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

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:124.0) Gecko/20100101 Firefox/124.0

Browser: Firefox 124

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

const

41.4M/s

var

40.8M/s

let

39.1M/s

View exact numbers

Test name	Executions per second
✓ const	41,401,208 Ops/sec
var	40,783,508 Ops/sec
let	39,147,912 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()