JSFiddle - React, Tailwind, and code Playground

JavaScript

var arr = [];

for (var i = 0; i < 100000000; i++) { 
	arr[i] = i;
}

console.time('Test');
var length = arr.length;
for (var i = 0; i < length; i++) { }
console.timeEnd('Test');

console.time('Test2');
for (var i = 0; i < arr.length; i++) { }
console.timeEnd('Test2');