Creating an array of cumulative sum in javascript

Question

This is an example of what I need to do:

var myarray = [5, 10, 3, 2];

var result1 = myarray[0];
var result2 = myarray[1] + myarray[0];
var result3 = myarray         


        

Answer 1

Another clean one line solution with reduce and concat

var result = myarray.reduce(function(a,b,i){ return i === 0 ?  [b]: a.concat(a[i-1]+b);},0);
//[5, 10, 3, 2] => [5, 15, 18, 20]