Run results for: isFunction vs typeof function

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36

Browser: Chrome 67

Operating system: Mac OS X 10.13.6

Device Platform: Desktop

Date tested: 6 years ago

Test name	Executions per second
isFunction	3935062.0 Ops/sec
typeof function	781218000.0 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';