Benchmark: javascript var vs let vs const

Tests:

var
(function () { var arr = [55, 21, 807, 41, 56, 66, 202]; var num = 4; var str = "Lorem ipsum"; var bool = true; var nil = null; console.log(arr, num, str, bool, nil); })();
let
(function () { let arr = [55, 21, 807, 41, 56, 66, 202]; let num = 4; let str = "Lorem ipsum"; let bool = true; let nil = null; console.log(arr, num, str, bool, nil); })();
const
(function () { const arr = [55, 21, 807, 41, 56, 66, 202]; const num = 4; const str = "Lorem ipsum"; const bool = true; const nil = null; console.log(arr, num, str, bool, nil); })();

Rendered benchmark preparation results:

Previous results

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 YaBrowser/24.4.0.0 Safari/537.36

Browser/OS: Yandex Browser 24 on Windows

var

105K/s

let

103K/s

const

102K/s

View exact numbers

javascript var vs let vs const (version: 0) Benchmark.js