#26 - javascript

Roadmap/26 - SOLID SRP/javascript/duendeintemporal.js

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+//#26 - Principio SOLID de Responsabilidad Única (Single Responsibility Principle, SRP)
+//Bibliografy: The Web Development Glossary (Jens Oliver Meiert) (Z-Library)
+//GPT
+/*
+ * EJERCICIO:
+ * Explora el "Principio SOLID de Responsabilidad Única (Single Responsibility
+ * Principle, SRP)" y crea un ejemplo simple donde se muestre su funcionamiento
+ * de forma correcta e incorrecta.
+ *
+ * DIFICULTAD EXTRA (opcional):
+ * Desarrolla un sistema de gestión para una biblioteca. El sistema necesita
+ * manejar diferentes aspectos como el registro de libros, la gestión de usuarios
+ * y el procesamiento de préstamos de libros.
+ * Requisitos:
+ * 1. Registrar libros: El sistema debe permitir agregar nuevos libros con
+ * información básica como título, autor y número de copias disponibles.
+ * 2. Registrar usuarios: El sistema debe permitir agregar nuevos usuarios con
+ * información básica como nombre, número de identificación y correo electrónico.
+ * 3. Procesar préstamos de libros: El sistema debe permitir a los usuarios
+ * tomar prestados y devolver libros.
+ * Instrucciones:
+ * 1. Diseña una clase que no cumple el SRP: Crea una clase Library que maneje
+ * los tres aspectos mencionados anteriormente (registro de libros, registro de
+ * usuarios y procesamiento de préstamos).
+ * 2. Refactoriza el código: Separa las responsabilidades en diferentes clases
+ * siguiendo el Principio de Responsabilidad Única.
+ */
+
+
+/*  Single Responsibility Principle
+A computer programming principle that states that every module, class, or
+function should have responsibility over a single part of the functionality
+provided by the software, and that responsibility should be entirely
+encapsulated by the module, class, or function. All its services should be
+narrowly aligned with that responsibility.  */
+
+//Not Following the Single Responsibility Principle (SRP)
+
+let log = console.log;
+
+window.addEventListener('load', ()=>{
+    const body = document.querySelector('body');
+    const title = document.createElement('h1');
+
+    body.style.setProperty('background', '#000');
+    body.style.setProperty('text-align', 'center');
+
+    title.textContent = 'Retosparaprogramadores #26.';
+    title.style.setProperty('font-size', '3.5vmax');
+    title.style.setProperty('color', '#fff');
+    title.style.setProperty('line-height', '100vh');
+
+    body.appendChild(title);
+
+    setTimeout(()=>{
+    alert('Retosparaprogramadores #26. Please open the Browser Developer Tools.');
+    }, 2000);
+    log( 'Retosparaprogramadores #26'); 
+});
+
+class Library {
+    constructor() {
+        this.books = [];
+        this.users = [];
+        this.loans = [];
+    }
+
+    addBook(title, author, copies) {
+        this.books.push({ title, author, copies });
+    }
+
+    registerUser(name, id, email) {
+        this.users.push({ name, id, email });
+    }
+
+    loanBook(userId, bookTitle) {
+        const user = this.users.find(u => u.id === userId);
+        const book = this.books.find(b => b.title === bookTitle);
+
+        if (user && book && book.copies > 0) {
+            this.loans.push({ userId, bookTitle });
+            book.copies--;
+            log(`Book "${bookTitle}" loaned to ${user.name}`);
+        } else {
+            log("Loan failed: User or book not found, or no copies available.");
+        }
+    }
+}
+
+
+const library = new Library();
+library.addBook("Learn Bash the Hard Way", "Ian Miell", 2);
+library.addBook("MATLAB Notes for Professionals", "GoalKicker.com", 4);
+library.registerUser("Royer Rabit", "006", "[email protected]");
+library.loanBook("006", "MATLAB Notes for Professionals"); //Book "MATLAB Notes for Professionals" loaned to Royer Rabit
+
+
+//Extra difiiculty Excercise
+//Following the Single Responsibility Principle (SRP)
+
+class Book {
+    constructor(title, author, copies) {
+        this.title = title;
+        this.author = author;
+        this.copies = copies;
+    }
+}
+
+class User {
+    constructor(name, id, email) {
+        this.name = name;
+        this.id = id;
+        this.email = email;
+    }
+}
+
+class BookManager {
+    constructor() {
+        this.books = [];
+    }
+
