
if(contacts[prop] == prop)
@wikiwiggs Let me adjust my code a bit and i'll be back. thank you
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function diffArray(arr1, arr2) {
var newArr = [];
// Same, same; but different.
var ne =arr1.concat(arr2);
for(var i = 0; i < arr1.length;i++){
if(arr1.indexOf(ne[i]) >=0 && arr2.indexOf(ne[i]) ==-1)
newArr.push(ne[i]);
if(arr1.indexOf(ne[i]) ==-1 && arr2.indexOf(ne[i]) >=0)
newArr.push(ne[i]);
}
return newArr;
}
diffArray(["andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]);
@masaki1223 you need to read the link they give you in the challenge
$(document).ready(function() {
$.ajax({
type: 'GET',
url: 'https://wind-bow.glitch.me/twitch-ap/streams/freecodecamp?callback=?',
header: {'Client-ID': 'hs5elqgum44iq9qdg3a1a3ydpyp00b'},
success: function(data) {
console.log(data);
},
error: function(err) {
console.log("error");
}
});
});
Hi, I'm trying to beat the challenge Intermediate Algorithm Scripting: Diff Two Arrays
and not getting the correct result even though I think I should be getting a new Array with different values from each array like the challenge specifies
I'm only passing 5 test though
@longnt80 What he is talking about is more currying than closure.
function diffArray(arr1, arr2) {
var newArr = [];
// Same, same; but different.
var ne =arr1.concat(arr2);
for(var i = 0; i < arr1.length;i++){
if(arr1.indexOf(ne[i]) >=0 && arr2.indexOf(ne[i]) ==-1)
newArr.push(ne[i]);
if(arr1.indexOf(ne[i]) ==-1 && arr2.indexOf(ne[i]) >=0)
newArr.push(ne[i]);
}
return newArr;
}
diffArray(["andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]);
Here is my code, I'm not sure how to format it how it looks in the browser
@eyesore- but there's an example in that link which explain that case
@deuscode try this:
$(document).ready(function() {
$.ajax({
type: 'GET',
url: 'https://crossorigin.me/https://wind-bow.glitch.me/twitch-ap/streams/freecodecamp?callback=?',
header: {'Client-ID': 'hs5elqgum44iq9qdg3a1a3ydpyp00b'},
success: function(data) {
console.log(data);
},
error: function(err) {
console.log("error");
}
});
});Read more:
https://crossorigin.me/
@CodeAstor put your code in backticks ```
function diffArray(arr1, arr2) {
var newArr = [];
// Same, same; but different.
var ne =arr1.concat(arr2);
for(var i = 0; i < arr1.length;i++){
if(arr1.indexOf(ne[i]) >=0 && arr2.indexOf(ne[i]) ==-1)
newArr.push(ne[i]);
if(arr1.indexOf(ne[i]) ==-1 && arr2.indexOf(ne[i]) >=0)
newArr.push(ne[i]);
}
return newArr;
}
diffArray(["andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]);
Thanks
@masaki1223
here's the exmaple:
function makeAdder(x) {
return function(y) {
return x + y;
};
}
var add5 = makeAdder(5);
var add10 = makeAdder(10);
console.log(add5(2)); // 7
console.log(add10(2)); // 12you can see add5(2) is exactly makeAdder(5)(2)
@wikiwiggs is that a proxy?
@wikiwiggs I'm unsure if it can pass the headers to the call... getting a "header is required"
Yeah, if you were running (serving up these API calls) it would server side like on a Node or PHP backend, but because you are on the client side for these code pen exercises you will have this issue.
@deuscode Give me a second, lets see if we can try something else.
@Manish-Giri so would I have to use the .hasOwnProperty function?
@CodeAstor what are you trying to do? it looks like the code is pushing
ne[i] no matter what
@wikiwiggs I'm actually running locally, going to upload this to my webhost after I'm done with the project
@whackdev Compare two arrays and return a new array with any items only found in one of the two given arrays, but not both. In other words, return the symmetric difference of the two arrays.
@wikiwiggs I used the http://localhost for my twitch client_id redirect
@deuscode You want to read about CORS. That will help you out.
So I start out by combining two arrays
@wikiwiggs yep, I am using a jsonp callback parameter to get around the CORS
and then I check if the value on ne[i] is in one of the originals but not in the others
Then add them in
@eyesore- yep, I am using a jsonp callback parameter to get around the CORS
@deuscode
$(document).ready(function() {
$.ajax({
type: 'GET',
url: 'https://crossorigin.me/https://wind-bow.glitch.me/twitch-ap/streams/freecodecamp?client_id=hs5elqgum44iq9qdg3a1a3ydpyp00b?callback=?',
success: function(data) {
console.log(data);
},
error: function(err) {
console.log("error");
}
});
});```function diffArray(arr1, arr2) {
var newArr = [];
// Same, same; but different.
var ne =arr1.concat(arr2);
for(var i = 0; i < arr1.length;i++){
if(arr1.indexOf(ne[i]) != -1&& arr2.indexOf(ne[i]) ==-1)
newArr.push(ne[i]);
if(arr1.indexOf(ne[i]) ==-1 && arr2.indexOf(ne[i]) != -1)
newArr.push(ne[i]);
}
return newArr;
}
```
lol
even hard coding the client_id I get a Header is required @wikiwiggs
```function diffArray(arr1, arr2) {
var newArr = [];
// Same, same; but different.
var ne =arr1.concat(arr2);
for(var i = 0; i < arr1.length;i++){
if(arr1.indexOf(ne[i]) != -1&& arr2.indexOf(ne[i]) ==-1)
newArr.push(ne[i]);
if(arr1.indexOf(ne[i]) ==-1 && arr2.indexOf(ne[i]) != -1)
newArr.push(ne[i]);
}
return newArr;
}```
@CodeAstor ok I see it now, I did that one differently
@Manish-Giri I figured it out. Thank you!
