JavaScript filter() method in 6 minutes! 🚰

// .filter() = creates a new array by filtering out
// elements with a callback

00:00:00 example 1
00:02:13 example 2
00:04:01 example 3

// ----------- EXAMPLE 1 -----------
let numbers = [1, 2, 3, 4, 5, 6, 7];

function isEven(element){
return element % 2 === 0;
}

function isOdd(element){
return element % 2 !== 0;
}

[BroCodez]

// filter() = creates a new array by filtering out
// elements with a callback

// EXAMPLE 1
let numbers = [1, 2, 3, 4, 5, 6, 7];
let evenNums = numbers.filter(isEven);
let oddNums = numbers.filter(isOdd);

console.log(oddNums);

function isEven(element){
return element % 2 === 0;
}

function isOdd(element){
return element % 2 !== 0;
}

// EXAMPLE 2
let ages = [16, 17, 17, 18, 19, 20, 65];
let adults = ages.filter(isAdult);
let children = ages.filter(isChild);

console.log(children);

function isAdult(element){
return element >= 18;
}

function isChild(element){
return element < 18;
}

// EXAMPLE 3
const words = ['apple', 'orange', 'kiwi', 'banana', 'pomegranate', 'coconut', ];
const longWords = words.filter(getLongWords);
const shortWords = words.filter(getShortWords);

console.log(shortWords);

function getShortWords(element){
return element.length <= 6;
}

function getLongWords(element){
return element.length > 6;
}

[joehaar]

I'm learning Python with your videos. The best material I could find so far. Thank you, bro.

[Aarif]

You made the code structure easier for me. Thank you so much brother❤

[xzex]

One bad thing about JS is that it works when there is errors and it don't caught errors like python or ... and shows unexpected behavior due to these errors, I wonder if there is any linter for this kind of situation . but believe me it got 30 minutes to find that i had a typo in element.lenght and I did not see it . end everything work like there is nothing but with a bug

[xzex]

I use expressions element % 2 for odd or return !( element % 2), are these expressions are equal like == or strictly === 0 when we don't mention them ??

[sportsknowledge]

Please create small small project in js

[nikolabosevski]

One thing about JS that has been a bit confusing is as in your example about isEven function even thoufh it takes a parameter when you define it, when you use it in the .filter method you dont pass an argument in it. Why is that? I have just always taken it for granted but im genuinely curious why it works that way