Run results for: isFunction vs typeof function 5

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:49.0) Gecko/20100101 Firefox/49.0

Browser: Firefox 49

Operating system: Mac OS X 10.14

Device Platform: Desktop

Date tested: 5 years ago

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;