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function addTogether(x) {
return function(y){
return x+y;
};
var newArr=[].slice.apply(arguments);
var result=newArr[0]+newArr[1];
for(var i=0; i<newArr.length; i++){
if(typeof newArr[i]!=='number'){
result=undefined;
break;
}
}
return result;
}
var sumTwoAnd = addTogether(2);
sumTwoAnd(3);
addTogether(2,3);
Not sure why the back ticks aren't working for me anymore
This is the last challenge in intemidiate challenge
@wikiwiggs I might end up just biting the bullet and creating a dotenv backend to store API keys and call it via ajax.... argh lol
Yeah, I'm probably not doing it the best way @whackdev
@deuscode
I think that's gonna be the best bet.
I think that's gonna be the best bet.
man the .filter() function is really throwing me through a loop
confusing the heck outa me
@CodeAstor I don't think so I like the idea I just didn't think of it that way. What does your output look like? are you just getting the value of
ne?
@deuscode That's the project I'm currently procrastinating on, this very project. It's more fitting for a different cert in the code school. It has way more to do with backend nuances.
@willcoxDev hated that one
@wikiwiggs yeah... I've procrastinated this a whole bunch... I even have to take down my wiki pedia viewer because i forgot I stored the API client side... :\
Well I'm passing about 5 test so it's working on some of them
You guys want to implement
filter from scratch so you know it inside and out?
@wikiwiggs looks like they should put in the ciriculuum on how to create a backend with dotenv lol...
@whackdev The .filter() page shows an example almsot exactly the same as what you hvae to do for ther answer but even stepping through the code on pythontutor.com its confusing as fk
@wikiwiggs thanks for the effort tho!
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@deuscode I have a backend sort of setup for this if you would like to use it.
@wikiwiggs I would like to see how you created it and/or articles you used to go through it. I'm still new to backend work
@eyesore- you going to hijack the prototype of the array?
@CodeAstor try looking at what's failing you should be able to figure out why you are getting what you are against the expected results
Nah, I was just going to write some tests on a jsbin to implement the function.
@deuscode No articles really, just Twitch's API, and my long history with PHP.
@CodeAstor whats the name of that challenge?
@whackdev Intermediate Algorithm Scripting: Diff Two Arrays
@willcoxDev I know I tried folowing it exactly and it wsa still hard
@wikiwiggs ahhh, that must help a lot. I host on webfaction, so I'll look into how to integrate a backend service with their documentation
@CodeAstor ok I thought it was a different one let me take a look at it
@eyesore- I'm gonna help Peter Kay for a bit, but I'm curious to see you take on this.
I can do reduce first because I have that one set up already haha
@deuscode Let's go into Private chat.
@wikiwiggs sure thing
@masaki1223 there are 2 cases:
addTogether(2, 3): this casearguments.lengthis more than 1addTogether(2)(3): this casearguments.lengthis 1
you need to useifto check
If I have this line
destroyer([1, 2, 3, 1, 2, 3], 2, 3); How do I reference the 2 and the 3 at the end in a function since it not in the array
@willcoxDev use the keyword
arguments
ok thanks
@whackdev I figured it out, I wasn't iterating over the entire array, the logic was working but I was only going from ar1.length instead of ne.length lol. Thanks for the help!
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@longnt80 thanks
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:+1:
@CodeAstor :+1:
I know my thinking is a bit off. As splicing out i will mess it up for the next loop butI keep getting type error because arr[i] isnt a string so I cant use indexOf() but struggling to fix
function destroyer(arr) {
for(var i=0; i<arr.length;i++){
for(var j=1; j<(arguments.length); j++){
if (arr[i].toString.indexOf(arguments[j]) >=0){
arr.splice(i,1);
}
}
}
return arr;
}
destroyer([1, 2, 3, 1, 2, 3], 2, 3);
can anyone tell me why I can’t use this[i].title instead of movie[i].title?
var movies = [
{
title: 'Troy',
rating: 5,
hasWatched: true
},
{
title: 'Alien: Covenant',
rating: 4.5,
hasWatched: true
},
{
title: 'Wonder Woman',
rating: 4.5,
hasWatched: false
},
{
title: 'Mad Max',
rating: 4,
hasWatched: true
}
];
for (var i = 0; i < movies.length; i++) {
if (movies[i].hasWatched === false) {
console.log('You have not seen ' + movies[i].title + ' - ' + movies[i].rating + ' stars');
} else {
console.log('You have seen ' + movies[i].title + ' - ' + movies[i].rating + ' stars')
}
}
am I on the right track?, kill what ever elements in my array are part of my arguements
@TraekWells
this would refer to the object window outside of an object.
mmm
@ivancsicsmarkus even if I replace every ‘movies’ instance with this besides the for loop, it still wouldn’t work?
‘this’*
@TraekWells @TraekWells What do you mean?
@TraekWells How?
@ivancsicsmarkus
for (var i = 0; i < movies.length; i++) {
if (this[i].hasWatched === false) {
console.log('You have not seen ' + thisi].title + ' - ' + this[i].rating + ' stars');
} else {
console.log('You have seen ' + this[i].title + ' - ' + this[i].rating + ' stars')
}
}
this wouldn’t work either?
@TraekWells Yes. I said
this refers to the window object not for the movies object.
@TraekWells
this works inside constructors. Than it refers to the current object.
@TraekWells But outside… it refers the (global)
window object.
carousel not working
@ivancsicsmarkus ahhhhh I see. Thanks for clearing that up. Makes sense why the code I posted wouldn’t work
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@shenoyabhijith you have to initialize it via jQuery:
$(document).ready(function(){
$('.carousel').carousel();
});
not working
@shenoyabhijith it's working on my end
@eyesore- did you show it yet?
