function Map() {
this.elements = new Array();

//Gets the number of MAP elements
this.size = function() {
return this.elements.length;
};

//Determines if the MAP is empty
this.isEmpty = function() {
return (this.elements.length < 1);
};

//Delete all elements of the MAP
this.clear = function() {
this.elements = new Array();
};

//Add an element (key, value) to the MAP
this.put = function(_key, _value) {
this.elements.push( {
key : _key,
value : _value
});
};

//Deletes the element that specifies the KEY, returns True on success, False on failure
this.removeByKey = 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;
}
}
} catch (e) {
bln = false;
}
return bln;
};

//Deletes the element with the specified VALUE, returns True on success, False on failure
this.removeByValue = function(_value) {//removeByValueAndKey
var bln = false;
try {
for (i = 0; i < this.elements.length; i++) {
if (this.elements[i].value == _value) {
this.elements.splice(i, 1);
return true;
}
}
} catch (e) {
bln = false;
}
return bln;
};

//Deletes the element with the specified VALUE, returns True on success, False on failure
this.removeByValueAndKey = function(_key,_value) {
var bln = false;
try {
for (i = 0; i < this.elements.length; i++) {
if (this.elements[i].value == _value && this.elements[i].key == _key) {
this.elements.splice(i, 1);
return true;
}
}
} catch (e) {
bln = false;
}
return bln;
};

//Gets the element VALUE of the specified KEY. NULL is returned
this.get = function(_key) {
try {
for (i = 0; i < this.elements.length; i++) {
if (this.elements[i].key == _key) {
return this.elements[i].value;
}
}
} catch (e) {
return false;
}
return false;
};

//Gets the element of the specified index (element.key, element.value gets key and value), fails to return NULL
this.element = function(_index) {
if (_index < 0 || _index >= this.elements.length) {
return null;
}
return this.elements[_index];
};

//Determines whether the MAP contains an element with the specified KEY
this.containsKey = function(_key) {
var bln = false;
try {
for (i = 0; i < this.elements.length; i++) {
if (this.elements[i].key == _key) {
bln = true;
}
}
} catch (e) {
bln = false;
}
return bln;
};

//Determines whether the MAP contains an element with the specified VALUE
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;
};

//Determines whether the MAP contains an element with the specified VALUE
this.containsObj = function(_key,_value) {
var bln = false;
try {
for (i = 0; i < this.elements.length; i++) {
if (this.elements[i].value == _value && this.elements[i].key == _key) {
bln = true;
}
}
} catch (e) {
bln = false;
}
return bln;
};

//Get an ARRAY of all values in the MAP
this.values = function() {
var arr = new Array();
for (i = 0; i < this.elements.length; i++) {
arr.push(this.elements[i].value);
}
return arr;
};

//Get an ARRAY of all values in the MAP
this.valuesByKey = function(_key) {
var arr = new Array();
for (i = 0; i < this.elements.length; i++) {
if (this.elements[i].key == _key) {
arr.push(this.elements[i].value);
}
}
return arr;
};

//Get an ARRAY of all the keys in the MAP
this.keys = function() {
var arr = new Array();
for (i = 0; i < this.elements.length; i++) {
arr.push(this.elements[i].key);
}
return arr;
};

//Get key through value
this.keysByValue = function(_value) {
var arr = new Array();
for (i = 0; i < this.elements.length; i++) {
if(_value == this.elements[i].value){
arr.push(this.elements[i].key);
}
}
return arr;
};

//Get an ARRAY of all the keys in the MAP
this.keysRemoveDuplicate = function() {
var arr = new Array();
for (i = 0; i < this.elements.length; i++) {
var flag = true;
for(var j=0;j<arr.length;j++){
if(arr[j] == this.elements[i].key){
flag = false;
break;
}
}
if(flag){
arr.push(this.elements[i].key);
}
}
return arr;
};
}