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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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<iframe src="https://measurethat.net/Embed?id=525424" 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/17.4.1 Safari/605.1.15
Browser:
Safari 17
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
2 years ago
string type
30.9M/s
constructor comparison
13.6M/s
instanceof
13.4M/s
property
10.7M/s
string type + undefined
10.6M/s
View exact numbers
Test name
Executions per second
✓
string type
30,861,230 Ops/sec
constructor comparison
13,583,914 Ops/sec
instanceof
13,422,323 Ops/sec
property
10,688,938 Ops/sec
string type + undefined
10,642,382 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