@wikiwiggs Nah. Let me send you the link with all the test.
why is this
return (arguments[1].toString()).indexOf(value);Not the same as
var a1 = arguments[1].toString();
return a1.indexOf(value);
for reference the second example works
the first does not
@eyesore- Your killing me man, I haven't had the time to go learn up on ES6 yet
hi, can someone help me for Factorialize a Number exercise please?
@wikiwiggs the tests are written in ES6, but you can do the answer in ES5
@amelink i can help, I just did that one. First do you understand what a factorial is?
@wikiwiggs shit, I'll do it right now if you want me to. haha
@eyesore- I'm just confused since to me it looks like you created your own reduce function that was completely empty.
with the exception of you have defined parameters.
with the exception of you have defined parameters.
@willcoxDev
arguments is not an array. It is just array-like. Sometimes it behaves strangely, like above.
@wikiwiggs Oh, I made that for someone. They asked what way they could understand reduce better and I told them to implement it from scratch so I wrote all those tests to help them.
@willcoxDev I don't know what it is exactly, but I understand the example
@wikiwiggs I thought you wanted to give it a crack. Let me write the actual reduce function and I will send it to you.
@amelink example 6! is 6x5x4x3x2x1 2! is 2x1
so just create a loop
@eyesore- OK, I thought there was some sort of ES6 iterative definition magic going on or something.
and inside product *= i
@willcoxDev Haha not completely. Just in the tests. Pretty proud of those.
a factorial is just the number times every number below it down to 1
@wikiwiggs Paste this in and you have a reducer
function reduce(collection, iterator, accumulator) {
var accumUndefined = arguments.length < 3
collection.forEach(function(item){
if(accumUndefined) {
accumUndefined = false
accumulator = item
} else {
return accumulator = iterator(accumulator, item)
}
})
return accumulator
}
@willcoxDev I don't have the same example, mine was 5! = 1 2 3 4 5 = 120
I understand this example but I don't where to start to do it
whatever the number is
just times that number vy every other number below it
5x4x3x2x1 = 120
so just write a for loop that loops from i = 1 to i = number and times a variable product by i each loop then return the product
@eyesore- Is that how it is actually written?
@wikiwiggs I'm not sure if that is the one that is used, but it will work as a reducer.
@eyesore- in the method i meant, ok, I was just curious.
@wikiwiggs Also, each browser engine may have their own.
@eyesore- good to know, do you know of a reference for built-ins on a per browser basis?
@amelink something liek this
function factorial(num){
var result = 1;
for (var i=1; i<num; i++){
result *= i;
}
return result;
}
factorial(5);
@wikiwiggs I couldn't think of another way to implement it. I don't think it's public. Specially with
sort that is one everyone takes pride in, but I think the majority use a radix sort.
I love the sprt method.
especially when I can spell it correctly
Haha have you implemented one before?
thank you @willcoxDev for your explanations
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they are rough when it comes to performance.
I have, but I've done it in lisp a long time ago, and don't remember how I implemented it.
hey eyesore I have a doozy for you.
I sure love it in JS though
Oh, also for a browser reduce is probably produces with a for loop since that is better performing than forEach
What's up?
function destroyer(arr) {
var array = arguments[0];
var a1 = arguments[1].toString();
var a2 = arguments[2].toString();
array = array.filter(function(value){
return a1.indexOf(value);
});
array = array.filter(function(value){
return a2.indexOf(value);
});
return array;
}
destroyer([1, 2, 3, 1, 2, 3], 2, 3);
so this works
as long as there are only 2 arguments
after the array
obviously i need to do some sort of loop
What are you trying to do?
Is this Seek and Destroy?
yes
[1,2,3].indexOf("1")result: -1 <-- mean NOT found
WHY u toString ?
because you cant do indexOf() on an int
only a string
I get type error
i guess i am wrong
You can do indexOf on an Array
I tried
Its a prototype to string and array
You can also do a replace on a string
array = array.filter(function(value){
return arguments[1].indexOf(value);
What if you have a ton of arguments?
exactly
my issue
but the thing is
I cant use this code
You gotta loop through arguments, but you also have to keep in mind that arguments is not an Array
I get type error so I cannot simply iterate through them as in
return arguments[i].indexOf(value);
@willcoxDev sry u r right.. kind of...
indexOF only works on arrays and string..
indexOF only works on arrays and string..
@moigithub all g bro everyone learning, even the pros sometimes :D
@willcoxDev what u can do is
which will create an array.. but ofc this will only have 2 elements.. IF u pass more values to the func it wont work
[a1, a2].indexOf(value)which will create an array.. but ofc this will only have 2 elements.. IF u pass more values to the func it wont work
just use arguments[i] and push that into a new array, then you can operate on that array like an array
@wikiwiggs ok let me ive that a crack
you should still loop
Yeah, you have to loop. That is for sure.
the bigger picture here is learn how to do it well for all cases
After this you should implement filter from scratch haha I'll send you some tests.
ok let me do this first haha
i think im ontop something with the new array idea
@eyesore- I take issue with filter, map, and forEach
they all seem the same to me
with the exception of their name of course
Yeah, I can tell from that code the sent the last time haha
@eyesore- am I wrong, or do they actually all have the same mechanism?
@wikiwiggs I'm writing up an explanation on each
destroyer([1, 2, 3,4, 5, 6], 7, 8);arg1 = 1, arg2=2
Filter will create a new array with all items that pass your callback.
Map will create a new array from all the items being passed through your callback.
forEach will mutate the array with whatever callback you pass.
Map will create a new array from all the items being passed through your callback.
forEach will mutate the array with whatever callback you pass.
yes @willcoxDev
?
