#26 - TypeScript

Author: Sac-Corts

Roadmap/26 - SOLID SRP/typescript/Sac-Corts.ts

@@ -0,0 +1,146 @@
+// Invalid way
+class User {
+    name: string;
+    email: string;
+
+    constructor(name: string, email: string) {
+        this.name = name;
+        this.email = email;
+    }
+
+    getUserInfo(): { name: string; email: string } {
+        return {
+            name: this.name,
+            email: this.email
+        };
+    }
+
+    formatUserInfo(): string {
+        return `Name: ${this.name}, Email: ${this.email}`;
+    }
+}
+
+const user = new User('Isaac Morales', '[email protected]');
+console.log(user.formatUserInfo());
+
+// Correct way
+class UserInfo {
+    name: string;
+    email: string;
+
+    constructor(name: string, email: string) {
+        this.name = name;
+        this.email = email;
+    }
+
+    getUserInfo(): { name: string; email: string } {
+        return {
+            name: this.name,
+            email: this.email
+        };
+    }
+}
+
+class FormatUser {
+    static format(user: UserInfo): string {
+        return `Name: ${user.name}, Email: ${user.email}`;
+    }
+}
+
+const newUser = new UserInfo('Isaac Cortés', '[email protected]');
+console.log(FormatUser.format(newUser));
+
+// ** Extra Exercise ** //
+interface Book {
+    title: string;
+    author: string;
+    copies: number;
+}
+
+class BookManager {
+    private books: Book[];
+
+    constructor() {
+        this.books = [];
+    }
+
+    addBook(title: string, author: string, copies: number): void {
+        this.books.push({ title, author, copies });
+    }
+
+    findBook(title: string): Book | undefined {
+        return this.books.find(book => book.title === title);
+    }
+}
+
+interface UserDetails {
+    name: string;
+    id: number;
+    email: string;
+}
+
+class UserManager {
+    private users: UserDetails[];
+
+    constructor() {
+        this.users = [];
+    }
+
+    addUser(name: string, id: number, email: string): void {
+        this.users.push({ name, id, email });
+    }
+
+    findUser(id: number): UserDetails | undefined {
+        return this.users.find(user => user.id === id);
+    }
+}
+
+class LoanManager {
+    private bookManager: BookManager;
+    private userManager: UserManager;
+    private loans: { userId: number; bookTitle: string }[];
+
+    constructor(bookManager: BookManager, userManager: UserManager) {
+        this.bookManager = bookManager;
+        this.userManager = userManager;    
+        this.loans = [];
+    }
+
+    borrowBook(userId: number, bookTitle: string): void {
+        const user = this.userManager.findUser(userId);
+        const book = this.bookManager.findBook(bookTitle);
+
+        if (user && book && book.copies > 0) {
+            book.copies--;
+            this.loans.push({ userId, bookTitle });
+            console.log(`${user.name} borrowed "${book.title}"`);
+        } else {
+            console.log(`Book is unavailable or user not found`);
+        }
+    }
+
+    returnBook(userId: number, bookTitle: string): void {
+        const loanIndex = this.loans.findIndex(
+            loan => loan.userId === userId && loan.bookTitle === bookTitle
+        );
+        const book = this.bookManager.findBook(bookTitle);
+
+        if (loanIndex !== -1 && book) {
+            book.copies++;
+            this.loans.splice(loanIndex, 1);
+            console.log(`"${book.title}" has been returned`);
+        } else {
+            console.log('Loan not found or book not available');
+        }
+    }
+}
+
+const bookManager = new BookManager();
+const userManager = new UserManager();
+const loanManager = new LoanManager(bookManager, userManager);
+
+bookManager.addBook('The Great Gatsby', 'F. Scott Fitzgerald', 5);
+userManager.addUser('Isaac', 1, '[email protected]');
+
+loanManager.borrowBook(1, 'The Great Gatsby');
+loanManager.returnBook(1, 'The Great Gatsby');