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/123.0.6312.52 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 123

Operating system: iOS 17.3

Device Platform: Mobile

Date tested: 2 years ago

Benchmark engine: Benchmark.js

var

28.2M/s

let

25.0M/s

const

24.2M/s

View exact numbers

Test name	Executions per second
✓ var	28,161,026 Ops/sec
let	25,023,350 Ops/sec
const	24,243,592 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()