Ambiguous function declaration in Javascript

Question

I am new to Javascript and got confused by how the function declaration works. I made some test on that and got some interesting results:

say();

function sa         


        

Answer 1

Its always good idea calling the function later, even though javascript works like that.

Most of the languages won't work that way, instead do this.

function say(){
    alert("say");
}

say();

or

say = function(){
    alert("say");
}

say();

or

(function(){
    alert("say");
})();