MeasureThat.net

Run results for: undefined vs. typeof vs. in vs. hasOwnProperty 32

Object lookup performance

Go to the benchmark
Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:79.0) Gecko/20100101 Firefox/79.0
Firefox 79
Windows
Desktop
4 years ago
Test name Executions per second
undefined 91090528.0 Ops/sec
typeof 219349440.0 Ops/sec
in 132360544.0 Ops/sec
hasOwnProperty 131976752.0 Ops/sec
bool 219486352.0 Ops/sec
Undefined2 95855224.0 Ops/sec
undefined3 96450120.0 Ops/sec
undefined4 96566920.0 Ops/sec
bool2 233647312.0 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){}

  • bool2

     
    if(obj['d']){}