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 value.
So:

var array1 = [1,2,3,4];
var array2 = [5,6,7,8];

var sum    = [6,8,10,12];

But, I'd love to do it in one fell swoop, instead of doing this:

for(var i = 0; i < array1.length; i++){
   sum.push(array1[i] + array2[i]);
}

Can anyone think of a way? I'm pretty stumped.

Answer 1

I know this is an old question but I was just discussing this with someone and we came up with another solution. You still need a loop but you can accomplish this with the Array.prototype.map().

var array1 = [1,2,3,4];
var array2 = [5,6,7,8];

var sum = array1.map(function (num, idx) {
  return num + array2[idx];
}); // [6,8,10,12]