@willcoxDev First argument is the array.
arguments[0] is the array, arguments[1] is 7, arguments[2] = 8
destroyer([1, 2, 3,4, 5, 6], 7, 8);
// [1, 2, 3,4, 5, 6] = 1
// 7 = 2
// 8 = 3 var array = [];
for (var i=1; i<arr.length; i++){
array.push(arguments[i]);
}
is how I am making the new array
ur condition should be based on arguments.length instead
oh ok
@willcoxDev
arr is the same as arguments[0]
ok that worked
@wikiwiggs this is how filter works:
var filter = function(collection, test) {
var result = []
collection.forEach(function(item) {
if( test(item) ){
result.push(item)
}
})
return result
}
@wikiwiggs this is map:
var map = function(collection, iterator) {
var result = []
collection.forEeach(function(item) {
result.push(iterator(item))
})
return result
}
@eyesore- so filter is a truth collector?
and so is map
Yeah, pretty much. If it's true with whatever function you give it then it will throw it in the new array.
without the truth check
Map will throw it into the new array with whatever the function you give.
function destroyer(arr) {
var array = [];
for (var i=1; i<arguments.length; i++){
array.push(arguments[i]);
}
for (var j=0;j<array.length;j++){
array = array.filter(function(value){
return array[j].indexOf(value);
});
}
return array;
}
destroyer([1, 2, 3, 1, 2, 3], 2, 3);
Yeah. So if you want to + 1 each item or so forth
@willcoxDev You don't need the
j loop.
@willcoxDev that's where I use reduce.
You can make a copy of arguments with .slice
@willcoxDev Filter iterates
arr and indexOf iterates array.
@eyesore- That is the preferred ES5 way of turning arguments object into an array.
Yeah, I know.
but then again, I see all of these array methods as for loops anyway, so don't listen to me on this one.
Haha ^
@eyesore- So when I use filter, I normally pass in a function to operate on each element, and instead I should be passing a function that returns based on a truth boolean of comparison such as a<b return b-a
Yeah, you definitely want to be thinking of the output as a boolean.
which sounds like sort and reverse to me.
@eyesore- So am I over simplifying in seeing these all as for loops, and sorts?
Those keep all elements and just switches their position. Filter will knock out elements that dont fit your truth test.
Oh, without a doubt! They all have they're own functionality that help you in different ways.
but so would any other function that I create, if I put an if condition do this else do nothing correct?
Well I mean you could think that you can create all these functions, but why would you do that if it's something that is already made for you?
i want to center it using container
and add some padding between images
and add some padding between images
@eyesore- that's not quite it.
You get into the point of why use any prototypes? Why use jQuery? Why use JS, just write your own language.
Oh, shit. Ignore that.
What do you mean then?
I just see these as loops, so I leverage them to iterate in their own context without actually having to write the traditional for loop structure.
Oh, okay. I guess you could do that with map, reduce, and forEach.
You may fall into some issues with filter.
@willcoxDev Those methods are implicit loops suited for some specific thing.
well I think that most of the time, I'm hijacking my own functions return before filter cares to do anything with its own
ok I still dont get why this wont work
function destroyer(arr) {
var kill = [];
for (var i=1; i<arguments.length; i++){
kill.push(arguments[i]);
}
arr = arr.filter(function(value){
return kill.indexOf(value);
});
return arr;
}
destroyer([1, 2, 3, 1, 2, 3], 2, 3);this is returning [1,3,1,3]
My understanding is that it should use both values stored in kill but it only seems to be usings the first
@willcoxDev You need to return true/false from the callback function.
the array "kill" is storing [2, 3]
i checked
@wikiwiggs I would definitely suggest to not do that though /: Specially if you start working on a team. You are going to get yelled at constantly.
@eyesore- LOL, I see that
@willcoxDev You need to return false if
value is found on kill, and true otherwise.
Now you are returning the first index.
@willcoxDev
function destroyer(arr) {
var kill = [];
for (var i=1; i<arguments.length; i++){
kill.push(arguments[i]);
}
arr = arr.filter(function(value){
kill.push(value);
});
return arr;
}
destroyer([1, 2, 3, 1, 2, 3], 2, 3);
I'm doing this on purpose, it doesn't solve anything
it returns blank because you didnt change arguements to arr
Alright good. I was about to say something about that filter function.
function destroyer(arr) {
var kill = [];
for (var i=1; i<arr.length; i++){
kill.push(arr[i]);
}
arr = arr.filter(function(value){
kill.push(value);
});
return arr;
}
destroyer([1, 2, 3, 1, 2, 3], 2, 3);
try that
@eyesore- I was just showing inverse symmetry to see if he can pick up on the mistake
if you want more youll have to manually add it
@willcoxDev You need to compare that indexOf with
-1. Then it works.
@MANTENN That is actually wrong with what he is trying to do.
function destroyer(arr) {
var kill = [];
for (var i=1; i<arguments.length; i++){
kill.push(arguments[i]);
}
arr = arr.filter(function(value){
if (kill.indexOf(value) >= 0){
return false;
}
else{
return true;
}
});
return arr;
}
destroyer([1, 2, 3, 1, 2, 3], 2, 3);
@Masd925 Good Morning
@willcoxDev Just
return kill.indexOf(value)===-1; is simpler.
@Lumexralph Morning.
@eyesore arguments is undefined it wont loop
@MANTENN arguments is defined in every function. They are the parameters.
@eyesore I know, he only has one argument and its arr
@MANTENN Just look up the lesson man: Seek and Destroy
unless he did this
var arguuments = arr;
var arguuments = arr;
or its from a global value
That is wrong too.
@MANTENN Look at the last line, there are three arguments being passed to this one function
@MANTENN
arguments is a special keyword. It evaluates to an array-like object that holds all the passed arguments.
