Topic awaiting preservation: Recursive anonymous functions? (Page 1 of 1)

This question sounds a bit obtuse, but how would one create a recursive anonymous function in Javascript?

(function (i) {

	document.writeln(i);



	if(i > 0)

		/* SOMETHING!! */(i - 1);

})(10);

The only thing I can think of is this(i - 1);, however, this refers to the window object in this case.

I know it must be possible, I just can't figure out how.

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Hmm, though it's not *exactly* what I was looking for, I found that I can do the following without needing an anonymous function.

(function self(i) {

	document.writeln(i);



	if(i > 0)

		self(i - 1);

})(10);

For some reason, I was thinking that the function needed to be anonymous in order to call it directly, but that's not the case.

*case closed*

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The 2nd function is not really anonymous
To use this( i-1 ); in the first function I think something like this ;

(new (function ( i )

{

    document.writeln( i );

    if( i>0 )

        this( i-1 );

} ) )( 10 );

[edit] It doesn't work. I also thought to something along :

new (function( j )

{

	var

		i = parseInt( arguments[0] ),

		output = ""



    if( i>0 )

    {

	    output = (function()

	    {

		    document.writeln( i +"<br>" )

			return output+this( i-1 )

		})( i )

	}

	return output



})( 10 )

That is to create an anonymous Object with a(n anonymous) method being called when it is instanciated, but it doesn't work either.

There must be something like that on http://w3future.com/html/stories/

[/edit]





(Edited by poi on 05-17-2005 07:56)

(x=new Function("i","document.writeln(i);if(i > 0){x(i - 1)}"))(10);

document.write("<p>"+x)

(x=function(i){

 document.writeln(i);

  if(i > 0)

  x(i - 1);

})(10);

document.write("<p>"+x)

Also works, but then it doesn't say it's anonymous lol.

(Edited by TwoD on 05-17-2005 08:17)

nice implementatio. Alas I doubt it still can be considered anonymous since the handle of the function is assigned to a variable.

Well, the first function does say it's anonymous, or it's just been given that name.
Anyway, why not assign it to a variable if you're going to use the function more than once instead of forcing it to be anonymous and unassigned.

/TwoD

quote:

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JavaScript: The Definitive Guide (111:1) says:
[...] the Arguments object defines a callee property that refers to the function that is currently being executed. This is useful, for example, to allow unnamed functions to invoke themselves recursively.

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(function(i) {

	document.writeln(i);

	if (i > 0) arguments.callee(i - 1);

})(10);

(Edited by HZR on 05-17-2005 13:07)

Doh! I thought it was just callee... no wonder my first idea didn't work...
Note to self: Always check the reference when something doesn't work as planned!

/TwoD

Yay!

Thanks, HZR.

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