Run results for: const vs let vs var - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Android 11; Mobile; rv:109.0) Gecko/117.0 Firefox/117.0

Browser: Firefox Mobile 117

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

Benchmark engine: Benchmark.js

var

3.6M/s

const

3.1M/s

let

3.1M/s

View exact numbers

Test name	Executions per second
✓ var	3,580,366 Ops/sec
const	3,057,942 Ops/sec
let	3,055,718 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()