On Jan 8, 2008 11:44 PM, Mislav Marohnić <[EMAIL PROTECTED]> wrote:
> Nicolás shouldn't have answered your question because this group is for
> discussion of development for Prototype core library.
>
> You can ask general questions on "rails-spinoffs" group or, if it's only
> related to Core JavaScript, on any other JavaScript mailing list.
>
> Thanks!
>
>
>
> On Jan 9, 2008 2:36 AM, Nicolás Sanguinetti <[EMAIL PROTECTED]> wrote:
> >
> >
> > On Jan 8, 2008 11:20 PM, Simon Thomas <[EMAIL PROTECTED]> wrote:
> > >
> > > Can anyone explain the difference in the folllowing and when and why
> > > to use each of the methods.
> > > (Or knows a better place to ask this question)
> > >
> > > 1)
> > > var myVar = function(args){
> > > // inner functions and vars
> > > };
> >
> > This makes myVar point to that function, so you can later call
> > myVar(args), it's a normal function declaration and it's almost
> > equivalent to
> > doing function myVar(args) { ... }. As functions are first-order
> > citizens in JavaScript, you can just assign them to a variable.
> >
> >
> > > 2)
> > > var myVar = (function(args){
> > > // inner functions and vars
> > > });
> >
> > This is exactly the same as (1). As any object in JS, a function can
> > be wrapped in parenthesis with no consequence.
> >
> >
> > > 3)
> > > var myVar = (function(args){
> > > return {
> > > //inner functions and vars
> > > }
> > > })();
> >
> > This will declare an anonymous function that receives "args" (only one
> > argument), and *immediately after declaring it* it will call it
> > passing *no arguments*. So if you depend on args inside the function
> > that will error out. Since it executes it, myVar will point to
> > whatever the function returns.
> >
> > This technique was called "The Module Pattern" by Douglas Crockford,
> > and has been described throughly in the interweb:
> > - http://yuiblog.com/blog/2007/06/12/module-pattern/
> > - http://wait-till-i.com/2007/07/24/show-love-to-the-module-pattern/
> > -
> http://nefariousdesigns.co.uk/archive/2007/08/javascript-module-pattern-variations/
> >
> > Best,
> > -Nicolas
> >
> >
> >
> >
> > > >
> > >
> > > >
> >
>
Oops, hadn't noticed this was in Proto-core. Sorry, I never notice if
a thread is in core or spinoffs :-\
-N
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