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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 11_4; rv:101.0) Gecko/20110101 Firefox/101.0

Browser: Firefox 101

Operating system: Mac OS X 11.4

Device Platform: Desktop

Date tested: 11 months ago

Test name	Executions per second
var	14454610.0 Ops/sec
let	14165470.0 Ops/sec
const	14297700.0 Ops/sec
sloppy	8720193.0 Ops/sec

Website performance monitoring

Tests:

var
var g = { e: [] } g.o = function(x) { g.e.push(...[1,2,3]) } g.o()
let
let 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()
sloppy
g = { e: [] } g.o = function(x) { g.e.push(...[1,2,3]) } g.o()