Run results for: String reversal

Run details:

User agent: Mozilla/5.0 (X11; CrOS x86_64 14541.0.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser: Chrome 126

Operating system: Chrome OS 14541.0.0

Device Platform: Desktop

Date tested: one year ago

Array.from+toReversed+join

1K/s

spread+toReversed+join

1K/s

backwards function*

584/s

toReversed.call+join

346/s

View exact numbers

Test name	Executions per second
✓ Array.from+toReversed+join	1,154 Ops/sec
spread+toReversed+join	1,137 Ops/sec
backwards function*	584 Ops/sec
toReversed.call+join	346 Ops/sec

Script Preparation code:

let string = Array.from({
    length: 50
}, (_, index) => index).join('')

function* backwards(iterable) {
    for (let {
            length
        } = iterable; length--;) yield iterable[length]
}

Tests:

spread+toReversed+join
for(let i = 300; i--;)var t = [...string].toReversed().join('')
Array.from+toReversed+join
for(let i = 300; i--;)var t = Array.from(string).toReversed().join('')
toReversed.call+join
for(let i = 300; i--;)var t = [].toReversed.call(string).join('')
backwards function*
for(let i = 300; i--;)var t = [...backwards(string)]