Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 Safari/537.36
Chrome 96
Mac OS X 10.15.7
Desktop
3 years ago
Test name Executions per second
Object.hasOwnProperty 2113662.0 Ops/sec
Object in 2768516.8 Ops/sec
direct 2918915.5 Ops/sec
Script Preparation code:
AخA
 
  var object = {},
      array = [],
      i, test = 1000;
  
  for (i = 0; i < 1000; i++) {
   object['something' + i] = {};
   array.push('something' + i);
  }
Tests:
  • Object.hasOwnProperty

     
    Object.prototype.hasOwnProperty.call(object, 'something' + test)
  • Object in

     
    ('something' + test) in object
  • direct

     
    !!object['something' + test]