Run results for: Set has vs object key - small object, no caching

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36

Browser: Chrome 134

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Set.has

20.0M/s

Includes

15.9M/s

Object[key]

14.9M/s

View exact numbers

Test name	Executions per second
✓ Set.has	19,964,588 Ops/sec
Includes	15,876,717 Ops/sec
Object[key]	14,940,740 Ops/sec

Script Preparation code:

var obj = {
  '.': true,
  ' ': true,
  ',': true,
  ';': true,
};
var array = Object.keys(obj);
var set = new Set(array);

function getKey() {
  return array[Math.floor(Math.random() * array.length)];
}

function getNonKey() {
  return Math.random() > 0.5 ? '!' : '?';
}

Tests:

Includes
array.includes(getKey()) && array.includes(getNonKey())
Object[key]
obj[getKey()] && obj[getNonKey()]
Set.has
set.has(getKey()) && set.has(getNonKey())

Run results for: Set has vs object key - small object, no caching

performance comparison of looking up a value from a set

Includes

Object[key]

Set.has