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Run results for:
typeof vs instanceof vs constructor
Comparing typeof vs instanceof vs .constructor property
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=574388" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (iPhone; CPU iPhone OS 18_1_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.1.1 Mobile/15E148 Safari/604.1
Browser:
Mobile Safari 18
Operating system:
iOS 18.1.1
Device Platform:
Mobile
Date tested:
one year ago
constructor check
1.3M/s
instanceof check
1.3M/s
typeof check
1.3M/s
View exact numbers
Test name
Executions per second
✓
constructor check
1,291,636 Ops/sec
instanceof check
1,291,316 Ops/sec
typeof check
1,264,261 Ops/sec
Script Preparation code:
function Ticket(id) { this._id = id; } var testTicket = new Ticket(1); var count = 1000;
Tests:
typeof check
for (var i = 0; i < count; i += 1) { if (typeof testTicket === 'object') { continue; } }
instanceof check
for (var i = 0; i < count; i += 1) { if (testTicket instanceof Ticket) { continue; } }
constructor check
for (var i = 0; i < count; i += 1) { if (testTicket.constructor.name === 'Ticket') { continue; } }