javascript 에서 맵 사용 하기

mis.comm.js.Map = function() {
    this.elements = new Array();
 
    //  MAP    
    this.size = function() {
        return this.elements.length;
    }
 
    //  MAP    
    this.isEmpty = function() {
        return (this.elements.length < 1);
    }
 
    //  MAP    
    this.clear = function() {
        this.elements = new Array();
    }
 
    // MAP     （key, value)
    this.put = function(_key, _value) {
        this.elements.push( {
            key : _key,
            value : _value
        });
    }
 
    //    KEY   ，    True，    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;
                }
            }
        } catch (e) {
            bln = false;
        }
        return bln;
    }
 
    //    KEY    VALUE，    NULL
    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 null;
        }
    }
 
    //         （  element.key，element.value  KEY VALUE），    NULL
    this.element = function(_index) {
        if (_index < 0 || _index >= this.elements.length) {
            return null;
        }
        return this.elements[_index];
    }
 
    //  MAP       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;
    }
 
    //  MAP       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;
    }
 
    //  MAP   VALUE   （ARRAY）
    this.values = function() {
        var arr = new Array();
        for (i = 0; i < this.elements.length; i++) {
            arr.push(this.elements[i].value);
        }
        return arr;
    }
 
    //  MAP   KEY   （ARRAY）
    this.keys = function() {
        var arr = new Array();
        for (i = 0; i < this.elements.length; i++) {
            arr.push(this.elements[i].key);
        }
        return arr;
    }
}