package com.exanimo.utils
{
	/**
	 *
	 * Functions to be used with the Array.filter method.
	 *	
	 * @see Array#filter()
	 *
	 * @author     Matthew Tretter
	 * @version    2008.07.30
	 *
	 */
	public class ArrayFilters
	{
		/**
		 *
		 *	
		 */
		public function ArrayFilters()
		{
			throw new Error('ArrayFilters contains static utility methods and cannot be instantialized.');
		}


		/**
		 *
		 *	Determines whether an item is unique (i.e. exists in the Array more
		 *	only once.) When this function is passed to Array.filter, the result
		 *	is an array with all duplicate items removed.
		 *	
		 *	@param item
		 *		The item to check.
		 *	@param index
		 *		The position of the item in the Array.
		 *	@param array
		 *		The Array that contains the item.
		 *	@returns Boolean
		 *		True if the item exists in the Array only once; otherwise false.
		 *
		 */
		public static function UNIQUE(item:*, index:int, array:Array):Boolean
		{
			return index == array.lastIndexOf(item);
		}




	}
}