JS HashMap Example detailed _javascript skills

The

HashMap is a very common, widely used type of data. This article through the example code to introduce the relevant knowledge of JS HashMap, the specific code content as follows:

 /** * Map object, realize map function * Interface: * Size () Get the number of map elements * IsEmpty () to determine whether the map is empty * Clear () Delete all elements of the map * put (key, value) to add to the map The element (key, value) * Remove (key) deletes the element of the specified key, returns true successfully, fails returns false * GET (key) gets the element value value of the specified key, and the failure returns NULL * ELEMENT (index) gets the specified index Element (using Element.key,element.value to get key and value), the failure returns NULL * CONTAINSKEY (key) to determine if the map contains the element * Containsvalue (value) of the specified key  
To determine if the map contains the specified value element * VALUES () gets the array (array) * keys () for all values in the map to obtain an array (array) * Example of all keys in the map: * var map = new map (); 
* * Map.put ("key", "value"); * var val = map.get ("key") * ... * */function HashMap () {/** * store data/this.data = new Object (),/** * Put a key value pair * @para
m {String} key * @param {Object} value */this.put = function (key, value) {This.data[key] = value;}; /** * Get the value of a key * @param {String} key * @return {Object} value/this.get = function (key) {return This.containskey (key)? 
This.data[key]:null;
};
/** * Delete a key value pair * @param {String} key */this.remove = function (key) {delete This.data[key]; /** * Traverse map to perform processingFunctions * * @param {Function} callback function (Key,value,index) {.} */This.each = function (fn) {if (typeof fn!= ' function ') {RE
Turn
var len = this.data.length;
for (Var i=;i<len;i++) {var k = this.data[i]; FN (k,this.data[k],i);}}; /** * Gets the array of key values (Java-like EntrySet ()) * @return The array of key-value objects {Key,value}/This.entrys = function () {var len = this.data.length; va
R Entrys = new Array (len);
for (var i =; i < len; i++) {Entrys[i] = {key:i, value:this.data[i]};
};
/** * To determine if the map is null/this.isempty = function () {return this.data.length = =;
/** * Gets the key value pair quantity * * This.size = function () {return this.data.length;};
/** * Rewrite toString, in JSON format */this.tostring = function () {var s = ' []; 
for (Var i=;i<this.data.length;i++,s+= ', ') {var k = this.data[i]; s = = ' {' id ': ' + + + ', ' value ': ' ' +this.data[k]+ '} ';}
S=s.substring (, s.length-);
if (s!= "") {s+= "]";
return s;
}; 
/** * The value of output value */this.values = function () {var _values= new Array (); for (var key in This.data) {_values.Push (This.data[key]); 
return _values;
}; 
/** * Get the keys */this.keyset = function () {var _keys = new Array (); 
for (var key in This.data) {_keys.push (key); 
return _keys;
}; 
/** * To determine if the map contains the elements of the specified key/This.containskey = function (_key) {return (_key in this.data); 
}; 
/** * Empty map */this.clear = function () {this.data.length =; this.data = new Object (); }

The above is a small set to introduce you to the JS HashMap examples of relevant knowledge, I hope to help you!