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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=534732" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:128.0) Gecko/20100101 Firefox/128.0
Browser:
Firefox 128
Operating system:
Windows
Device Platform:
Desktop
Date tested:
2 years ago
string type
1172.8M/s
property
1118.5M/s
constructor comparison
1084.1M/s
string type + undefined
1071.4M/s
instanceof
116.4M/s
View exact numbers
Test name
Executions per second
✓
string type
1,172,807,296 Ops/sec
property
1,118,489,344 Ops/sec
constructor comparison
1,084,136,064 Ops/sec
string type + undefined
1,071,413,568 Ops/sec
instanceof
116,414,024 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