Run results for: indexOf vs findIndex vs for vs while vs indexed - 100 items

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

indexOf

5.8M/s

while

2.1M/s

for

2.1M/s

indexed

1.2M/s

findIndex

899K/s

View exact numbers

Test name	Executions per second
✓ indexOf	5,753,934 Ops/sec
while	2,143,603 Ops/sec
for	2,088,736 Ops/sec
indexed	1,220,226 Ops/sec
findIndex	899,142 Ops/sec

Script Preparation code:

var exampleItem1 = 'You will never find me!';
var exampleItem2 = 'I am invisible!';
var exampleArray = Array(100).fill('').map((x, i) => x + (i + 1));
var compare1 = x => x === exampleItem1;
var compare2 = x => x === exampleItem2;

Tests:

findIndex
exampleArray.findIndex(compare1); exampleArray.findIndex(compare2);
indexOf
exampleArray.indexOf(exampleItem1); exampleArray.indexOf(exampleItem2);
for
let index1 = null; let index2 = null; for (let i = 0, l = exampleArray.length; i < l; i += 1) { if (index1 === null && compare1(exampleArray[i])) { index1 = i; continue; } if (index2 === null && compare2(exampleArray[i])) { index2 = i; continue; } if (index1 !== null && index2 !== null) break; }
while
let index1 = null; let index2 = null; let i = -1, l = exampleArray.length; while (++i < l) { if (index1 === null && compare1(exampleArray[i])) { index1 = i; continue; } if (index2 === null && compare2(exampleArray[i])) { index2 = i; continue; } if (index1 !== null && index2 !== null) break; }
indexed
const indexes = {}; for (let i = 0, l = exampleArray.length; i < l; i += 1) { indexes[exampleArray[i]] = i; } let index1 = indexes[exampleItem1]; let index2 = indexes[exampleItem2];