Complex iterator object with helpers

finished-iterator.js

var count = function(obj) {
    var size = 0, key;
    for (key in obj) {
        size++;
    }
    return size;
};

var getItem = function(obj, i) {
    var key, arr = [];
    for (key in obj) {
        arr.push(obj[key]);
    }
    return arr[i];
};

// Our iterator
var iterator = (function() {
    
    var index  = 0,
        // Our data
        data = {
           fname: 'joe',
           lname: 'chapman',
           title: 'developer',
           home: 'UK'
        },
        //data   = ['joe', 'chapman', 'developer', 'UK'],
        length = data.length ? data.length : count(data);
    
    return {

        next: function() {
            if (!this.hasNext()) {
                return null;
            }
            index = index + 1;
            if (data[index] !== undefined) {
                return data[index];
            }
            return getItem(data, index);
        }, 

        hasNext : function() {
            return index < length-1; 
        }, 

        current: function() {
            if (data[index] !== undefined) {
                return data[index];
            }
            return getItem(data, index);
        },
        
        end: function() {
            if (data[length-1] !== undefined) {
                return data[length-1];
            }
            return getItem(data, length-1);
        },

        reset: function() {
            index = 0;
            return this;
        },

        find: function(pos) {
            if (data[pos] !== undefined) {
                return data[pos];
            }
            return getItem(data, pos);
        }

    };

}());

var list = document.getElementById('list'),
    data = [];


// Testing
data.push(iterator.current());

while(iterator.hasNext()) {
    data.push("<li>" + iterator.next() + "</li>");
}

iterator.reset();

var custom = iterator.current() + ' ' + iterator.next() + ' is a ' + iterator.find(2)  + ' living in the ' + iterator.end();

data.push(custom);

list.innerHTML = data.join('');