DIP.ts

interface Data {
    id: number;
    name: string;
}

// Abstraction layer representing a database
interface Database {
    save(data: Data): void;
    update(data: Data): void;
}

// High-level module depending on Database interface
class DataManager {
    constructor(private database: Database) {}

    saveData(data: Data): void {
        this.database.save(data);
    }

    updateData(data: Data): void {
        this.database.update(data);
    }
}

// Low-level module implementing Database interface for MySQL
class MySQLDatabase implements Database {
    save(data: Data): void {
        console.log("Data saved to MySQL database");
    }

    update(data: Data): void {
        console.log("Data updated in MySQL database");
    }
}

// Low-level module implementing Database interface for MongoDB
class MongoDBDatabase implements Database {
    save(data: Data): void {
        console.log("Data saved to MongoDB database");
    }

    update(data: Data): void {
        console.log("Data updated in MongoDB database");
    }
}

// Creating an instance of MySQLDatabase (low-level module)
const mySQLDatabase = new MySQLDatabase();

// Creating an instance of DataManager (high-level module)
const dataManager = new DataManager(mySQLDatabase);

// Using DataManager methods
dataManager.saveData({ id: 1, name: "John" });
dataManager.updateData({ id: 1, name: "John Doe" });

// Creating an instance of MongoDBDatabase (low-level module)
const mongoDBDatabase = new MongoDBDatabase();

// Creating another instance of DataManager with MongoDBDatabase
const anotherDataManager = new DataManager(mongoDBDatabase);

// Using DataManager methods with MongoDB
anotherDataManager.saveData({ id: 2, name: "Alice" });
anotherDataManager.updateData({ id: 2, name: "Alice Smith" });