"use strict"; const timeCall = require("./"); let dummyArray = new Array(20000).fill(0); let { value, time } = timeCall(() => { for (let i = 0; i < 1e3; i++) { dummyArray = dummyArray.map((value) => value + 1); } return dummyArray; }); console.log(time); // 386335402 console.log(value); // [ 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, ...