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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser: Chrome 133

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

set

14.1M/s

includes

1.7M/s

indexOf

1.6M/s

findIndex

1.2M/s

find

1.2M/s

View exact numbers

Test name	Executions per second
✓ set	14,138,231 Ops/sec
includes	1,684,488 Ops/sec
indexOf	1,638,403 Ops/sec
findIndex	1,241,294 Ops/sec
find	1,235,820 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);}