playing with javascript objects and functions, discovered this (probably common)

Question

ok, I was experimenting (getting straight in my head) all this object oriented like stuff javascript can do, and Im simulating inheritance with functions, adding functions to functions (too cool!) and I had a AHA! moment.

var myArray = [function(){console.log("im in an array!");}, 2, "fly feet!"];
myArray[0]();

Of course, now that Ive done it, Ill find its a common thing and useful for somesuch thing... BUT I DISCOVERED IT!!!

Anyone care to share their AHA! moments?

Answer 1

Check out http://stackoverflow.com/questions/61088/hidden-features-of-javascript

Answer 2

When I understood the answer to this question:

How exactly does the JavaScript expression [1 [{}]] parse?

Your AHA moment is an example of first-class functions.

Answer 3

I don't think I had an AHA moment. After learning that everything most things in JavaScript are objects, I realized that something like this is possible:

console.log("I'm not wearing pants".replace('not ', ''))
// Produces: "I'm wearing pants"

As is this:

foo = function(operation) {
  operation();
}

pants = function() {
  console.log("I'm not wearing pants!!");
}

foo(pants); // Produces console output of "I'm not wearing pants!!"

Answer 4

Since functions are first-class objects in JavaScript, you can use them anywhere you would use an object, that includes storing them in an array or even doing things like returning a function from another function.

function one() {
    alert("one");
    function two() {
        alert("two");
    }
    return two;
}

one()();