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

Run details:

User agent: Mozilla/5.0 (X11; U; Linux x86_64; en-GB) Gecko/20162614 Firefox/101.0

Browser: Firefox 101

Operating system: Linux

Device Platform: Desktop

Date tested: 11 months ago

Test name	Executions per second
var	14280190.0 Ops/sec
let	13882180.0 Ops/sec
const	14256810.0 Ops/sec
sloppy	9298281.0 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()