# TIL (Today I Learned)

til.md

TIL (Today I Learned)

Map, Filter, Reduce and Arrow Functions w/ Javascript

Inspiration

const numbers = [1, 2, 3, 4];
const doubled = numbers.map(number => number * 2)
console.log("The doubled numbers are: ", doubled); // [2, 4, 6, 8]

const numbers = [1, 2, 3, 4];
const doubled_oneadded = numbers.map(number => number * 2).map(number => number + 1)
console.log("Numbers doubled, and has 1 added to it:", doubled_oneadded); // [ 3, 5, 7, 9 ]

const numbers = [1, 2, 3, 4];
const doubled_odd = numbers.filter(number => number % 2).map(number => number * 2)
console.log("The doubled odd numbers:", doubled_odd); [ 2, 6 ]

const numbers = [1, 2, 3, 4];
const sum_doubled = numbers.map(number => number * 2).reduce(((total, number) => total + number), 0);
console.log("The sum of the doubled numbers is:", sum_doubled); // 20