Comments on: JavaScript Tip: Running code in the dark

By: Saint Jude

Saint Jude — Sun, 15 Jan 2006 11:58:16 +0000

The constructor function version has the edge for me because I have found that the earlier wrapped-in-parens version causes problems with prototype addition declarations in certain Javascript/JScript environments.

Re previous comment:

Gary, I’m finding this to work out quite well, ..so far

new function foo(a) { doo = function(){alert(a)} }(4) doo()

By: Simon

Simon — Fri, 13 Jan 2006 12:17:57 +0000

Getting back to the window scope is straight forward too.
(function() { window.foo = "whee"; var bar = "boo"; })();

alert("outside: " + foo); // foo! but no bar.

–
Simon

By: Tom

Tom — Thu, 12 Jan 2006 16:13:29 +0000

Or use:

new function() {
// do stuff
}

A little cleaner syntax and it can also be used in place of object literals if you want to use arbitrary code. (Explanation: It defines and calls a constructor in place.)

Side comment: Your banner ad is blinking on the left as I type. Very annoying.

By: snook.ca - a collection of tips, tricks and bookmarks in web development

snook.ca - a collection of tips, tricks and bookmarks in web development — Thu, 12 Jan 2006 14:13:28 +0000

Dealing with JavaScript Scope

Over at Ajaxian, they’ve offered up a useful tip for dealing with code that exists in the global namespace and is conflicting with other scripts: move it into its own function. Example: (function() { // do you stuff here! })();…

By: meneame.net

meneame.net — Thu, 12 Jan 2006 11:20:45 +0000

Ajaxian – un blog para programadores AJAX

Ajaxian publica cada dia una media de dos articulos relacionados directamente con cÃ³digo AJAX. Interesante sobre todo su post llamado “10 motivos por los cuales AJAX apareciÃ³ para quedarse”

By: Claus

Claus — Thu, 12 Jan 2006 09:50:34 +0000

ajaxian: You need to do more than just define the function, you need to call it also for the code to actually run. The (…)(); is what it takes to invoke the nameless parameterless function defined.

By: ajaxian

ajaxian — Thu, 12 Jan 2006 07:42:07 +0000

So, is it namespaces or scope?
And what are those fancy parentheses around the function for?
Variable declared inside the function is not visible outside anyway.