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

Run details:

User agent: Mozilla/5.0 (Windows NT 5.1; rv:52.0) Gecko/20100101 Firefox/52.0

Browser: Firefox 52

Operating system: Windows XP

Device Platform: Other

Date tested: 7 years ago

Test name	Executions per second
Object.hasOwnProperty	1061415.1 Ops/sec
Object in	975346.4 Ops/sec
Array.indexOf	16290.5 Ops/sec
direct	1785414.6 Ops/sec
Array includes	18477.4 Ops/sec

Script Preparation code:

  var object = {},
      array = [],
      i, test = 500;
  
  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)

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

Object.hasOwnProperty

Object in

Array.indexOf

direct

Array includes