MeasureThat.net

Run results for: instanceof vs constructor comparison

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Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/118.0
Firefox 118
Windows
Desktop
one year ago
Test name Executions per second
Instanceof 115332504.0 Ops/sec
Constructor comparison 625072000.0 Ops/sec
HTML Preparation code:
AخA
 
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<script>
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class TestClass {
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    a = 0;
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    b = 0;
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    constructor() {
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        this.a = 2;
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    }
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    get GetA() {
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        return this.a;
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    }
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    GetB() {
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        return this.b;
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    }
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}
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</script>
Script Preparation code:
 
var obj = new TestClass();
Tests:

  • Instanceof

     
    obj instanceof TestClass;

  • Constructor comparison

     
    obj.constructor === TestClass;