Can you make an object 'callable'?

Question

Is it possible to make an object callable by implementing either call or apply on it, or in some other way? E.g.:

var obj = {}; obj.call = function (context, arg1, arg2, ...) {     ... };  ...  obj (a, b); 

Answer 1

No, but you can add properties onto a function, e.g.

function foo(){} foo.myProperty = "whatever"; 

EDIT: to "make" an object callable, you'll still have to do the above, but it might look something like:

// Augments func with object's properties function makeCallable(object, func){     for(var prop in object){         if(object.hasOwnProperty(prop)){             func[prop] = object[prop];         }     } } 

And then you'd just use the "func" function instead of the object. Really all this method does is copy properties between two objects, but...it might help you.

Answer 2

ES6 has better solution for this now. If you create your objects in a different way (using class, extending 'Function' type), you can have a callable instance of it.

See also: How to extend Function with ES6 classes?