Square Each Number In An Array In Javascript

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. Original co

Solution 1:

Math.sqrt gives you square root not square of a number. Use Math.pow with second argument of 2.

Solution 2:

How about that ?

function (arr) {
  return arr.map(function (x) {
    returnMath.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.

Solution 3:

The first sample is taking the square root, not squaring the value. To square you want to use

Math.pow(arr[i],2);

Solution 4:

Here is the function write with ES6Exponentiation (**):

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

Solution 5:

The original code is taking the square root of the value. The second version is multiplying the value with itself (squaring it). These are inverse operations