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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=571449" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36
Browser:
Chrome 131
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
typeof
83.0M/s
in
70.6M/s
bool
70.5M/s
undefined
69.1M/s
hasOwnProperty
40.1M/s
View exact numbers
Test name
Executions per second
✓
typeof
83,024,032 Ops/sec
in
70,609,832 Ops/sec
bool
70,475,624 Ops/sec
undefined
69,124,168 Ops/sec
hasOwnProperty
40,116,332 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;