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Run results for:
undefined vs. typeof vs. in vs. hasOwnProperty
Object lookup performance
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=494225" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:120.0) Gecko/20100101 Firefox/120.0
Browser:
Firefox 120
Operating system:
Mac OS X 10.15
Device Platform:
Desktop
Date tested:
2 years ago
hasOwnProperty
832.0M/s
typeof
831.4M/s
bool
830.5M/s
in
830.5M/s
undefined
829.0M/s
View exact numbers
Test name
Executions per second
✓
hasOwnProperty
831,962,688 Ops/sec
typeof
831,369,408 Ops/sec
bool
830,474,688 Ops/sec
in
830,453,120 Ops/sec
undefined
829,036,352 Ops/sec
Script Preparation code:
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;