JSFiddle - React, Tailwind, and code Playground

JavaScript

var left = "12345"
var right = "12345"

function add(string) {
    string = string.split('');
    var sum = 0;
    for (var i = 0; i < string.length; i++) {
        sum += parseInt(string[i]);
    }
    return sum;
}

alert(add(left) === add(right));