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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36

Browser: Chrome 137

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

set

9.4M/s

indexOf

1.4M/s

includes

1.3M/s

findIndex

900K/s

find

893K/s

View exact numbers

Test name	Executions per second
✓ set	9,356,521 Ops/sec
indexOf	1,400,382 Ops/sec
includes	1,346,178 Ops/sec
findIndex	900,225 Ops/sec
find	892,962 Ops/sec

Script Preparation code:

var arr = [];
var i = 0;
while (i <= 10) arr[i] = ('' + i++);
var testSet = new Set(...arr);


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);}