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

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_3_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/135.0.7049.53 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 135

Operating system: iOS 18.3.1

Device Platform: Mobile

Date tested: one year ago

Benchmark engine: Benchmark.js

Object.hasOwnProperty

38.6M/s

Object in

37.7M/s

direct

36.4M/s

Array.indexOf

877K/s

Array includes

296K/s

View exact numbers

Test name	Executions per second
✓ Object.hasOwnProperty	38,618,092 Ops/sec
Object in	37,659,524 Ops/sec
direct	36,408,168 Ops/sec
Array.indexOf	876,895 Ops/sec
Array includes	295,814 Ops/sec

Script Preparation code:

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