Run results for: isFunction vs typeof function 5

Run details:

User agent: Mozilla/5.0 (Linux; Android 9; SAMSUNG SM-G965F) AppleWebKit/537.36 (KHTML, like Gecko) SamsungBrowser/10.1 Chrome/71.0.3578.99 Mobile Safari/537.36

Browser: Chrome Mobile 71

Operating system: Android

Device Platform: Mobile

Date tested: 4 years ago

Test name	Executions per second
isFunction	1584948.0 Ops/sec
typeof function	442691000.0 Ops/sec
instanceof	1817805.0 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>

Tests:

isFunction
function onClose () { console.log('hey') } var isfunc = _.isFunction(onClose);
typeof function
function onClose () { console.log('hey') } var isfunc = typeof onClose === 'function';
instanceof
function onClose () { console.log('hey') } var isfunc = onClose instanceof Function;

Run results for: isFunction vs typeof function 5

isFunction vs typeof function

isFunction

typeof function

instanceof