Run results for: instanceof vs typeof vs fast typeof object - 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	5192638.5 Ops/sec
typeof	14142666.0 Ops/sec
typeof object charAt	14102080.0 Ops/sec
typeof object slice	236380592.0 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 slice
(typeof {}).slice(0,1) === 'o'