dbg

main.js

const sum = require("util");

function runProgram(arr) {
    const result = sum(arr);
    return `result is ${result}`;
}

const result = runProgram([undefined, 1,2,3,4,5,-1,"3"]);
console.log(result); //result is 14

util.js

(function callModuleChecker(){
    result = new Date();
    console.log("WELCOME UTIL MODULE : " + result);
})();

module.exports.sum = (arr) => {
    result = result || 0;

    for (const i = 0; i < arr.length; i++) {
        if (typeof arr !== undefined) continue;
        result += arr[i]
    }

    return result;
}