Run results for: Object.prototype.hasOwnProperty vs Object in vs Object[] vs Array.indexOf vs Array.includes vs Set.has

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.3 Safari/605.1.15

Browser: Safari 26

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 months ago

Test name	Executions per second
Object.prototype.hasOwnProperty	34819856.0 Ops/sec
Object in	210406352.0 Ops/sec
Array.indexOf	653348.4 Ops/sec
direct	215231936.0 Ops/sec
Array includes	225415520.0 Ops/sec
Set has	214400256.0 Ops/sec

Script Preparation code:

  var object = {},
      array = [],
      set = new Set(),
      i, test = 1000;
  
  for (i = 0; i < 1000; i++) {
   object['something' + i] = true;
   array.push('something' + i);
   set.add('something' + i);
  }

Tests:

Object.prototype.hasOwnProperty
Object.prototype.hasOwnProperty.call(object, 'something' + test)
Object in
('something' + test) in object
Array.indexOf
array.indexOf('something' + test) !== -1
direct
object['something' + test] === true
Array includes
array.includes('something' + test)
Set has
set.has('something' + test)

Run results for: Object.prototype.hasOwnProperty vs Object in vs Object[] vs Array.indexOf vs Array.includes vs Set.has

Object.prototype.hasOwnProperty

Object in

Array.indexOf

direct

Array includes

Set has