Run results for: instanceof vs typeof

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_4_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.4.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 17

Operating system: iOS 17.4.1

Device Platform: Mobile

Date tested: one year ago

instanceof

567.0M/s

typeof

564.6M/s

typeof no function

382.5M/s

typeof and test attribute

330.0M/s

View exact numbers

Test name	Executions per second
✓ instanceof	566,963,200 Ops/sec
typeof	564,571,776 Ops/sec
typeof no function	382,469,280 Ops/sec
typeof and test attribute	329,953,056 Ops/sec

Script Preparation code:

var obj = {a:2};

Tests:

instanceof
obj instanceof Object
typeof
typeof obj === 'object'
typeof no function
typeof obj === 'object' && typeof obj !== 'function'
typeof and test attribute
typeof obj === 'object' && obj.a