MeasureThat.net

Run results for: undefined vs. typeof vs. in vs. hasOwnProperty 2

Object lookup performance

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Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.62 Safari/537.36
Chrome 67
Mac OS X 10.13.4
Desktop
6 years ago
Test name Executions per second
in 11957728.0 Ops/sec
hasOwnProperty 11466849.0 Ops/sec
Script Preparation code:
AخA
 
var obj = { a: 1, b: 2, c: 3, d: 4, e: 5 };
Tests:

  • in

     
    'd' in obj;

  • hasOwnProperty

     
    obj.hasOwnProperty( 'd' );