Merge pull request #2 from EmilianoAngel/solutions

#26 - Dart

Author: EmilianoAngel

Roadmap/26 - SOLID SRP/dart/EmilianoAngel.dart

@@ -1 +1,150 @@
-// test
+// Incorrecto
+// class User {
+//   String name;
+//   String email;
+
+//   User(this.name, this.email);
+
+//   void saveToDatabase(String name, String email) {
+//     print('User $name with email $email saved to database.');
+//   }
+
+//   void sendWelcomeEmail(String email) {
+//     print('Welcome email sent to $email');
+//   }
+
+// }
+
+// Corecto
+
+class User {
+  String name;
+  String email;
+
+  User(this.name, this.email);
+}
+
+class UserSeervice {
+  void saveToDatabase(String name, String email) {
+    print('User $name with email $email saved to database.');
+  }
+}
+
+class EmailService {
+  void sendWelcomeEmail(String email) {
+    print('Welcome email sent to $email');
+  }
+}
+
+// Ejercicio de biblioteca
+
+// Icorrecto
+// class Biblioteca {
+//   List<Map<String, dynamic>> books = [];
+//   List<Map<String, dynamic>> users = [];
+//   List<String> loans = [];
+
+//   void addBook(String title, String author, int copies) {
+//     books.add({'title': title, 'author': author, 'copies': copies});
+//     print('Book "$title" added to the library.');
+//   }
+
+//   void addUser(String name, String userId, int email) {
+//     users.add({'name': name, 'userId': userId, 'email': email});
+//     print('User "$userId" added to the database.');
+//   }
+
+//   void loanBook(String userId, String bookTitle) {
+//     var user = users.firstWhere((u) => u['userId'] == userId, orElse: () => {});
+//     var book = books.firstWhere((b) => b['title'] == bookTitle, orElse: () => {});
+
+//     if (user.isEmpty) {
+//       print('User not found.');
+//       return;
+//     }
+
+//     if (book.isEmpty || book['copies'] <= 0) {
+//       print('Book not available.');
+//       return;
+//     }
+
+//     book['copies'] -= 1;
+//     loans.add('User $userId loaned "$bookTitle"');
+//     print('Book "$bookTitle" loaned to user $userId.');
+//   }
+
+//   void returnBook(String userId, String bookTitle) {
+//     var book = books.firstWhere((b) => b['title'] == bookTitle, orElse: () => {});
+
+//     if (book.isEmpty) {
+//       print('Book not found in the library.');
+//       return;
+//     }
+
+//     book['copies'] += 1;
+//     loans.remove('User $userId loaned "$bookTitle"');
+//     print('Book "$bookTitle" returned by user $userId.');
+//   }
+// }
+
+// Correcto 
+class Book {
+  String title;
+  String author;
+  int copies;
+
+  Book(this.title, this.author, this.copies);
+}
+
+class LibraryUser {
+  String name;
+  String userId;
+  String email;
+
+  LibraryUser(this.name, this.userId, this.email);
+}
+
+class Loan {
+  List<Map<String, dynamic>> loans = [];
+
+  void loanBook(LibraryUser user, Book book) {
+    if (book.copies <= 0) {
+      print('Book not available.');
+      return;
+    }
+
+    book.copies -= 1;
+    loans.add({'userId': user.userId, 'bookTitle': book.title});
+    print('Book "${book.title}" loaned to user ${user.userId}.');
+  }
+
+  void returnBook(LibraryUser user, Book book) {
+    book.copies += 1;
+    loans.removeWhere((loan) => loan['userId'] == user.userId && loan['bookTitle'] == book.title);
+    print('Book "${book.title}" returned by user ${user.userId}.');
+  }
+}
+
+class Library {
+  List<Book> books = [];
+  List<LibraryUser> users = [];
+  Loan loanService = Loan();
+
+  void addBook(Book book) {
+    books.add(book);
+    print('Book "$book.title" added to the library.');
+  }
+
+  void addUser(LibraryUser user) {
+    users.add(user);
+    print('User "${user.userId}" added to the database.');
+  }
+
+  loanBook(LibraryUser user, Book book) {
+    loanService.loanBook(user, book);
+  }
+
+  returnBook(LibraryUser user, Book book) {
+    loanService.returnBook(user, book);
+  }
+}