Script Preparation code:
AخA
 
var obj = { a: 1, b: 2, c: 3, d: 4, e: 5 };
Tests:
  • undefined

     
    undefined !== obj.d;
  • typeof

     
    'undefined' !== typeof obj.d;
  • in

     
    'd' in obj;
  • hasOwnProperty

     
    obj.hasOwnProperty( 'd' );
  • bool

     
    !! obj.d;
Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Experimental features:

  • Test case name Result
    undefined
    typeof
    in
    hasOwnProperty
    bool

    Fastest: N/A

    Slowest: N/A

Latest run results:
Run details: (Test run date: 3 days ago)
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.84 Safari/537.36
Chrome 99 on Windows
View result in a separate tab
Test name Executions per second
undefined 324323616.0 Ops/sec
typeof 718730432.0 Ops/sec
in 717454208.0 Ops/sec
hasOwnProperty 104045064.0 Ops/sec
bool 715997568.0 Ops/sec