Javascript - Sum two arrays in single iteration

Question

I want to sum each value of an array of numbers with its corresponding value in a different array of numbers, and I want to do this without looping through each individual v

Answer 1

Just merge Popovich and twalters's answer.

Array.prototype.SumArray = function (arr) {

        var sum = this.map(function (num, idx) {
          return num + arr[idx];
        });

        return sum;
    }
var array1 = [1,2,3,4];
var array2 = [5,6,7,8];
var sum = array1.SumArray(array2);
console.log(sum); // [6,8,10,12]