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

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Firefox/60.0

Browser: Firefox 60

Operating system: Linux

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Object.hasOwnProperty	15544820.0 Ops/sec
Object in	15994940.0 Ops/sec
Array.indexOf	415014.7 Ops/sec
direct	16124700.0 Ops/sec
Array includes	391667.9 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)

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