JSFiddle - React, Tailwind, and code Playground

by Ranjan Kumar

JavaScript

var sampleArray = [];
for(var i=0;i<10000;i++){
    sampleArray[i]=i;
}

console.time("measureforin");
for(var k in sampleArray){}
console.timeEnd("measureforin"); // 3.495 ms

console.time("measurefor");
for(var j =0, len = sampleArray.length; j < len; j++){}
console.timeEnd("measurefor"); // 0.037 ms