編碼實現js的Set

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編碼實現js的Set

 

 1 /** 2 * 3 * Set 4 * 5 * @author: 阿寧 6 * 7 * @date:   2017年5月30日 8 * 9 */10 (function(global){11 12     function Set(){13         this.values = {};14         this.n = 0;15         this.add.apply(this,arguments);16     }17 18     Set.prototype.add = function(){19         for(var i = 0; i < arguments.length; i++){20             var val = arguments[i];21             var key = Set._v2s(val);22             if(!this.values.hasOwnProperty(key)){23                 this.values[key] = val;24                 this.n++;25             }26         }27         return this;28     };29 30     Set.prototype.remove = function(){31         for(var i = 0; i < arguments.length; i++){32             var key = Set._v2s(arguments[i]);33             if(this.values.hasOwnProperty(key)){34                 delete this.values[key];35                 this.n--;36             }37         }38         return this;39     };40 41     Set.prototype.contain = function(val){42         return this.values.hasOwnProperty(Set._v2s(val));43     };44 45     Set.prototype.foreach = function(f,c){46         for(var key in this.values){47             if(this.values.hasOwnProperty(key)){48                 f.call(c,this.values[key]);49             }50         }51         return this;52     };53 54     Set._v2s = function(val){55         switch(val){56             case undefined:return "u";57             case null:return "n";58             case true:return "t";59             case false: return "f";60             default:switch(typeof val){61                 case "number":return "#" + val;62                 case "string":return "\"" + val;63                 default : return "@" + objectId(val);64             }65         }66         function objectId(val){67             var prop = "|**objectid**|";68             if(!val.hasOwnProperty(prop)){69                 val[prop] = Set._v2s.next++;70             }71             return val[prop];72         }73     };74 75     Set._v2s.next = 100;76 77     global.Set = Set;78 79 })(this);

 

編碼實現js的Set