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Run results for:
Instanceof vs string comparison vs property checking vs constructor comparison
Measure the performance of instanceOf operator vs comparing a basic string type.
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=608730" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36
Browser:
Chrome 137
Operating system:
Linux
Device Platform:
Desktop
Date tested:
one year ago
property
158.4M/s
string type + undefined
157.3M/s
instanceof
155.9M/s
constructor comparison
149.4M/s
string type
146.4M/s
View exact numbers
Test name
Executions per second
✓
property
158,394,976 Ops/sec
string type + undefined
157,305,888 Ops/sec
instanceof
155,916,976 Ops/sec
constructor comparison
149,393,776 Ops/sec
string type
146,449,552 Ops/sec
HTML Preparation code:
<script> class TestClass { constructor() { this.a = 2; this.t = 'mesh'; } } </script>
Script Preparation code:
var obj = new TestClass();
Tests:
instanceof
obj instanceof TestClass;
string type
obj.t === 'mesh'
string type + undefined
obj.t !== undefined
property
obj.a !== undefined
constructor comparison
obj.constructor === TestClass