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Re: [ydn-javascript] Re: (function() { -- what? why?

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  • dav.glass@yahoo.com
    To add to Thomas post.. This syntax is very handy for making private variables.. like this: (function() { var Dom = YAHOO.util.Dom, Event = YAHOO.util.Event,
    Message 1 of 3 , Aug 1 3:10 PM
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      To add to Thomas' post.. This syntax is very handy for making private variables.. like this:

      (function() {
          var Dom = YAHOO.util.Dom,
                Event = YAHOO.util.Event,
                test = null;

          function one() {
             test = Dom.get('someId');
          }
          function two() {
             var id = test.id;
          }
      })();

      You will notice that Dom, Event and test are scoped to the anonymous function and not the window..

      It helps to keep the global scope less crowded..

      Hope that helps :)
      Dav
       
      Dav Glass
      dav.glass@...
      blog.davglass.com
       
       
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      ----- Original Message ----
      From: tssha <tsha@...>
      To: ydn-javascript@yahoogroups.com
      Sent: Wednesday, August 1, 2007 2:48:47 PM
      Subject: [ydn-javascript] Re: (function() { -- what? why?

      --- In ydn-javascript@ yahoogroups. com, Ian Shafer <ian@...> wrote:
      >
      > Hello,
      >
      > I'm an experienced Java (not Javascript) developer who's starting to
      get
      > into Javascript. I've noticed this code:
      >
      > (function() {
      >
      > starting off classes that extend other classes.
      >
      > For example, take a look at
      > http://developer. yahoo.com/ yui/examples/ dragdrop/ dd-groups. html.
      Look at
      > the definition of
      > YAHOO.example. DDPlayer.
      >
      > Can someone explain what this code does? Thanks,

      (function() {}());

      This is a self-executing, anonymous function. This syntax results in
      the function being executed immediately after definition.

      Regards,
      Thomas


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