javascript add prototype method to all functions?

Question

Is there a way to add a method to all javascript functions without using the prototype library?

something along the lines of :

Function.prototype.methodN         


        

Answer 1

Try Object.prototype instead:

Object.prototype.methodName = function(){ 

  return dowhateverto(this) 
};

But also heed the warning that extending native objects is not always a good idea.

Function.prototype can't really be manipulated reliably in Javascript; it isn't a real object, because Function() constructor needs to return a function, not an object. But, you can't treat it like a normal function either. Its behaviour when you try to access its 'properties' may be undefined and vary between browsers. See also this question.

Answer 2

Changing JS built-in objects can give you some surprises.
If you add external libraries or changing the version of one of them, you are never sure that they won't overwrite your extension.

Answer 3

function one(){
    alert(1);
}
function two(){
    alert(2);
}

var myFunctionNames = ["one", "two"];

for(var i=0; i<myFunctionNames.length; i++) {
    // reference the window object, 
    // since the functions 'one' and 'two are in global scope
    Function.prototype[myFunctionNames[i]] = window[myFunctionNames[i]];
}


function foo(){}

foo.two(); // will alert 2

Answer 4

Sure. Functions are objects:

var foo = function() {};

Function.prototype.bar = function() {
  alert("bar");
};

foo.bar();

Will alert "bar"