Run results for: instanceof vs typeof

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36 OPR/114.0.0.0 (Edition Yx 05)

Browser: Opera 114

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

typeof

12.9M/s

instanceof

7.3M/s

typeof and test attribute

7.0M/s

typeof no function

6.8M/s

View exact numbers

Test name	Executions per second
✓ typeof	12,938,860 Ops/sec
instanceof	7,296,113 Ops/sec
typeof and test attribute	7,010,368 Ops/sec
typeof no function	6,753,977 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