FreeCodeCamp/HelpFrontEnd

Get help on our Front End Development projects.

markclynch

@markclynch

I looked at Javascript briefly, but thought nah that's for losers who can't code for realz

Bjorn van de Peut

@bjorno43

Well if you know C++, todays languages should be quite the breeze, haha

markclynch

@markclynch

I "knew" it sorta, theoretically.

I never used it a day in my life, learned it in Comp Scie

then got into finance instead

They are easier to learn.

but I'm not sure they're tougher to master

Bjorn van de Peut

@bjorno43

Oh ok. I only did C++ once. I was running a private World of Warcraft server and that was made in C++. So I started messing around with that

Next gigi hadid💁

@1Droka_twitter

WHAT i completed 11 of 1408 coding challenges :ok_woman:

markclynch

@markclynch

I'd like to re-learn C++ at some point and help my cryptocurrency's main dev doing stuff, but it's gonna take a lot

Bjorn van de Peut

@bjorno43

@1Droka_twitter There you go :smile: Brace yourself though. It'll get progressively harder

markclynch

@markclynch

yeah, it'll start getting really annoying, get used to coming to this chat room :)

Bjorn van de Peut

@bjorno43

I've dropped C++ after that. Picked up C# and finished my master in software engineering with it last year

markclynch

@markclynch

@bjorno43 You like C# that much better?

Bjorn van de Peut

@bjorno43

@markclynch It's a lot easier than C++ and OOP. So ye, I definitely prefer it

AlbertoGiambone

@AlbertoGiambone

const realNumberArray = [4, 5.6, -9.8, 3.14, 42, 6, 8.34];
const squareList = (arr) => {
"use strict";
function inter (int) {
return int.isInteger;
};
const squaredIntegers = realNumberArray.filter(inter);

I don't know why this don't return an array of Int...
someone can help me?

alpox

@alpox

@AlbertoGiambone You forgot the () to call the function isInteger --> int.isInteger()

AlbertoGiambone

@AlbertoGiambone

if I put () this is the message: int.isInteger is not a function. (In 'int.isInteger()', 'int.isInteger' is undefined)

@alpox if I put () this is the message: int.isInteger is not a function. (In 'int.isInteger()', 'int.isInteger' is undefined)

alpox

@alpox

@AlbertoGiambone Right, i'm still half asleep it seems :D

AlbertoGiambone

@AlbertoGiambone

@alpox ;)

alpox

@alpox

The function is Number.isInteger(int)

The function isInteger exists only on the Number constructor

See https://developer.mozilla.org/de/docs/Web/JavaScript/Reference/Global_Objects/Number/isInteger

AlbertoGiambone

@AlbertoGiambone

@alpox ok, now this is the output: squaredIntegers should be [16, 1764, 36]

alpox

@alpox

Until now your output should be [4, 42, 6]

You still have to square them

Mandeep Sharma

@mandeephub

Can any one tell how to test web app

AlbertoGiambone

@AlbertoGiambone

@alpox ok, I wrote this:
function inter (int) {
return Number.isInteger();
};
const squaredIntegers = Math.pow(realNumberArray.filter(inter), 2);
but off course is not working ;)

alpox

@alpox

@AlbertoGiambone Yea you cannot set an array to the power of 2 :D

You have to target each number

So what you are looking for is the method .map

AlbertoGiambone

@AlbertoGiambone

@alpox thanks!

alpox

@alpox

@AlbertoGiambone np

hellhound123

@hellhound123

Hey guys, I'm trying to get radio buttons working on my survey form, but my input labels seem to be affected by my focus selectors that I used before. How can I get them to be below the title? I don't really want to use a <p> or heading element, or is that the only way? Here's the pen: https://codepen.io/Pixel123/pen/NzByep

AlbertoGiambone

@AlbertoGiambone

I need to square one array, I try to use " const squaredIntegers = a.map(Math.pow(a, 2));
"
but is non working..

Aditya

@ezioda004

@AlbertoGiambone .map() takes a callback function, so it should be const squaredIntegers = a.map(val => Math.pow(val, 2));

AlbertoGiambone

@AlbertoGiambone

@ezioda004 this don't return the square of the array

Aditya

@ezioda004

@AlbertoGiambone Seems to be working

const a = [2, 3, 4];
const squaredIntegers = a.map(val => Math.pow(val, 2));
console.log(squaredIntegers) // [4, 9, 16]

AlbertoGiambone

@AlbertoGiambone

@ezioda004 ahhh ok,
but in FCC don't
const realNumberArray = [4, 5.6, -9.8, 3.14, 42, 6, 8.34];
const squareList = (arr) => {
"use strict";
// change code below this line
function inter (int) {
return Number.isInteger();
};
const a = realNumberArray.filter(inter);
const squaredIntegers = a.map(val => Math.pow(val, 2));
// change code above this line
return squaredIntegers;
};

Moisés Man

@moigithub

@AlbertoGiambone seems like isInteger function missing something
which value u testing ?

AlbertoGiambone

@AlbertoGiambone

@moigithub const realNumberArray = [4, 5.6, -9.8, 3.14, 42, 6, 8.34];

Moisés Man

@moigithub

function inter (int) {
   return Number.isInteger();  /// u not passing anything to that function
};
const a = realNumberArray.filter(inter);

u can check syntaxis /examples here
http://mdn.io/isinteger
https://www.w3schools.com/jsref/jsref_isinteger.asp

AlbertoGiambone

@AlbertoGiambone

@moigithub 16:39

const realNumberArray = [4, 5.6, -9.8, 3.14, 42, 6, 8.34];
const squareList = (arr) => {
"use strict";

function inter (int) {
return Number.isInteger(realNumberArray);
};
const a = realNumberArray.filter(inter);
const squaredIntegers = a.map(val => Math.pow(val, 2));

return squaredIntegers;
};
now yes, but it's still the same
now

Aditya

@ezioda004

@AlbertoGiambone Number.isInteger(realNumberArray); the argument passed is..wrong. The usage of isInteger is Number.isInteger(num) so for example

Number.isInteger(1.2) //false
Number.isInteger(3) //true

You're passing array instead, also you should look up documentation of .filter() and what parameters the callback function takes.

AlbertoGiambone

@AlbertoGiambone

@ezioda004 ahhh ok thank's

German Gamboa Gonzalez

@germangamboa95

@padunk Yeah those have been giving my a hard time. I am going to throw CSS grid in there instead of using Materialize's grid since it still uses floats and that might be the cause of that.

@developer4eto thanks

Pixxel123

@Pixxel123

Still struggling with my earlier pen, is there any way to only select certain <labels>? I've tried putting all the ones I want to have the same effect in a class, but it's still affecting a few that I don't want to be affected

Pixxel123

@Pixxel123

I've figured it out, just had to add different classes to them, and change the focus selector to the relevant class instead of pointing at the label tag!

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