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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36

Browser: Chrome 130

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

indexOf

7.3M/s

for

2.3M/s

while

2.2M/s

indexed

1.6M/s

findIndex

1.1M/s

View exact numbers

Test name	Executions per second
✓ indexOf	7,275,522 Ops/sec
for	2,332,883 Ops/sec
while	2,201,601 Ops/sec
indexed	1,620,155 Ops/sec
findIndex	1,111,516 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];