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

Old school and simpler :

let myarray = [5, 10, 3, 2], result = [];

for (let i = 0, s = myarray[0]; i < myarray.length; i++, s += myarray[i]) result.push(s);

console.log(result); // [5, 15, 18, 20]