MeasureThat.net

Run results for: undefined vs. typeof vs. in vs. hasOwnProperty 30

Object lookup performance

Go to the benchmark
Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36
Chrome 78
Windows
Desktop
5 years ago
Test name Executions per second
undefined 3332628.8 Ops/sec
typeof 9414373.0 Ops/sec
in 9403065.0 Ops/sec
hasOwnProperty 7821605.5 Ops/sec
bool 8378716.0 Ops/sec
Undefined2 3393731.2 Ops/sec
undefined3 3363590.5 Ops/sec
undefined4 3359387.8 Ops/sec
Script Preparation code:
AخA
 
var obj = { a: 1, b: 2, c: 3, d: 4, e: 5 };
Tests:

  • undefined

     
    if(undefined !== obj['d']){}

  • typeof

     
    if('undefined' !== typeof obj['d']){}

  • in

     
    if('d' in obj){}

  • hasOwnProperty

     
    if(obj.hasOwnProperty( 'd' )){}

  • bool

     
    if(!!obj['d']){}

  • Undefined2

     
    if(obj['d']!==undefined){}

  • undefined3

     
    if(obj['d']!=undefined){}

  • undefined4

     
    if(obj['d']==undefined){}