Returns a new function that runs the original one with the provided arguments. The resulted callback doesn't require any arguments.

callback.js

// Run `callback` on any function and provide arguments.
// Returns - a callback that takes no arguments and run the original
// function using the arguments provided in the call to `.callback()`
Function.prototype.callback = function() {
    var args = arguments;
    var thisFunc = this;
    return function() {
        return thisFunc.apply(thisFunc, Array.prototype.slice.call(args));
    };
};