Run results for: typeof vs instanceof vs constructor

Run details:

User agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:109.0) Gecko/20100101 Firefox/115.0

Browser: Firefox 115

Operating system: Windows 8.1

Device Platform: Desktop

Date tested: one year ago

constructor check

195K/s

typeof check

185K/s

instanceof check

15K/s

View exact numbers

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; } }