Benchmark: instanceof vs typeof vs fast typeof object2 - MeasureThat.net

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')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
instanceof
typeof
typeof object charAt
typeof object [0]
typeof object startsWith

Fastest: N/A

Slowest: N/A

ⓘ Get performance results from real users on your website with Request Metrics.

Website Performance Monitoring by Request Metrics

Latest run results:

Run details: (Test run date: 2 years ago)

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

Browser/OS: Chrome 96 on Linux

View result in a separate tab

Test name	Executions per second
instanceof	5006375.0 Ops/sec
typeof	14291530.0 Ops/sec
typeof object charAt	13409220.0 Ops/sec
typeof object [0]	13275490.0 Ops/sec
typeof object startsWith	13227580.0 Ops/sec