@MANTENN arguments is a local variable
@eyesore thanks I guess im not there yet.
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@Masd925 How's your night?
ok so
return kill.indexOf(value)===-1; returns only when the index isnt found?
@Lumexralph Fine. How was yours.
@willcoxDev It returns true if value is not found on kill, and false otherwise.
@MANTENN It's cool man. No problem.
@willcoxDev any time an index is not found in an array it is -1
@eyesore first time I hear of it
@Masd925 it was good
@MANTENN @eyesore- @wikiwiggs @MANTENN thanks
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@willcoxDev yes
@MANTENN You'll run into it more. It's really useful actually.
waht is it returning exactly
an invalid position in the index address to the array
@willcoxDev When you compare indexOf with
-1, it means is it not found?.
@mantenn Just be more open when someone opposes what you say man.
oh so it is returning only those that are not found and therfore the ones I want in the array
@eyesore ok'
@willcoxDev Yes, filter keeps those elements that when passed into the callback return true. So just the ones that are not found on kill.
So whatever turns to true in the filter function will be put into the new array
What he said
@eyesore- OK, so I'm going to tread lightly, because you know my tendancy already to use array methods like for loops.
what about them, in the way that I use them would be volitile in a team situation?
what about them, in the way that I use them would be volitile in a team situation?
@wikiwiggs So the biggest thing in a team situation is that it will confuse people on what you are really trying to do. Some may also add extra complexity that you do not need.
@eyesore- The reason for asking is this:
we are taught or should be taught early on what return does inside of a function correct?
we are taught or should be taught early on what return does inside of a function correct?
Let's say you make something and then leave the company. You used a filter when you were just trying to loop through something. The next person that gets the legacy code can think that it was supposed to filter something, but can't see what needs to be filtered.
Yeah, definitely. Everyone should know terminations. That's actually why I don't use semicolons.
You just want to be as clear as possible with your code. With your variable names and helper functions.
@eyesore- not just terminations, but highly specific return values (not all the time, but could be thought of that way).
Overall the biggest thing that I see is that it sends someone down the wrong path on what your code is doing.
If I saw that in production I wouldn't think that you were just trying to loop I would think that you just didnt know how to filter correctly.
@eyesore- I get that, but hey if we are in a team, then code reviews & pair programming should get everyone on the same page correct?
@willcoxDev Haha type coercion is wild.
@eyesore- Best way to obscure good code.
@wikiwiggs Definitely! Code Review is awesome. From my experience there is not as much pair programming... Specially in startups.
@Masd925 Do you use typescript or flow?
@eyesore floating-point inprecision, does it mention in wiki with ECC memory it can be fixed?
@eyesore- I'm just very curious on this, because I still don't necessarily see this as bad practice, counter-intuitive maybe (if you don't understand return)
@eyesore- No, just vanilla JS and angularJS at work.
"single-precision floating-point hardware"
good morning
@HeebieGeeBee Morning.
@HeebieGeeBee hello
Float in-precision is an issue in many languages. If it can be fixed that's cool. I haven't really ran into it impeding me from doing something.
thats what strings and truncate are for
having issues with CORS and my codepen coming from http... any way to change codepen to https? I thought it already was but I'm getting this error:
(Uncaught DOMException: Failed to read the 'contentDocument' property from 'HTMLIFrameElement': Blocked a frame with origin "http://codepen.io" from accessing a cross-origin frame.)
and this error:
(XMLHttpRequest cannot load https://quotesondesign.com/wp-json/posts?filter[orderby]=rand&filter[posts_per_page]=1&callback=. The 'Access-Control-Allow-Origin' header has a value 'https://s.codepen.io' that is not equal to the supplied origin. Origin 'http://s.codepen.io' is therefore not allowed access.)
@wikiwiggs Yeah, I mean with bad practice I do feel like 'Fuck you, it works' sometimes, but not everyone thinks the same and unfortunately people leave projects so the more uniform everyones code is and following certain guidelines the better.
@HeebieGeeBee Bro! Morning
@willwaymel try adding a cors request header
yeah, i added https://crossorigin.me/ but it still didn't work @MANTENN . I'm trying to figure out if I have to put something like what's described here https://www.html5rocks.com/en/tutorials/cors/
@willwaymel could be a server side issue.
weird thing is, it works fine on my mobile browser, and when someone else tried from their computer @MANTENN
@eyesore- so seeing how I constantly would have a tendancy to do this, would you consider it a reason to clone, and append the prototype in this case?
or just use the forEach method?
@wikiwiggs If it's something simple use forEach or if you want to create a new array use map. You also get into mutating which in my opinion it's better to not mutate.
hi guys can you assist me on the Random Quote Machine, The getJSON function which is pointed to API(https://api.forismatic.com/api/1.0/?method=getQuote&format=json&lang=en) does not return anything, but when I paste the url in the browser it returns data.
$(document).ready(function(){
$("#newQuote").on("click", function(){
$.getJSON("https://api.forismatic.com/api/1.0/?method=getQuote&format=json&lang=en", function(json){
$(".message").html(JSON.stringify(json));
});
});
});
@eyesore- yeah but then again who care if you mutate a slice correct?
@willwaymel could be a old browser on there pc
@wikiwiggs Keep in mind I don't take super hard stances on majority of things. Like semicolons or tabs VS spaces. There's another person on here that got in a huge argument with me about semicolons. His name is joseph I'm sure you;ve talked to him.
@kreuel are you using https for your codepen?
@wikiwiggs Yeah, if you mutate after copying then fuck it. That is a new array.
@MANTENN but that fact that it doesn't work on my browser...
@eyesore- I don't remember if I had
@HeebieGeeBee how do you specify what codepen uses?
