task1.js

// jsbootcamp, task1
// by Sergey Romanov

// simple test function
function ok(got, expect, desc) {
    if (got === expect) {
        console.log('ok --', desc);
    } else {
        console.log("fail\n\tgot:", got, "expected:", expect, '--',  desc);
    }
}

function BookStore() {
    this._counter = 1;
    this._books   = [];
}

var _p = BookStore.prototype;

// _lookup* functions are part of private API, they
// deal with internal representation of an object

// does regex (partial) matching
_p._lookup_lax = function(search_term) {
    var result = [];

    var books = this._books;
    var re = RegExp(search_term, 'i');
    for (var i = 0; i < books.length; i++) {
        if (books[i].title.match(re)) {
            result.push(i);
        }
    }
    return result.length > 0 ? result : null;
}

// does strict matching
_p._lookup_strict = function(search_term) {
    var books = this._books;
    for (var i = 0; i < books.length; i++) {
        if (books[i].title === search_term) {
            return i;
        }
    }
    return null;
}

_p._lookup_by_id = function(id) {
    var books = this._books;
    for (var i = 0; i < books.length; i++) {
        if (books[i].id === id) {
            return i;
        }
    }
    return null;
}

_p._lookup = function(term, type) {
    var result;
    if (typeof(term) === 'number') {
        result = this._lookup_by_id(term);
    } else if (typeof(type) !== 'string' || type !== 'strict') {
        result = this._lookup_lax(term);
    } else {
        result = this._lookup_strict(term);
    }

    if (result === null) {
        return null;
    }

    switch (typeof(result)) {
        case 'number':
            return [this._books[result]];
        case 'object':
            return result.map(function(index) {
                return this._books[index]; 
            }, this);
    }
}

_p.find = function(search_term) {
    if (arguments.length === 0) {
        return [];
    }
    return this._lookup(search_term, 'lax') || [];
}

_p.add = function() {
    var result = [];
    for (var i = 0; i < arguments.length; i++) {
        item = arguments[i];
        if (typeof(item) !== 'object' || this._lookup(item.title, 'strict')) {
            continue;
        }
        item.id = this._counter++
        this._books.push(item);
        result.push(item);
    }

    return result.length ? result : 0;
}

_p.remove = function() {
    var result = [];
    for (var i = 0; i < arguments.length; i++) {
        var term = arguments[i];
        var index = null;
        if (typeof(term) === 'number') {
            index = this._lookup_by_id(term);
        } else if (typeof(term) === 'string') {
            index = this._lookup_strict(term);
        } else if (typeof(term) === 'object') {
            index = this._lookup_strict(term.title);
        }
        if (index === null) {
            continue;
        }
        result.push(this._books[index]);
        this._books.splice(index, 1);
    }
    return result;
}

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

_p.print = function() {
    if (arguments.length === 0) {
        this.all().forEach(function(el) {
            this.print(el);
        }, this);
        return null;
    }
    for (var i = 0; i < arguments.length; i++) {
        item = arguments[i];
        if (item instanceof Array) {
            item.forEach(function(el) {
                this.print(el);
            }, this);
        } else if (typeof(item) === 'object') {
            console.log("Title:", item.title);
        } else {
            continue;
        }
    }
    return null;
}

var store = new BookStore();

var book1 = { title: 'Преступление и наказание' };
var book2 = { title: 'На дне' };
var book3 = { title: 'Обломов' };
var book4 = { title: 'Мы' };
var book5 = { title: "Cat's Cradle" };

ok(store instanceof BookStore, true, 'store object is valid');
ok(store.add(book1).length, 1, 'simple add');
ok(store.add(), 0, 'empty add');
ok(store.add(1, 'foo', book4).length, 1, 'garbage add');
ok(store.add(book1, book2, book3, book4).length, 2, 'multiple add');
ok(store.find('Мы').length, 1, 'lax search [1]');
ok(store.find('на').length, 2, 'lax search [2]');
ok(store.find().length, 0, 'empty search');
ok(store.find(1).length, 1, 'search by id (existing)');
ok(store.find(42).length, 0, 'search by id (missing)');
ok(store.all().length, 4, 'get all');
ok(store.remove(store.find(book3.title)[0].id).length, 1, 'remove by id');
ok(store.all().length, 3, '1 object was removed from store');
ok(store.remove(book1, book2).length, 2, 'remove objects');
ok(store.remove(42).length, 0, 'nop remove');
ok(store.add(book5).length, 1, 'add new book');
ok(store.remove({}, "Hobbit", book5).length, 1, 'mixed remove');
ok(store.all().length, 1, '2 objects were removed from store');
ok(store.remove(book4.title).length, 1, 'remove by title');
ok(store.all().length, 0, 'store is empty');