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

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_0_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.0 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 17

Operating system: iOS 17.0.1

Device Platform: Mobile

Date tested: 2 years ago

Benchmark engine: Benchmark.js

Object in

6.4M/s

direct

6.4M/s

Object.hasOwnProperty

6.4M/s

Set has

4.4M/s

Array.indexOf

581K/s

Array includes

23K/s

View exact numbers

Test name	Executions per second
✓ Object in	6,436,796 Ops/sec
direct	6,421,681 Ops/sec
Object.hasOwnProperty	6,381,985 Ops/sec
Set has	4,371,466 Ops/sec
Array.indexOf	580,533 Ops/sec
Array includes	22,965 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.hasOwnProperty
object.hasOwnProperty('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)