JAVA Map, List JQuery Implementation

HashMap = function(){
	this.map = new Array();
};

HashMap.prototype = {
	put : function(key, value){
		this.map[key] = value;
	},

	get : function(key) {
		return this.map[key];
	},
    
    getAll : function () {
	    return this.map;
    },
    
    clear : function () {
    	this.map = new Array();
    },
    
    getKeys : function () {
    	var keys = new Array();
    
        for(var i in this.map){
            keys.push(i);
        }
        
		return keys;
	}
}

function List() {

    this.elements = {};

    this.idx = 0;

    this.length = 0;

}

List.prototype.add = function(element) {

  this.length++;

  this.elements[this.idx++] = element;

};

List.prototype.get = function(idx) {

	return this.elements[idx];

};