الأصناف المجردة في TypeScript: إتقان أنماط التنفيذ الجزئي

            
abstract class Animal {
 abstract makeSound(): string;

 move(): void {
 console.log("Moving...");
 }
}

class Dog extends Animal {
 makeSound(): string {
 return "Woof!";
 }
}

class Cat extends Animal {
 makeSound(): string {
 return "Meow!";
 }
}

//const animal = new Animal(); // Error: Cannot create an instance of an abstract class.

const dog = new Dog();
console.log(dog.makeSound()); // Output: Woof!
dog.move(); // Output: Moving...

const cat = new Cat();
console.log(cat.makeSound()); // Output: Meow!
cat.move(); // Output: Moving...

            

              
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abstract class DataProcessor {
 abstract fetchData(): Promise;
 abstract processData(data: any): any;
 abstract saveData(processedData: any): Promise;

 async run(): Promise {
 const data = await this.fetchData();
 const processedData = this.processData(data);
 await this.saveData(processedData);
 }
}

class APIProcessor extends DataProcessor {
 async fetchData(): Promise {
 // Implementation to fetch data from an API
 console.log("Fetching data from API...");
 return { data: "API Data" }; // Mock data
 }

 processData(data: any): any {
 // Implementation to process data specific to API data
 console.log("Processing API data...");
 return { processed: data.data + " - Processed" }; // Mock processed data
 }

 async saveData(processedData: any): Promise {
 // Implementation to save processed data to a database via API
 console.log("Saving processed API data...");
 console.log(processedData);
 }
}

const apiProcessor = new APIProcessor();
apiProcessor.run();

            

              
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abstract class PaymentProcessor {
 abstract validatePaymentDetails(paymentDetails: any): boolean;
 abstract chargePayment(paymentDetails: any): Promise;
 abstract sendConfirmationEmail(paymentDetails: any): Promise;

 async processPayment(paymentDetails: any): Promise {
 if (!this.validatePaymentDetails(paymentDetails)) {
 console.error("Invalid payment details.");
 return false;
 }

 const chargeSuccessful = await this.chargePayment(paymentDetails);
 if (!chargeSuccessful) {
 console.error("Payment failed.");
 return false;
 }

 await this.sendConfirmationEmail(paymentDetails);
 console.log("Payment processed successfully.");
 return true;
 }
}

class CreditCardPaymentProcessor extends PaymentProcessor {
 validatePaymentDetails(paymentDetails: any): boolean {
 // Validate credit card details
 console.log("Validating credit card details...");
 return true; // Mock validation
 }

 async chargePayment(paymentDetails: any): Promise {
 // Charge credit card
 console.log("Charging credit card...");
 return true; // Mock charge
 }

 async sendConfirmationEmail(paymentDetails: any): Promise {
 // Send confirmation email for credit card payment
 console.log("Sending confirmation email for credit card payment...");
 }
}

const creditCardProcessor = new CreditCardPaymentProcessor();
creditCardProcessor.processPayment({ cardNumber: "1234-5678-9012-3456", expiryDate: "12/24", cvv: "123", amount: 100 });

            

              
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abstract class ReportGenerator {
 abstract generateHeader(): string;
 abstract generateBody(): string;
 abstract generateFooter(): string;

 generateReport(): string {
 const header = this.generateHeader();
 const body = this.generateBody();
 const footer = this.generateFooter();

 return `${header}\n${body}\n${footer}`;
 }
}

class PDFReportGenerator extends ReportGenerator {
 generateHeader(): string {
 return "PDF Report Header";
 }

 generateBody(): string {
 return "PDF Report Body";
 }

 generateFooter(): string {
 return "PDF Report Footer";
 }
}

class CSVReportGenerator extends ReportGenerator {
 generateHeader(): string {
 return "CSV Report Header";
 }

 generateBody(): string {
 return "CSV Report Body";
 }

 generateFooter(): string {
 return "CSV Report Footer";
 }
}

const pdfReportGenerator = new PDFReportGenerator();
console.log(pdfReportGenerator.generateReport());

const csvReportGenerator = new CSVReportGenerator();
console.log(csvReportGenerator.generateReport());

            

              
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abstract class Configuration {
 abstract apiKey: string;
 abstract apiUrl: string;

 getFullApiUrl(): string {
 return `${this.apiUrl}/${this.apiKey}`;
 }
}

class ProductionConfiguration extends Configuration {
 apiKey: string = "prod_api_key";
 apiUrl: string = "https://api.example.com/prod";
}

class DevelopmentConfiguration extends Configuration {
 apiKey: string = "dev_api_key";
 apiUrl: string = "http://localhost:3000/dev";
}

const prodConfig = new ProductionConfiguration();
console.log(prodConfig.getFullApiUrl()); // Output: https://api.example.com/prod/prod_api_key

const devConfig = new DevelopmentConfiguration();
console.log(devConfig.getFullApiUrl()); // Output: http://localhost:3000/dev/dev_api_key

            

              
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// Define a type for the constructor of a class
type Constructor = new (...args: any[]) => T;

// Define a mixin function
function Timestamped(Base: TBase) {
 return class extends Base {
 timestamp = new Date();
 };
}

// Another mixin function
function Logged(Base: TBase) {
 return class extends Base {
 log(message: string) {
 console.log(`${this.constructor.name}: ${message}`);
 }
 };
}

abstract class BaseEntity {
 abstract id: number;
}

// Apply the mixins to the BaseEntity abstract class
const TimestampedEntity = Timestamped(BaseEntity);
const LoggedEntity = Logged(TimestampedEntity);

class User extends LoggedEntity {
 id: number = 123;
 name: string = "John Doe";

 constructor() {
 super();
 this.log("User created");
 }
}

const user = new User();
console.log(user.id); // Output: 123
console.log(user.timestamp); // Output: Current timestamp
user.log("User updated"); // Output: User: User updated

            

              
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abstract class Logger {
 abstract log(message: string): void;
}

class ConsoleLogger extends Logger {
 log(message: string): void {
 console.log(`[Console]: ${message}`);
 }
}

class FileLogger extends Logger {
 log(message: string): void {
 // Implementation to log to a file
 console.log(`[File]: ${message}`);
 }
}

class AppService {
 private logger: Logger;

 constructor(logger: Logger) {
 this.logger = logger;
 }

 doSomething() {
 this.logger.log("Doing something...");
 }
}

// Inject the ConsoleLogger
const consoleLogger = new ConsoleLogger();
const appService1 = new AppService(consoleLogger);
appService1.doSomething();

// Inject the FileLogger
const fileLogger = new FileLogger();
const appService2 = new AppService(fileLogger);
appService2.doSomething();

            

              
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