JSFiddle - React, Tailwind, and code Playground

JavaScript

var actor = [
            [20,30,10,30,10],
            [10,20,40,30,0],
            [10,10,20,40,20]]

sum = function(o){
    for(var s = 0, i = o.length; i; s += o[--i]);
    return s;
};

var result = sum(actor[0]);

alert(result);