Loading ...
Sorry, an error occurred while loading the content.

Re: Unfamiliar Javascript function syntax

Expand Messages
  • Randy Weber
    Dav -- Thanks. It s starting to make sense now. Good reading by crockford, too. Randy ... ability to have private variables :) ... function to this anonymous
    Message 1 of 3 , Jun 3, 2008
    • 0 Attachment
      Dav --

      Thanks. It's starting to make sense now. Good reading by crockford,
      too.

      Randy

      --- In ydn-javascript@yahoogroups.com, Dav Glass <dav.glass@...>
      wrote:
      >
      > Randy --
      >
      >
      > What you are seeing is a common structure in YUI to grant us the
      ability to have private variables :)
      > That was a mouth full, try this:
      >
      > alert(me); //This will be 'undefined';
      >
      > (function() {
      > var me = 'This is me..';
      > alert(me); //This will be 'This is me..'
      >
      > //Now in here we can use var to scope any variable or
      function to this "anonymous function"
      > })(); //The extra ()'s here make the anonymous function execute
      instantly..
      >
      > alert(me); //This will still be 'undefined';
      >
      >
      > More reading on this stuff:
      > http://yuiblog.com/blog/2008/05/24/durable-objects/
      > http://yuiblog.com/blog/2007/06/12/module-pattern/
      > http://www.crockford.com/javascript/private.html
      > http://www.crockford.com/
      >
      > Hope that helps ;)
      > Dav
      >
      > Dav Glass
      > dav.glass@...
      > blog.davglass.com
      >
      >
      >
      >
      > + Windows: n. - The most successful computer virus, ever. +
      > + A computer without a Microsoft operating system is like a dog
      > without bricks tied to its head +
      > + A Microsoft Certified Systems Engineer is to computing what a
      > McDonalds Certified Food Specialist is to fine cuisine +
      >
      >
      > ----- Original Message ----
      > From: Randy Weber <randyweb@...>
      > To: ydn-javascript@yahoogroups.com
      > Sent: Sunday, June 1, 2008 12:17:24 PM
      > Subject: [ydn-javascript] Unfamiliar Javascript function syntax
      >
      > I am a novice self-taught javascript programmer charged with a
      complex
      > project. Though I have plenty of programming experience, I am
      > struggling with some aspects of javascript.
      >
      > I am using YUI (a wonderful find) to save time and help me learn
      > advanced javascript techniques, so pardon me if this isn't the right
      > place to post my question.
      >
      > I see the use of function in a way that is unfamiliar to me:
      > (function() {
      > var Dom = YAHOO.util.Dom,
      > Event = YAHOO.util.Event;
      > })();
      >
      > What is unfamiliar is the preceding parenthesis. It appears to me
      that
      > the function runs before the load event. Is that all there is to the
      > preceding parenthesis or is there more?
      >
      > Can someone tell me or refer me to a link that will tell me what is
      > happening here? When I search the web, I get a myriad of examples of
      > simpler function calls which I already know. This appears to be
      quite
      > different than a function which simply returns a value.
      >
      > Also, what is the purpose of the final ().
      >
      > Thanks in advance
      >
      > Randy Weber
      >
      >
      >
      > ------------------------------------
      >
      > Yahoo! Groups Links
      >
    Your message has been successfully submitted and would be delivered to recipients shortly.