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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; rv:111.0) Gecko/20100101 Firefox/111.0

Browser: Firefox 111

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
var	20392440.0 Ops/sec
let	20115460.0 Ops/sec
const	20327190.0 Ops/sec
sloppy	18164710.0 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()