Benchmark: 6546878965987987987984981651324684654984658489465798654984659856416514698584

Tests:

while
const arreglo = [0,0,0,0,0,-4,-3,-3,-3,-3,-3] let i = 11 while (arreglo[i - 1] === -3) i-- i-- console.log(i)
lastIndexOf
const arreglo = [0,0,0,0,0,-4,-3,-3,-3,-3,-3] let i = 11 i = arreglo.lastIndexOf(-4) console.log(i)

Rendered benchmark preparation results:

Previous results

Test case name	Result
while
lastIndexOf

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Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36

Browser/OS: Chrome 105 on Windows

Test name	Executions per second
while	318438.6 Ops/sec
lastIndexOf	313589.1 Ops/sec

6546878965987987987984981651324684654984658489465798654984659856416514698584 (version: 0)