+    addBook(title, author, copies) {
+        this.books.push(new Book(title, author, copies));
+    }
+
+    getBooks() {
+        return this.books; 
+    }
+
+    findBook(title) {
+        return this.books.find(b => b.title === title);
+    }
+
+    increaseCopies(bookTitle) {
+        const book = this.findBook(bookTitle);
+        if (book) {
+            book.copies++;
+        }
+    }
+}
+
+function searchBooksByPartialTitle(books, searchTerm) {
+    return books.filter(book => 
+        book.title.toLowerCase().includes(searchTerm.toLowerCase())
+    );
+}
+
+class UserManager {
+    constructor() {
+        this.users = [];
+    }
+
+    registerUser(name, id, email) {
+        this.users.push(new User(name, id, email));
+    }
+
+    findUser(id) {
+        return this.users.find(u => u.id === id);
+    }
+}
+
+class LoanManager {
+    constructor() {
+        this.loans = [];
+        this.nextLoanId = 1;
+    }
+
+    loanBook(user, book) {
+        if (book.copies > 0) {
+            const loanId = this.nextLoanId++;
+            this.loans.push({loanId, userId: user.id, bookTitle: book.title });
+            book.copies--;
+            log(`Book "${book.title}" loaned to ${user.name} with Loan ID: ${loanId}`);
+        } else {
+            log("Loan failed: No copies available.");
+        }
+    }
+
+    returnBook(loanId, bookManager) {
+        const loanIndex = this.loans.findIndex(loan => loan.loanId === loanId);
+
+        if (loanIndex !== -1) {
+            const loan = this.loans[loanIndex];
+            const book = bookManager.findBook(loan.bookTitle);
+            if (book) {
+                book.copies++;
+            }
+
+            // Remove the loan from the loans array
+            this.loans.splice(loanIndex, 1);
+            log(`Book "${loan.bookTitle}" returned with Loan ID: ${loanId}`);
+        } else {
+            log("Return failed: No loan record found for this Loan ID.");
+        }
+    }
+
+    getLoansByPartialBookTitle(searchTerm, userId) {
+        return this.loans.filter(loan => 
+            loan.bookTitle.toLowerCase().includes(searchTerm.toLowerCase()) && loan.userId === userId
+        );
+    }
+}
+
+
+const bookManager = new BookManager();
+const userManager = new UserManager();
+const loanManager = new LoanManager();
+
+bookManager.addBook("300 JavaScript Interview Mastery Questions Dive Deep into JavaScript Theory, Syntax, and APIs, and Interview with Confidence", "Middaugh, Jonathan", 3);
+bookManager.addBook("Javascript Interview Questions and Answers", "Bandal, Pratik", 7);
+bookManager.addBook("100 MOST ASKED JOB READY QUESTIONS ANSWERS IN THE TECH SPACE Here are the most asked questions in PYTHON, SQL, JAVASCRIPT...", "Aimee Mills", 2);
+userManager.registerUser("Niko Zen", "008", "[email protected]");
+
+const searchTerm1 = "JavaScript";
+const searchTerm2 = "Interview Questions";
+
+const searchResults1 = searchBooksByPartialTitle(bookManager.getBooks(), searchTerm1);
+const searchResults2 = searchBooksByPartialTitle(bookManager.getBooks(), searchTerm2);
+
+log(searchResults1); 
+/*
+Book {title: '300 JavaScript Interview Mastery Questions Dive De…, Syntax, and APIs, and Interview with Confidence', author: 'Middaugh, Jonathan', copies: 3}
+Book {title: 'Javascript Interview Questions and Answers', author: 'Bandal, Pratik', copies: 7} 
+Book {title: '100 MOST ASKED JOB READY QUESTIONS ANSWERS IN THE …ost asked questions in PYTHON, SQL, JAVASCRIPT...', author: 'Aimee Mills', copies: 2}
+  */
+log(searchResults2); 
+/* {author:"Bandal, Pratik", copies:7, title:"Javascript Interview Questions and Answers"} */
+
+const user = userManager.findUser("008");
+const bookTitle = searchResults1[2]?.title; 
+const book = bookManager.findBook(bookTitle); 
+
+if (book) {
+    loanManager.loanBook(user, book); // Book "100 MOST ASKED JOB READY QUESTIONS ANSWERS IN THE TECH SPACE Here are the most asked questions in PYTHON, SQL, JAVASCRIPT..." loaned to Niko Zen with Loan ID: 1
+    const loans = loanManager.getLoansByPartialBookTitle(book.title, user.id);
+    loanManager.returnBook(loans[0].loanId, bookManager); // Book "100 MOST ASKED JOB READY QUESTIONS ANSWERS IN THE TECH SPACE Here are the most asked questions in PYTHON, SQL, JAVASCRIPT..." returned with Loan ID: 1
+} else {
+    log("Book not found for loan.");
+}
+