Question

16

Sum two arrays in single iteration

rated 0 times [ 18] [ 2] / answers: 1 / hits: 139977 / 10 Years ago, sat, june 7, 2014, 12:00:00

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];

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.

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santiago

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3 Years ago

answered 10 Years ago arthur · Accepted Answer

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]