Run results for: String in Array: Set vs Object lookup vs IndexOf vs includes vs findIndex vs find v2

Run details:

User agent: Mozilla/5.0 (Android 12; Mobile; rv:133.0) Gecko/133.0 Firefox/133.0

Browser: Firefox Mobile 133

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

object lookup

735K/s

set

573K/s

includes

292K/s

indexOf

283K/s

find

197K/s

findIndex

193K/s

View exact numbers

Test name	Executions per second
✓ object lookup	734,849 Ops/sec
set	572,913 Ops/sec
includes	291,638 Ops/sec
indexOf	283,145 Ops/sec
find	196,541 Ops/sec
findIndex	193,293 Ops/sec

Script Preparation code:

var arr = [];
var i = 0;
while (i <= 10) arr[i] = ('' + i++);
var testSet = new Set(arr);
var testObj = {};
for (const a of arr) {
  testObj[a] = true;
}


var randomKeys = [];
i = 0;
while (i <= 50) {
 randomKeys.push(''+Math.round(Math.random(50000) + 5000));
  i++;
}

Tests:

indexOf
for (const key of randomKeys) {const index = arr.indexOf(key);}
includes
for (const key of randomKeys) {const index = arr.includes(key);}
find
for (const key of randomKeys) {const index = arr.find(item => item == key);}
findIndex
for (const key of randomKeys) {const index = arr.findIndex(item => item == key);}
set
for (const key of randomKeys) {const index = testSet.has(key);}
object lookup
for (const key of randomKeys) {const index = testObj[key];}