Run results for: Reassignment of Var vs Const vs Let

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36

Browser: Chrome 137

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Const

280.0M/s

Const from inline function

277.8M/s

Let

257.2M/s

Var

251.1M/s

View exact numbers

Test name	Executions per second
✓ Const	279,989,984 Ops/sec
Const from inline function	277,826,560 Ops/sec
Let	257,166,944 Ops/sec
Var	251,101,504 Ops/sec

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Tests:

Var
function foo() { var x = { value: 10 } x = { value: 11 } }
Const
function foo() { const x = { value: 10 } x.value = 11 }
Let
function foo() { let x = { value: 10 } x = { value: 11 } }
Const from inline function
function foo() { const bar = () => { const x = {value: 11} } const y = bar() }