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

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:129.0) Gecko/20100101 Firefox/129.0

Browser: Firefox 129

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

const

5.4M/s

let

5.2M/s

var

4.2M/s

View exact numbers

Test name	Executions per second
✓ const	5,400,322 Ops/sec
let	5,220,104 Ops/sec
var	4,240,506 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()