There's another person on here that got in a huge argument with me about semicolons.
lol
I can imagine
@willwaymel ask @eyesore he is more experienced than me.
@Manish-Giri You use semicolons?
@MANTENN thanks
Hi @HeebieGeeBee, yes I'm using HTTPS, but i can also use HTTP any difference?
@willwaymel in your browser url bar it will say https
@wikiwiggs I think his username is revitualize or something like that.
how to align the card to center
?
@eyesore- no I meant about the Joseph bit
@kreuel what does it say in your devtools console?
sorry, wrong quote
still no bells ringing for me.
@HeebieGeeBee got it... :) sorry, thanks. Yeah I was looking in my mobile browser and it didn't show up right away
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@Manish-Giri Oh, I dont like that guy. I think he's an asshole.
@MANTENN thanks
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yeah I know the feeling..
@eyesore-
@Manish-Giri :wave:
@HeebieGeeBee :wave:
@wikiwiggs I'm surprised. He is on here all the time.
howdy
@Manish-Giri you been getting into arguments?
@Manish-Giri gggm :smiling_imp:
I am not really on here all that much.
@eyesore- hey @MANTENN said you might know what to do about this...
...
having issues with CORS and my codepen coming from http... any way to change codepen to https? I thought it already was but I'm getting this error:
(Uncaught DOMException: Failed to read the 'contentDocument' property from 'HTMLIFrameElement': Blocked a frame with origin "http://codepen.io" from accessing a cross-origin frame.)
and this error:
(XMLHttpRequest cannot load https://quotesondesign.com/wp-json/posts?filter[orderby]=rand&filter[posts_per_page]=1&callback=. The 'Access-Control-Allow-Origin' header has a value 'https://s.codepen.io' that is not equal to the supplied origin. Origin 'http://s.codepen.io' is therefore not allowed access.)
@Manish-Giri
@HeebieGeeBee lol, not lately anyway, I barely have the time these days for all that
how to align this card to center
@Lumexralph supper gggm :bow: :smiling_imp:
I just started FCC less than three weeks ago
@HeebieGeeBee the DevTool console is empty
@willwaymel you should be able to go to https://codepen.io/
@shenoyabhijith that's materialize-css right?
use their in-built class for centering
yeah
@kreuel post your codepen link
@Manish-Giri :smirk:
z
i tried center-align
wont work
I'm getting off now. Catch you all later.
@Manish-Giri
@eyesore- yeah it's already like that when I open my pen... i don't know why it's saying i'm coming from http.
@Lumexralph where's our partner in crime @joreyesl
is it align-center?
@eyesore- wait no. it just says "codepen.io/willwaymel/pen/BRONwq"
@eyesore- have a good evening
i need a bit of help the last instruction that says a should be assigned to b with = what do they mean by that
@HeebieGeeBee here it is: https://codepen.io/kreuel08/pen/bWxjLd?editors=1001
/morning
@eyesore- thanks... don't know why that one was opening from there
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@willwaymel Yeah, you want to run it via https. I think codepen is moving to only https.
@Manish-Giri been wondering where you guys are till you showed up, still wondering which programming wilderness @joreyesl is
@shenoyabhijith your card is in
col s12 m6
No problem
@eyesore- thanks for the array talks
it'll only span 6 columns
@Lumexralph lol yea havn't seen him much
@jazmynejack
var potato = something, something it is assigned to potato
@willwaymel works on my browser firefox 54.0
@HeebieGeeBee Was
potato your dummy variable?
@MANTENN and @eyesore- .... thanks again, was going to spend the next hour figuring out how to manually do the CORS . it was just displaying codepen.io (not revealing it was http) and my other pens were open in https. i changed it now and it works... :) thanks so much
willwaymel sends brownie points to @mantenn and @eyesore- :sparkles: :thumbsup: :sparkles:
:warning: willwaymel already gave eyesore- points
:warning: willwaymel already gave mantenn points
@Masd925 lol its spreading
that doesn't really help
now that my other page works.... another doesn't ... getting this error Uncaught DOMException: Failed to read the 'contentDocument' property from 'HTMLIFrameElement': Blocked a frame with origin "https://codepen.io" from accessing a cross--origin frame. ---
any ideas?
any ideas?
@kreuel use
https://api.forismatic.com/api/1.0/?method=getQuote&format=jsonp&lang=en&jsonp=? and your browser devtools console shows more than the codepen console
function trueOrFalse(wasThatTrue) {
if (wasThatTrue) {
return "Yes, that was true";
}
return "No, that was false";
}trueOrFalse(false);
if (wasThatTrue) {
return "Yes, that was true";
}
return "No, that was false";
}trueOrFalse(false);
@HeebieGeeBee okay now I see the red messages in the browser devtools console. will open a new browser and try again and try the new API. any reason why i have more codepen console?
what is wrong
in it
@Aimy24 check the string you're to return if it's same as FCC
@kreuel dont know what you mean
i check all
@willwaymel its the same CORS issue.
@Aimy24 I don't understand, what are the instructions from FCC?
@Lumexralph @HeebieGeeBee you guys hear about the Manchester thing
@MANTENN I know... this time my browser really does say its running at https though
@Manish-Giri what manchester thing?
@Manish-Giri yeah Ariana Grande concert
so sad
what happened?
@HeebieGeeBee there was a bombing
it's not actually the exact same, before it was pointing out that i was at http://codepen @MANTENN
22 dead, more than 50 injured
@Manish-Giri very sad.... will we ever no peace again?
@HeebieGeeBee You use
potato because you are afraid of grain lectins?
havent looked at any news
@Manish-Giri that's terrible. where was this?
