Question

I have two arrays of equal length, and I need to multiply the corresponding (by index) values in each, and sum the results.

For example

var arr1 = [2,3,4,5];
var arr2 = [4,3,3,1];

would result in 34 (4*2+3*3+4*3+5*1).

What’s the simplest to read way to write this?

Answer 1

var sum = 0;
for(var i=0; i< arr1.length; i++) {
    sum += arr1[i]*arr2[i];
}