find

function(options) {
    //console.log(this.items);
    var result = [];
    if (!options || (!isNumber(options) && !isObject(options))) {
        throw new Error('You must provide a valid id or options.');
    }

    if (isNumber(options)) {
        result = this.items.filter(function(item) {
            return item.id == options;
        });

        if (result.length > 0) {
            return result[0];
        } else {
            return null;
        }

    } else {
        var isFound = true;
        result = this.items.filter(function(item) {
            //item.id = item._id;
            //item.genre = item._genre;
            //item.name = item._name;
            for (var prop in options) {
                if (options[prop].toString().toLowerCase() != item[prop].toString().toLowerCase()) {
                    isFound = false;
                    break;
                }
            }

            if (isFound) {
                return item;
            }
        });
    }

    return result;
}