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extending ecmascript 5 array methods

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  1. (function(){
  2. 	var p, ap= Array.prototype,
  3. 	p2={
  4. 		filter: function(fun, scope){
  5. 			var L= this.length, A= [], i= 0, val;
  6. 			if(typeof fun== 'function'){
  7. 				while(i< L){
  8. 					if(i in this){
  9. 						val= this[i];
  10. 						if(fun.call(scope, val, i, this)){
  11. 							A[A.length]= val;
  12. 						}
  13. 					}
  14. 					++i;
  15. 				}
  16. 			}
  17. 			return A;
  18. 		},
  19. 		forEach: function(fun, scope){
  20. 			var L= this.length, i= 0;
  21. 			if(typeof fun== 'function'){
  22. 				while(i< L){
  23. 					if(i in this){
  24. 						fun.call(scope, this[i], i, this);
  25. 					}
  26. 					++i;
  27. 				}
  28. 			}
  29. 			return this;
  30. 		},
  31. 		every: function(fun, scope){
  32. 			var L= this.length, i= 0;
  33. 			if(typeof fun== 'function'){
  34. 				while(i<L){
  35. 					if(i in this && !fun.call(scope, this[i], i, this)) return false;
  36. 					++i;
  37. 				}
  38. 				return true;
  39. 			}
  40. 			return null;
  41. 		},
  42. 		indexOf: function(what, i){
  43. 			i= i || 0;
  44. 			var L= this.length;
  45. 			while(i< L){
  46. 				if(this[i]=== what) return i;
  47. 				++i;
  48. 			}
  49. 			return -1;
  50. 		},
  51. 		lastIndexOf: function(what, i){
  52. 			var L= this.length;
  53. 			i= i || L-1;
  54. 			if(isNaN(i) || i>= L) i= L-1;
  55. 			else if(i< 0) i += L;
  56. 			while(i> -1){
  57. 				if(this[i]=== what) return i;
  58. 				--i;
  59. 			}
  60. 			return -1;
  61. 		},
  62. 		map: function(fun, scope){
  63. 			var L= this.length, A= Array(this.length), i= 0, val;
  64. 			if(typeof fun== 'function'){
  65. 				while(i< L){
  66. 					if(i in this){
  67. 						A[i]= fun.call(scope, this[i], i, this);
  68. 					}
  69. 					++i;
  70. 				}
  71. 				return A;
  72. 			}
  73. 		},
  74. 		some: function(fun, scope){
  75. 			var i= 0, L= this.length;
  76. 			if(typeof fun== 'function'){
  77. 				while(i<L){
  78. 					if(i in this && fun.call(scope, this[i], i, this)) return true;
  79. 					++i;
  80. 				}
  81. 				return false;
  82. 			}
  83. 		}
  84. 	}
  85. 	for(p in p2){
  86. 		if(!ap[p]) ap[p]= p2[p];
  87. 	}
  88. })();

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