Run results for: instanceof vs typeof vs fast typeof object2 - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.45 Safari/537.36

Browser: Chrome 96

Operating system: Linux

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
instanceof	5006375.0 Ops/sec
typeof	14291533.0 Ops/sec
typeof object charAt	13409224.0 Ops/sec
typeof object [0]	13275491.0 Ops/sec
typeof object startsWith	13227580.0 Ops/sec

Script Preparation code:

var obj = {a:2};

Tests:

instanceof
obj instanceof Object
typeof
typeof obj === 'object'
typeof object charAt
(typeof obj).charAt(0) === 'o'
typeof object [0]
(typeof obj)[0] === 'o'
typeof object startsWith
(typeof obj).startsWith('o')