angular.isFunction()

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.4.1/angular.min.js"></script>
<h1>angular.isFunction()</h1>

JavaScript

var func = function () {};

console.log(angular.isFunction(func.bin(this)));  //  true

console.log(angular.isFunction(() => {}));  //  true