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Merge pull request #8920 from EmilianoAngel/main
#26 - Dart
2 parents 4c3a6a5 + 1bdd3ed commit 757051a

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

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

‎Roadmap/27 - SOLID OCP/dart/EmilianoAngel.dart‎

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// Incorrecto
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// class Form {
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// void drawSquare() {
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// print('Dibujar un cuadrado');
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// }
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// void drawCircle() {
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// print('Dibujar un círculo');
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// }
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// }
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// Correcto
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abstract class Form {
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void draw();
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}
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class Square implements Form {
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@override
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void draw() {
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print('Dibujar un cuadrado');
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}
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}
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class Circle implements Form {
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@override
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void draw() {
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print('Dibujar un círculo');
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}
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}
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class Triangle implements Form {
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@override
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void draw() {
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print('Dibujar un triángulo');
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}
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}
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// Ejercicio de calculadora
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abstract class Operation {
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double execute(double a, double b) {
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return 0;
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}
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}
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class Addition implements Operation {
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@override
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double execute(double a, double b) {
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return a + b;
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}
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}
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class Subtraction implements Operation {
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@override
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double execute(double a, double b) {
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return a - b;
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}
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}
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class Multiplication implements Operation {
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@override
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double execute(double a, double b) {
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return a * b;
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}
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}
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class Division implements Operation {
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@override
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double execute(double a, double b) {
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if (b == 0) {
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throw Exception('Division by zero is not allowed.');
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}
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return a / b;
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}
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}
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class Power implements Operation {
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@override
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double execute(double a, double b) {
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double result = 1;
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for(int i = 0; i < b; i++) {
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result *= a;
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}
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return result;
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}
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}
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class Calculator {
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final Map<String, dynamic> _operations = {};
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void addOperation(String name, Operation operation) {
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_operations[name] = operation;
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}
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double calculate(String name, double a, double b) {
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final operation = _operations[name];
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if (operation == null) {
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throw ArgumentError('Operation $name not supported.');
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}
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return operation.execute(a,b);
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}
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}
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void main () {
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Calculator calculator = Calculator();
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calculator.addOperation('addition', Addition());
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calculator.addOperation('substraction', Subtraction());
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calculator.addOperation('multiplication', Multiplication());
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calculator.addOperation('division', Division());
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calculator.addOperation('power', Power());
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print(calculator.calculate('addition', 5, 3));
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print(calculator.calculate('substraction', 6, 3));
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print(calculator.calculate('multiplication', 5, 2));
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print(calculator.calculate('division', 12, 6));
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print(calculator.calculate('power', 2, 3));
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}

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