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Run results for:
instanceof vs property in
Measure the performance of instanceOf operator vs property in operator
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=585769" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:135.0) Gecko/20100101 Firefox/135.0
Browser:
Firefox 135
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
property in
1336.0M/s
property undefined
1047.6M/s
instanceof
155.0M/s
View exact numbers
Test name
Executions per second
✓
property in
1,335,977,600 Ops/sec
property undefined
1,047,604,032 Ops/sec
instanceof
154,958,880 Ops/sec
HTML Preparation code:
<script> class TestClass { constructor() { this.a = 2; } } </script>
Script Preparation code:
var obj = new TestClass();
Tests:
instanceof
obj instanceof TestClass;
property undefined
obj.a !== undefined
property in
'a' in obj