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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=572740" 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/131.0.0.0 Safari/537.36
Browser:
Chrome 131
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
isArray
16.5M/s
Instanceof
16.1M/s
variable.constructor
16.1M/s
variable.constructor name
14.7M/s
View exact numbers
Test name
Executions per second
✓
isArray
16,457,888 Ops/sec
Instanceof
16,120,448 Ops/sec
variable.constructor
16,079,543 Ops/sec
variable.constructor name
14,659,543 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++; }