How can I implement the Command Pattern in different programming languages?

How can I implement the Command Pattern in different programming languages?

The Command Pattern is a behavioral design pattern that turns a request into a stand-alone object. This allows for parameterization of clients with queues, requests, and operations. Would you like examples in specific languages?

Yes, can you show me how to do it in Python?

Sure! In Python, you can create a Command interface and concrete command classes. Here's a simple example:

class Command:
    def execute(self):
        pass

class LightOnCommand(Command):
    def __init__(self, light):
        self.light = light

    def execute(self):
        self.light.turn_on()

class Light:
    def turn_on(self):
        print('The light is on!')

# Usage
light = Light()
light_on = LightOnCommand(light)
light_on.execute()

What about Java? Can you provide a similar example?

Absolutely! Here's how you can implement the Command Pattern in Java:

// Command interface
interface Command {
    void execute();
}

// Concrete command
class LightOnCommand implements Command {
    Light light;

    public LightOnCommand(Light light) {
        this.light = light;
    }

    public void execute() {
        light.turnOn();
    }
}

// Receiver class
class Light {
    public void turnOn() {
        System.out.println("The light is on!");
    }
}

// Usage
Light light = new Light();
Command lightOn = new LightOnCommand(light);
lightOn.execute();

Thanks! Can you also explain how to implement it in JavaScript?

Of course! Here's a simple implementation in JavaScript:

// Command interface
class Command {
    execute() {}
}

// Concrete command
class LightOnCommand extends Command {
    constructor(light) {
        super();
        this.light = light;
    }

    execute() {
        this.light.turnOn();
    }
}

// Receiver class
class Light {
    turnOn() {
        console.log('The light is on!');
    }
}

// Usage
const light = new Light();
const lightOn = new LightOnCommand(light);
lightOn.execute();