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Run results for:
typeof vs instanceof vs constructor
Comparing typeof vs instanceof vs .constructor property
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Run details:
User agent:
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:136.0) Gecko/20100101 Firefox/136.0
Browser:
Firefox 136
Operating system:
Ubuntu
Device Platform:
Desktop
Date tested:
9 months ago
Test name
Executions per second
typeof check
963245.4 Ops/sec
instanceof check
85244.5 Ops/sec
constructor check
877950.4 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; } }