@Lumexralph to be fair there never has been peace
@Masd925 not afraid
@willwaymel Manchester Arena at an Ariana Grande concert
Manchester, UK
@Manish-Giri no way
yup
@HeebieGeeBee violence is kind of the increase across countries and continents
@HeebieGeeBee So no greater message there at all?
most people there were teens
just that potatoes are awesome
damn!
@HeebieGeeBee the new API that you've provided solved the issue and I opened by CodePen on a new Incognito Page and it does not have any red messages in the DevTool console. Just curious why did you use JSONP instead of JSON? then add jsonp=? parameter at the end.
@MANTENN can you check and see if you get errors loading this one? https://codepen.io/willwaymel/pen/NjEVEM?editors=0010
@Lumexralph only a matter of time before ISIS says we did it
@kreuel gets rid of the CORS issue
how to get padding
between place hoder images
function repeatStringNumTimes(str, num) {
// repeat after me
for(var i=0;i<num;i++)
{
str+=str;
}
return str;
}
repeatStringNumTimes("abc", 3);
@willwaymel it loads fine except the font
output should be
abcabcabc
abcabcabc
@HeebieGeeBee thank you very much in assisting me on this issue.
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but it is
abcabcabcabcabcabcabcabc
abcabcabcabcabcabcabcabc
how to get padding between images
@ak4438 that code won't work
@Aimy24 your code is okay, if it not passes check the requirement, and if also that's ok, close and reload your browser
as is shown by your output
@Manish-Giri
@MANTENN you get an error on the font?
@willwaymel yes CORS error
@ak4438
str+=str; doubles the amount of added strings.
any idea why I am getting atype error here?
var array = str.split("");
var numArray = [];
numArray.push(array.charCodeAt(1));
@Manish-Giri sighs.....
@ak4438
result += str; would add it once.
@willcoxDev look for errors next to it
not on the line it only reports
it says array.charCodeAt is not a function
@willcoxDev you should use that on a string not an array
Yeh thats waht i figured
but the thing is a sting in the array?
"E" is at index pos 1
@willcoxDev nope
@shenoyabhijith use 'padding' instead of 'padding-left', it will padding all upper, right, bottom and left
wont work
checked @fsdmamun
@willcoxDev it could be that the that function is not inherited
@willcoxDev you should loop through the array to get the string then you can use that method
adding padding adds space only at the top and sides
@willcoxDev why don't you simply use
str.charCodeAt(1) ?
function lookUpProfile(firstName, prop){
// Only change code below this line
for (var i = 0;i < contacts.length; i++){
if(contacts[i].firstName && contacts[i].hasOwnProperty(prop)){
return contacts[i].prop;
}
}
// Only change code above this line
}
im confused now. the array is holding a list of strings?
i dunno lol
@willcoxDev why do you want to split the
str ? string
@ReactorboY prop is a variable and youre not comparing firstName to anything
@willcoxDev arrays can hold strings, numbers objects
my weather app suddenly stop working plz help... https://codepen.io/knazz/pen/LyXMrq
@ReactorboY i have a pseudo code that might help
I need to get the char code and minus 13 from it then convert back into a string
the idea was to split up the words and then concat them at the end
to reform the sentence
@willcoxDev
The charCodeAt() method returns the Unicode of the character at the specified index in a string.
won't work with array
The charCodeAt() method returns the Unicode of the character at the specified index in a string.
won't work with array
@willcoxDev
str is what?
help me out
need to add some padding
between placeholder images
function rot13(str) { // LBH QVQ VG!
var array = str.split("");
var numArray = [];
numArray.push(str.charCodeAt(1));
return str;
}
// Change the inputs below to test
rot13("SERR PBQR PNZC");
@ReactorboY
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
@willcoxDev you need to split the
str from the spaces not as characters
@willcoxDev
var array = str.split(" ");
yeh i had that before
so i got the words
@willcoxDev loop through the array, pick each string at the index then you can get the character unicode you want
@willcoxDev it returns the variable str
plz help ヾ(｡>﹏<｡)ﾉ https://codepen.io/knazz/pen/LyXMrq
Hi all, can someone explain the example in challenge 152:
var ourArray = [3,2,1];
ourArray[0] = 1; // equals [1,2,1]
?
var ourArray = [3,2,1];
ourArray[0] = 1; // equals [1,2,1]
?
@RenevandenHeuvel computers count from 0
so ourArray[0] is the first item in the array
ourArray[1] is the second and so on.
Hello I am stuck on "Using Objects for Lookup" which is lesson 205. Sorry I dont know how to link my code
@MANTENN i allready understood , but thans anyway :)
but I am stuck on how to integrate the value into the lookup
@RenevandenHeuvel
var myData = myArray[0];
var myData = myArray[0];
@mboesiger90 create an object like in the example and using the key of the object, you in bracket notation select it from the object and return it
thank you I figured it out
so var lookup = {
"Alpha" : "Adams",...
}
"Alpha" : "Adams",...
}
btw so I know for the future how do you copy code over to the chat here?
CTRL + C - to copy
CTRL + V to paste
it will be in pure text to mark it up hover over the icon below compose mode
ok thanks
It will have the letter m and an arrow point downwards
ah yep i see it
@Lumexralph ```
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";
}
}
} return "No such property";
```
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";
}
}
}
return "No such property";
to those that were helping me before I am almost there
function rot13(str) { // LBH QVQ VG!
var numArray = [];
for(var i=0;i<str.length;i++){
if((str.charCodeAt(i)) !== 32){
numArray.push(str.charCodeAt(i)-13);
}
else{
numArray.push(str.charCodeAt(i));
}
}
var finalStr = '';
for (var j=0;j<numArray.length;j++){
finalStr += String.fromCharCode(numArray[j]);
}
return finalStr;
}
// Change the inputs below to test
rot13("SERR PBQR PNZC");
>>>> F8EE C5DE CAM6 (meant to return FREE CODE CAMP)
@willcoxDev did you ever get your string split figured out?
