Run results for: Reverse and find vs rediceRight vs find index vs find last

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:123.0) Gecko/20100101 Firefox/123.0

Browser: Firefox 123

Operating system: Linux

Device Platform: Desktop

Date tested: 2 months ago

Test name	Executions per second
Reverse and find	2865037.0 Ops/sec
rediceRight	619960.5 Ops/sec
findLastIndex	22126140.0 Ops/sec
findLast	22189690.0 Ops/sec
ReduceRight and slice	647196.1 Ops/sec

Script Preparation code:

test = 'Low-life writer and unrepentant alcoholic Henry Chinaski was born to survive. After decades of slacking off at low-paying dead-end jobs, blowing his cash on booze and Women, and scrimping by in flea-bitten apartments, Chinaski sees his poetic star rising at last. Now, at fifty, he is reveling in his sudden rock-star life, running three hundred hangovers a year, and maintaining a sex life that would cripple Casanova'.split('');

Tests:

Reverse and find
test.reverse().find(s => s === 'f')
rediceRight
test.reduceRight((r, s) => (r || (s === 'f' ? s : r)), undefined)
findLastIndex
test[test.findLastIndex(s => s === 'f')]
findLast
test.findLast(s => s === 'f')
ReduceRight and slice
test.slice(0).reduceRight((r, s, i, arr) => (r || (s === 'f' ? (arr.length = 0, s) : r)), undefined)

Run results for: Reverse and find vs rediceRight vs find index vs find last

Reverse and find

rediceRight

findLastIndex

findLast

ReduceRight and slice