Guy,
The function is returning an object, pretty much like { "foo": "bar" }, but
it happens to contain the functions the it wants to expose to the caller.
Gus
On Thu, Jun 25, 2015 at 2:44 PM, Guy Duff <guyd...@gmail.com> wrote:
> Hi, and thanks for having this forum. I am reading the book entitled
> beginning node.js by Basarat Ali Syed
> <http://www.amazon.com/s/ref=dp_byline_sr_book_1?ie=UTF8&field-author=Basarat+Ali+Syed&search-alias=books&text=Basarat+Ali+Syed&sort=relevancerank>.
> There is a code example that I am having a little trouble understanding:
>
> function printableMessage() {
> var message = 'hello';
> function setMessage(newMessage) {
> if(!newMessage) throw new Error('cannot set empty message');
> message = newMessage;
> }
>
> function getMessage() {
> return message;
> }
>
> function printMessage() {
> console.log(message);
> }
>
> return {
> setMessage: setMessage,
> getMessage: getMessage,
> printMessage: printMessage
> };
> }
>
> // Pattern in use
> var awesome1 = printableMessage();
> awesome1.printMessage();
>
> var awesome2 = printableMessage();
> awesome2.setMessage('A new message for you.');
> awesome2.printMessage();
> "
>
> I understand everything except the syntax in the return section. Why is
> the label the same as function name in each case in the return section.
> Why is a return necessary to execute the function at all? This code was
> designed to illustrate the concept of "revealing modules"? I would be very
> grateful if anyone can elaborate on how this example reveals modules. Are
> each of the functions a "module"? If this is so, am I to assume that the
> return function is responsible for revealing them?
>
> It seems like the functions are methods of the printableMessage function?
> Anyway, sorry for asking such a nube question. I really want to understand
> node.js, not just hack into to develop. - Thanks very much.
>
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