Square each number in an array in javascript

Question

I\'m trying to square each number in an array and my original code didn\'t work. I looked up another way to do it, but I\'d like to know WHY the original code didn\'t work.<

Answer 1

Use embedded for , for pretty syntax :

      var arr=[1,2,3,4] ;
      [for (i of arr) i*i ]; 

      //OUT : > [1,4,9,16]

Answer 2

Declarative Programming :)

let list = [1,2,3,4,5,6,7,8,9,10];
let result = list.map(x => x*x);
console.log(result);

Answer 3

How about that ?

function (arr) {
  return arr.map(function (x) {
    return Math.pow(x, 2);
  });
}

Array.map(func) applies the function to each element of the map and returns the array composed of the new values. Math.pow(base, exp) raises base to its exp power.

Answer 4

Here is the function write with ES6 Exponentiation (**):

let arr = [1, 6, 7, 9];
let result = arr.map(x => x ** 2);
console.log(result);

Answer 5

let arr = [1, 2, 3];
let mapped = arr.map(x => Math.pow(x, 2));
console.log(mapped);

Answer 6

This will work

const marr = [1,2,3,4,5,6,7,8,9,10]; console.log(marr.map((x) => Math.pow(x, 2)));