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Usefull Array utils - SHUFFLE, Random, remove,

/ Published in: ActionScript 3
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Sometimes you need special array functions, not build in AS3. Special ArrayUtils class with some static methods can help us :)

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  1. //The static methods only:
  2.  
  3. //SHUFFLE 
  4. /*
  5. array - array to shufle
  6. startIndex = the start index of the element
  7. endIndex = int, should be array.length-1 to shuffle all
  8. */
  9. public static function shuffle(array:Array, startIndex:int = 0, endIndex:int = 0):Array{ 
  10. 			if(endIndex == 0){
  11. 				endIndex = array.length-1;
  12. 			}
  13. 			for (var i:int = endIndex; i>startIndex; i--) {
  14. 				var randomNumber:int = Math.floor(Math.random()*endIndex)+startIndex;
  15. 				var tmp:* = array[i];
  16. 				array[i] = array[randomNumber];
  17. 				array[randomNumber] = tmp
  18. 			}
  19. 			return array;
  20. 		}
  21.  
  22. //Random element
  23. 	static public function random(array:Array):*{
  24. 			return array.length ? array[Math.floor(Math.random()*array.length)] : null
  25. 		}
  26.  
  27. //removes elemnt from array
  28. 	public static function remove(array:Array, elem:*):Array {
  29. 			return array.filter(function(item:*, index:int, arr:Array):Boolean{ return item != elem })
  30. 		}
  31.  
  32. 		/**
  33. 		*Returns last element of the array
  34. 		**/
  35. 		public static function last(array:Array):*{
  36. 			return array.length ? array[array.length-1] : null;
  37. 		}
  38.  
  39. //previuos element of array
  40. 		static public function previous(array:Array, elem: *):*{
  41. 			return array.indexOf(elem) >=0 ? array[array.indexOf(elem)-1] : null;
  42. 		}
  43.  
  44. //next element of array (array, element)
  45. 		static public function next(array:Array, elem: *):*{
  46. 			return array.indexOf(elem) < array.length-1 ? array[array.indexOf(elem)+1] : null;
  47. 		}

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