Run results for: isFunction vs typeof function 6

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser: Chrome 120

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

typeof function

5.1M/s

instanceof

3.1M/s

wrapped typeof function (like optimized _.isFunction)

2.9M/s

isFunction

2.7M/s

View exact numbers

Test name	Executions per second
✓ typeof function	5,068,784 Ops/sec
instanceof	3,083,453 Ops/sec
wrapped typeof function (like optimized _.isFunction)	2,904,938 Ops/sec
isFunction	2,660,007 Ops/sec

HTML Preparation code:

<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.core.js"></script>

Script Preparation code:

window.sample = function () {};
window.$isFunction = function (v) { return typeof v === 'function'; };

Tests:

isFunction
var isfunc = _.isFunction(sample);
typeof function
var isfunc = typeof sample === 'function';
instanceof
var isfunc = sample instanceof Function;
wrapped typeof function (like optimized _.isFunction)
var isfunc = $isFunction(sample);