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Decorator pattern

mahnaz foroutan answered on December 29, 2022 Popularity 10/10 Helpfulness 1/10

answer Decorator pattern

related decorator design pattern

Decorator pattern

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// Pizza interface representing the core pizza functionality
public interface IPizza
{
    string GetDescription();
    decimal GetCost();
}

// Concrete pizza class implementing the IPizza interface
public class PlainPizza : IPizza
{
    public string GetDescription()
    {
        return "Plain Pizza";
    }

    public decimal GetCost()
    {
        return 10.0M;
    }
}

// Abstract decorator class implementing the IPizza interface
public abstract class PizzaDecorator : IPizza
{
    protected IPizza pizza;

    public PizzaDecorator(IPizza pizza)
    {
        this.pizza = pizza;
    }

    public virtual string GetDescription()
    {
        return pizza.GetDescription();
    }

    public virtual decimal GetCost()
    {
        return pizza.GetCost();
    }
}

// Concrete decorator classes adding toppings to the pizza
public class CheeseDecorator : PizzaDecorator
{
    public CheeseDecorator(IPizza pizza) : base(pizza)
    {
    }

    public override string GetDescription()
    {
        return pizza.GetDescription() + ", Cheese";
    }

    public override decimal GetCost()
    {
        return pizza.GetCost() + 2.0M;
    }
}

public class TomatoDecorator : PizzaDecorator
{
    public TomatoDecorator(IPizza pizza) : base(pizza)
    {
    }

    public override string GetDescription()
    {
        return pizza.GetDescription() + ", Tomato";
    }

    public override decimal GetCost()
    {
        return pizza.GetCost() + 1.5M;
    }
}

class Program
{
    static void Main()
    {
        // Client code creates and decorates the pizza with toppings
        IPizza pizza = new TomatoDecorator(new CheeseDecorator(new PlainPizza()));

        Console.WriteLine("Pizza Description: " + pizza.GetDescription());
        Console.WriteLine("Pizza Cost: $" + pizza.GetCost());
    }
}

Popularity 10/10 Helpfulness 1/10 Language csharp

Source: chat.openai.com

Tags: c# decorator

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Contributed on Jul 30 2023

mahnaz foroutan

0 Answers Avg Quality 2/10

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decorator design pattern

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4. Decorator:
The Decorator pattern lets you attach additional responsibilities to objects dynamically. Decorators provide a flexible alternative to subclassing for extending functionality.

Example in ReactJS:

Imagine you have a text input component and you want to decorate it with additional features like validation.

// TextInput.js
const TextInput = ({ label, value, onChange }) => (
  <div>
    <label>{label}</label>
    <input type="text" value={value} onChange={onChange} />
  </div>
);

// Decorator for Validation
const withValidation = (WrappedComponent) => ({ label, value, onChange, validate }) => {
  const isValid = validate(value);

  return (
    <div>
      <WrappedComponent label={label} value={value} onChange={onChange} />
      <p>{isValid ? "Valid" : "Invalid"}</p>
    </div>
  );
};

// Usage
const ValidatedTextInput = withValidation(TextInput);

const App = () => (
  <ValidatedTextInput
    label="Username"
    value="user123"
    onChange={(e) => console.log(e.target.value)}
    validate={(value) => value.length >= 6}
  />
);

Popularity 10/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: decorator deco

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Contributed on Sep 04 2023

Amjad Saeed

0 Answers Avg Quality 2/10

decorator design pattern

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interface Color{
    void fill();
}

//concrete component of the base interface
class Black implements Color{
    @Override
    public void fill(){
        System.out.println("Black color");
    }
}

//abstract decorator class
abstract class ColorDecorator implements Color{

    //base class object
    protected Color colored;
    
    //constructor with base class object as the parameter
    public ColorDecorator(Color colored){
        this.colored = colored;
    }
    
    public void fill(){
        colored.fill();
    }
}

//concrete decorator class extending base decorator class
class PatternDecorator extends ColorDecorator{
    public PatternDecorator(Color colored){
        super(colored);
    }
    
    public void fill(){
        colored.fill();
        addPattern(colored);
    }
    
    private void addPattern(Color colored){
        System.out.println("Pattern");
    }
}

class Demo{
    public static void main(String[] args){
    
    Color black = new Black();
    Color pattern = new PatternDecorator(new Black());
     
    System.out.println("\nStyle: Solid");
    black.fill();
    
    System.out.println("\nStyle: Pattern");
    pattern.fill();
    }
}

Popularity 10/10 Helpfulness 1/10 Language java

Source: www.scaler.com

Tags: decorator deco

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Contributed on Dec 29 2022

Deepika Sahu

0 Answers Avg Quality 2/10

Decorator pattern

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decorator design pattern

decorator design pattern

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