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Run results for:
undefined vs. typeof vs. in vs. operator
Object lookup performance
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=587657" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.3 Safari/605.1.15
Browser:
Safari 18
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
undefined
216754368.0 Ops/sec
typeof
204175264.0 Ops/sec
in
203588512.0 Ops/sec
operator
223116496.0 Ops/sec
bool
222977104.0 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;
operator
obj.d >= 0;
bool
!! obj.d;