_javascript Techniques for implementing Map function code sharing in JavaScript

/*   * Map object, implement map function    *   * interface:   * size ()      get the number of map elements &
nbsp  * IsEmpty ()     determine if map is empty    * clear ()      Delete all elements of map    * Put (key, value)    Add the element (key, value)     * remove (key) to the map     Delete the element of the specified key. Returns true successfully, Failure returns false   * get (key)     Gets the element value value of the specified key, failure returns null   * Element (index)    gets the element of the specified index (using Element.key,element.value to get key and value), Failure returns null   * ContainsKey (key)   Determines whether the map contains elements of the specified key    * containsvalue (value) to determine if the map contains elements of the specified value    * values ()    
Gets an array of all the value in the map    * keys ()      gets an array of all key in the map (array)    *   * example:   * var map = new map ();   *   * map.put ("Key", "value");   * var val = Map.get ("key")    * ......   *   */   FUnction Map () {       this.elements = new Array ();               //Get the number of map elements        this.size = function () {            return this.elements.length;     
  }              //To determine if map is empty        this.isempty = function () {            Return (This.elements.length < 1);       }               //Delete map all elements        this.clear = function () {            this.elements = new Array ();        }              //adds elements to the map (key, value)         this.put = function (_key, _value) {            this.elements.push ({                key: _key,                value: _value          &nbsp);        }              //Deletes the element of the specified key. Successfully returns TRUE, Failure returns false       this.remove = function (_key) {            var bln = false;            try{               for (i = 0; i < This.elements.length; i++) {                    if (This.elements[i].key = = _key) {           
            this.elements.splice (i, 1);                        return true;                    }               }           &nbsp} catch (e) {                bln = false;            }           return bln;        }              //Gets the element value of the specified key, Failed to return to NULL&NBsp;      this.get = function (_key) {            try{               for (i = 0; i < This.elements.length; i++) {                    if (This.elements[i].key = = _key) {                        return this.elements[i].value;                    }                }         &NBSP;&NBSP;&NBSP} catch (e) {                return null;   &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;}&NBSP;&NBSp     }              // Gets the element of the specified index (using Element.key,element.value to get the key and value), and the failure returns null       this.element = function (_index) {           if (_index < 0 | | _index >= This.elements.length) {                return null;           }            return this.elements[_index];       }               //Determine if the map contains elements of the specified key         This.containskey = function (_key) {           varbln = false;            try{           &Nbsp;    for (i = 0; i < this.elements.length i++) {        
           if (This.elements[i].key = = _key) {                        bln = true;                    }               }           &nbsp} catch (e) {                bln = false;            }           return bln;        }              //Determines whether the map contains elements of the specified value & NBsp;      this.containsvalue = function (_value) {        
   var bln = false;           try{               for (i = 0; i < this.elements.length; i++) {                    if (This.elements[i].value = = _value) {                        bln = true;                    }                }           } catch (e) {               bln = False;           }            return bln;       }               //gets an array of all the value in the map (array)        this.values = function () {           var arr = new Array ();            for (i = 0; i < this.elements.length i++) {     
          arr.push (This.elements[i].value);           }            return arr;       }               //gets the array (array)        this.keys = function () {     of all key keys in the map  &Nbsp;     var arr = new Array ();            for (i = 0; i < this.elements.length i++) {                arr.push (this.elements[i].key);            }           return arr;        }  }