AngularJS Built-in helper Functions angular.isFunction
Example
The function angular.isFunction determines and returns true if and only if the value passed to is a reference to a function.
The function returns a reference to the now extended destination object
angular.isFunction(fn)
Examples
var onClick = function(e) {return e};
angular.isFunction(onClick); // true
var someArray = ["pizza", "the", "hut"];
angular.isFunction(someArray ); // false
