Run results for: typeof vs instanceof vs constructor equality check

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:142.0) Gecko/20100101 Firefox/142.0

Browser: Firefox 142

Operating system: Linux

Device Platform: Desktop

Date tested: 11 months ago

constructor check

2.1M/s

instanceof check

139K/s

View exact numbers

Test name	Executions per second
✓ constructor check	2,111,760 Ops/sec
instanceof check	139,153 Ops/sec

Script Preparation code:

function Ticket(id) {
  this._id = id;
}

var testTicket = new Ticket(1);
var count = 1000;

Tests:

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 === Ticket) { continue; } }