High order functions for arrays

wrap.as

/*
    Author:
    Daniel Gasienica
    daniel@gasienica.ch
    http://gasi.ch/
    
    
    Originally published on
	http://gasi.ch/blog/functional-actionscript-part-3/
    
    Released under the
    Creative Commons Attribution-Share Alike License
    http://creativecommons.org/licenses/by-sa/3.0/
    
*/
package
{
	/* 
		a beautiful example of a higher order function that takes a function
		as argument and then constructs and returns a new function:
		
		wrapper to make a function's signature conform to that of
		a valid callback which looks like this, e.g. for the filter function
		
			function callback(item:*, index:int, array:Array):Boolean;
		
		http://livedocs.adobe.com/flex/3/langref/Array.html#filter()
	*/
	public function wrap( f : Function ) : Function
	{
		return(
				function( x : *, index : int, array : Array ) : *
				{
					return f( x )
				}
			)
	}
}