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Run results for:
Array isArray vs instanceof vs variable.constructor
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=540783" 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/128.0.0.0 Safari/537.36
Browser:
Chrome 128
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
variable.constructor name
4.2M/s
isArray
3.1M/s
variable.constructor
3.0M/s
Instanceof
3.0M/s
View exact numbers
Test name
Executions per second
✓
variable.constructor name
4,236,516 Ops/sec
isArray
3,074,059 Ops/sec
variable.constructor
3,026,343 Ops/sec
Instanceof
2,996,108 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++; }