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

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:109.0) Gecko/20100101 Firefox/115.0

Browser: Firefox 115

Operating system: Windows 7

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

const

11.6M/s

let

11.6M/s

var

10.7M/s

View exact numbers

Test name	Executions per second
✓ const	11,601,848 Ops/sec
let	11,569,549 Ops/sec
var	10,674,240 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()