It seems to be working for the most part but not quite
@wikiwiggs Is this Cesar's cipher?
@ReactorboY
.prop looks for property key "prop", not the key stored in parameter prop.
yes ceasars
@willcoxDev find a common pattern and shift each character based on it.
got that already but thnx @Masd925
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@willcoxDev you need to be able to subtract once you get beyond a certain point in the alphabet a whole lot more than 13
@willcoxDev First you need to test if the character is at range A-Z and only transform the charcode if it is.
@Masd925 regex
@MANTENN Yes, regexp or charcode check.
After M you need to start thinking this way
@willcoxDev Ceasars Cipher means
A will become N, and N will translated to A
@longnt80 no it depends on the pattern
its a wheel
i see the error now
@MANTENN No its a constant offset
its 13 away
always
that loops in on itself
there is not trick
@MANTENN i know, in this challenge it is like that
@wikiwiggs well that's what I meant
like a circle
yes
M becomes A
@wikiwiggs no in this challenge, 13 means
N become A
A -> 65 -> 65+13 -> 78 -> N
@willcoxDev meaning when I said subtract a whole lot more, if you are only relying on subtraction then it will change. @longnt80 OK, forgive me I am pretty tired. Make sure the math is right.
@wikiwiggs no problem, just make sure it doesn't confuse @willcoxDev
@longnt80 Thanks for looking out
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@willcoxDev Hows it working out?
Think I should take a break and continue tom. Bye
ok
I got it to work with 1 example
but my code is hacky and wont work with other symbols
i need to use regex
to check a match or something
function rot13(str) { // LBH QVQ VG!
var numArray = [];
for(var i=0;i<str.length;i++){
if((str.charCodeAt(i)) !== 32 && (str.charCodeAt(i)) >= 78){
numArray.push(str.charCodeAt(i)-13);
}
else if((str.charCodeAt(i)) !== 32 && (str.charCodeAt(i)) < 78){
numArray.push(str.charCodeAt(i)+13);
}
else if((str.charCodeAt(i)) === 32){
numArray.push(str.charCodeAt(i));
}
}
var finalStr = '';
for (var j=0;j<numArray.length;j++){
finalStr += String.fromCharCode(numArray[j]);
}
return finalStr;
}
// Change the inputs below to test
rot13("SERR PBQR PNZC");
@willcoxDev You should not care for charcode
32 (you should only care if the character is A-Z or something else). Just test if the charcode is between 65-90 and then if it is on the lower or top half.
yeh i acually just figured this out
without seeing ur repsonse
function rot13(str) { // LBH QVQ VG!
var numArray = [];
for(var i=0;i<str.length;i++){
if((str.charCodeAt(i)) <= 90 && (str.charCodeAt(i)) >= 78){
numArray.push(str.charCodeAt(i)-13);
}
else if((str.charCodeAt(i)) >= 65 && (str.charCodeAt(i)) < 78){
numArray.push(str.charCodeAt(i)+13);
}
else{
numArray.push(str.charCodeAt(i));
}
}
var finalStr = '';
for (var j=0;j<numArray.length;j++){
finalStr += String.fromCharCode(numArray[j]);
}
return finalStr;
}
// Change the inputs below to test
rot13("SERR PBQR PNZC");
no works
now
So it will only do the conversion on capital letters
i assume there is a much better solution though
@willcoxDev turn
str to uppercase first
Yeh thats true, the question specially states that all letters will be uppercase though so i didnt bother
@longnt80 Not required, but maybe reasonable.
yeh i just added it
str = str.toUpperCase(); under the function at the top
thanks for all your help guys
@Masd925 @longnt80 @wikiwiggs @MANTENN thanks
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@willcoxDev You can solve it with map/replace and one remainder operation. Even on one line.
:+1:
@Masd925
one remainder operation
I can't think of the use for this in this case? Why?
@longnt80
cc%26+65 will do the charcode mapping.
@Masd925 what is
cc%26?
cc?
@longnt80 That uses the remainder operator to map the charcode
cc, once it has been tested to be on the range A-Z cc>64 && cc<91
26 means the number of aphabet letters
function rot13(str) {
return str.split("").map(function(char){
var cc = char.charCodeAt(0);
return (cc>64 && cc<91) ? String.fromCharCode(cc%26+65) : char;
}).join("");
}
Can anyone help me understand how to use APIs with jquery.
I dont get it at all.
I dont get it at all.
@longnt80 I think there are clearer ways to do the mapping, but that is a compact way.
@Masd925 thanks, I'll take a look
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@Masd925 btw, in this line
return (cc>64 && cc<91) ? String.fromCharCode(cc%26+65) : char;, I know the ? and : create an if statement. But what is the term for it or can you give me a link to read about it?
@longnt80 Conditional operator / ternary operator. Great way to obscure code.
@Masd925 thanks again
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:warning: longnt80 already gave masd925 points
Hey can anyone help me? I am supposed to Declare a local variable myVar inside myLocalScope. I don't understand what is wrong. It says I have not completed the "No global myVar variable" part of the challenge?
function myLocalScope() {
'use strict';
var myVar = "Hello";
console.log(myVar);
}
myLocalScope();
// Run and check the console
// myVar is not defined outside of myLocalScope
// Now remove the console log line to pass the test
@TheDevWizard try moving your
console.log(myVar) statement to immediately after myLocalScope();
@wikiwiggs That would be the non-working intermediate step, where one is meant to see the error such code causes
and then of course remove like the comments say
and run again
this exercise is all about proving to yourself that you can't access the local variable.
I'd say "try reloading the page".
At least for me, this code worked at the second click on "Run tests". Not sure why not on first.
the first part of the challenge is trying to see