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Run results for:
Array isArray vs instanceof vs variable.constructor
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<iframe src="https://measurethat.net/Embed?id=511089" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36
Browser:
Chrome 122
Operating system:
Windows
Device Platform:
Desktop
Date tested:
2 years ago
variable.constructor name
2.5M/s
variable.constructor
1.8M/s
Instanceof
1.7M/s
isArray
1.7M/s
View exact numbers
Test name
Executions per second
✓
variable.constructor name
2,471,510 Ops/sec
variable.constructor
1,764,978 Ops/sec
Instanceof
1,729,346 Ops/sec
isArray
1,720,517 Ops/sec
Script Preparation code:
var test = [1,2,3,4]; var c;
Tests:
Instanceof
if (test instanceof Array) { c++; }
isArray
if (Array.isArray(test)) { c++; }
variable.constructor
if (test.constructor === Array) { c++; }
variable.constructor name
if (test.constructor.name === 'Array') { c++; }