task1.js

task1.js

function BookStore() {
	this._last_id = 0;
	this._books = [];
}

var _p = BookStore.prototype;

_p._isValidBook = function(book) {
	if (book === null) {
		return false;
	}

	if (typeof book !== 'object') {
		return false;
	}

	if (book.name === undefined) {
		return false;
	}

	return true;
};

_p._getBookIndexByName = function(name) {
	
	for (var i = 0; i < this._books.length; i++) {

		if (this._books[i].name.toUpperCase() === name.toUpperCase()) {
			return i;
		}

	}

	return false;
};

_p._getBookIndexById = function(id) {
	
	for (var i = 0; i < this._books.length; i++) {

		if (this._books[i].id === id) {
			return i;
		}

	}

	return false;
};

_p._getBookIndexByObject = function(book) {
	return this._getBookIndexByName(book.name)
};

_p._getBookIndex = function(book, allowSearchById, allowSearchByName, allowSearchByObject) {
	var allowSearchById = allowSearchById || true;
	var allowSearchByName = allowSearchByName || true;
	var allowSearchByObject = allowSearchByObject || true;

	if (typeof book === 'number' && allowSearchById) {
		return this._getBookIndexById(book);
	}

	if (typeof book === 'string' && allowSearchByName) {
		return this._getBookIndexByName(book);
	}

	if (typeof book === 'object' && allowSearchByObject) {
		return this._getBookIndexByObject(book);
	}

	return false;
};

_p.add = function() {
	var result = [];
	var book;
	var book_index;

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

		book = arguments[i];

		if (!this._isValidBook(book)) {
			continue;
		}

		book_index = this._getBookIndex(book, false, false, true);

		if (book_index !== false) {
			continue;
		}

		this._last_id++;
		book.id = this._last_id;

		this._books.push(book);
		result.push(book);

	}

	if (result.length == 0) {
		return 0;
	}

	return result;
};

_p.remove = function() {
	var result = [];
	var book_index;

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

		book_index = this._getBookIndex(arguments[i], true, false, true);

		if (book_index === false) {
			continue;
		}

		result.push(this._books[book_index]);
		this._books.splice(book_index, 1);

	}

	return result;
};

_p.find = function() {
	var result = [];
	var book_index;

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

		book_index = this._getBookIndex(arguments[i], true, true, false);

		if (book_index === false) {
			continue;
		}

		result.push(this._books[book_index]);

	}

	return result;
}

_p.all = function() {
	return this._books;
}

var store = new BookStore();

var book1 = {name: 'Pride and Prejudice'};
var book2 = {name: 'A Tale of Two Cities'};
var book3 = {name: 'Treasure Island'};
var book4 = {name: 'Dracula'};


store.add(book1);
store.add('book', false, null);
store.add(book2, book3);
store.add(book4, book1);

store.remove(book1);
store.remove(book2, book3)
store.remove(book4, book1);
store.add(book1, book2, book3, book4);
store.remove(book3.id);
store.remove(book2, 'Treasure Island');

console.log(store.all());