Run results for: const vs let vs var

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/120.0.6099.119 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 120

Operating system: iOS 17.3

Device Platform: Mobile

Date tested: 2 years ago

Benchmark engine: Benchmark.js

var

30.8M/s

let

29.2M/s

const

29.0M/s

View exact numbers

Test name	Executions per second
✓ var	30,801,328 Ops/sec
let	29,193,792 Ops/sec
const	28,952,262 Ops/sec

Tests:

var
var g = { e: [] } g.o = function(x) { g.e.push(...[1,2,3]) } g.o()
let
var g = { e: [] } g.o = function(x) { g.e.push(...[1,2,3]) } g.o()
const
const g = { e: [] } g.o = function(x) { g.e.push(...[1,2,3]) } g.o()