同事写的javascript hashMap

//实现hasnArrayMap

    var hashMap = function(){

        this.items = [];

        this.map = {};

    }

 

    hashMap.prototype.set =  function(key,value){

        var isFindInArray = false ;

        var obj ={key:key, value:value};

        for(var i = 0;i<this.items.length;i++){

            if(this.items[i].key == key) {

                obj.index = i;

                this.items[i] = obj;

                isFindInArray = true;

                break;

            }

        }

        if(!isFindInArray) {

            this.items.push(obj);

            obj.index = this.items.length - 1;

        }

        this.map[key] = value;

    }

 

    hashMap.prototype.get =  function(){

        var isKey = typeof(arguments[0]) === 'string';

        if(isKey) {

            return this.map[arguments[0]];

        } else {

            if(typeof(arguments[0])=='number') {

                var index = parseInt(arguments[0]);

                if(index >= 0 && index < this.items.length) {

                    return this.items[index].value;

                } else {

                    return 'undefined';

                }

            } else {

                return 'undefined';

            }

        }

    }

 

    hashMap.prototype.remove = function(){

        var isKey = typeof(arguments[0]) === 'string';

        if(isKey) {

            return this._remove(this.map[arguments[0]]);

        } else {

            if(typeof(arguments[0])=='number') {

                var index = parseInt(arguments[0]);

                if(index >= 0 && index < this.items.length) {

                    return this._remove(this.items[index]);

                } else {

                    return 'array over flow';

                }

            } else {

                return 'wrong arguments';

            }

        }

    }

 

    hashMap.prototype._remove = function(obj){

        if(obj) {

            var index = obj.index,

                key = obj.key;

            this.items.splice(index ,1);

            if(this.map[key])

                delete this.map[key];

        }

        return true;

    }

 

    hashMap.prototype.size = function(){

        return this.items.length;

    }

 

    /*

    var testArray = new SixDegree.hashMap();

    testArray.set('name1' , '1');

    testArray.set('name2' , '2');

    testArray.set('name3' , '3');

 

    console.log(testArray.get('name1'));

    console.log(testArray.get('name2'));

    console.log(testArray.get('name3'));

 

    console.log(testArray.get(0));

    console.log(testArray.get(1));

    console.log(testArray.get(2));

 

    testArray.remove(0);

 

    for(var i=0 , len = testArray.size();i<len ; i++){

        console.log(testArray.get(i));

    }

 

    testArray.remove('name2');

    for(var i=0 , len = testArray.size();i<len ; i++){

        console.log(testArray.get(i));

    }

    */