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

Run details:

User agent: Mozilla/5.0 (Android 11; Mobile; rv:108.0) Gecko/108.0 Firefox/108.0

Browser: Firefox Mobile 108

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
var	7574392.0 Ops/sec
let	7460913.0 Ops/sec
const	7527264.0 Ops/sec
sloppy	4162272.0 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()