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composite design pattern

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Amjad Saeed answered on May 8, 2022 Popularity 9/10 Helpfulness 1/10

answer composite design pattern

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composite design pattern

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3. Composite:
The Composite pattern lets you compose objects into tree structures to represent part-whole hierarchies. It allows clients to treat individual objects and compositions of objects uniformly.

Example in ReactJS:

Suppose you're building a hierarchical navigation menu.

// MenuItem.js
const MenuItem = ({ title }) => <div>{title}</div>;

// Menu.js
const Menu = ({ items }) => (
  <ul>
    {items.map((item, index) => (
      <li key={index}>
        {item}
      </li>
    ))}
  </ul>
);

// Usage
const App = () => {
  const menuItems = [
    <MenuItem title="Home" />,
    <MenuItem title="About" />,
    <MenuItem title="Services" />,
  ];

  return (
    <div>
      <h1>Menu</h1>
      <Menu items={menuItems} />
    </div>
  );
};

Popularity 9/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: composite javascript

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Contributed on Sep 03 2023

Amjad Saeed

0 Answers Avg Quality 2/10

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Composite pattern

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using System;
using System.Collections.Generic;

// Component interface
public interface IShape
{
    void Draw();
}

// Leaf (individual) object
public class Circle : IShape
{
    public void Draw()
    {
        Console.WriteLine("Drawing a circle.");
    }
}

// Leaf (individual) object
public class Square : IShape
{
    public void Draw()
    {
        Console.WriteLine("Drawing a square.");
    }
}

// Composite (group) object
public class Drawing : IShape
{
    private readonly List<IShape> shapes = new List<IShape>();

    public void AddShape(IShape shape)
    {
        shapes.Add(shape);
    }

    public void RemoveShape(IShape shape)
    {
        shapes.Remove(shape);
    }

    public void Draw()
    {
        Console.WriteLine("Drawing the drawing:");
        foreach (var shape in shapes)
        {
            shape.Draw();
        }
    }
}

class Program
{
    static void Main()
    {
        // Client code
        IShape circle = new Circle();
        IShape square = new Square();

        Drawing drawing = new Drawing();
        drawing.AddShape(circle);
        drawing.AddShape(square);

        IShape anotherCircle = new Circle();
        drawing.AddShape(anotherCircle);

        drawing.Draw();

        /*
         * Sample Output:
         * Drawing the drawing:
         * Drawing a circle.
         * Drawing a square.
         * Drawing a circle.
         */
    }
}

Popularity 9/10 Helpfulness 2/10 Language csharp

Source: chat.openai.com

Tags: c# c

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Contributed on Jul 31 2023

mahnaz foroutan

0 Answers Avg Quality 2/10

composite pattern

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// Component interface
interface Component {
    public function operation();
}

// Leaf component
class Leaf implements Component {
    public function operation() {
        echo "Leaf operation\n";
    }
}

// Composite component
class Composite implements Component {
    private $children = [];

    public function add(Component $component) {
        $this->children[] = $component;
    }

    public function operation() {
        echo "Composite operation\n";
        foreach ($this->children as $child) {
            $child->operation();
        }
    }
}

// Usage
$leaf1 = new Leaf();
$leaf2 = new Leaf();

$composite1 = new Composite();
$composite1->add($leaf1);
$composite1->add($leaf2);

$leaf3 = new Leaf();

$composite2 = new Composite();
$composite2->add($composite1);
$composite2->add($leaf3);

$composite2->operation();

Popularity 6/10 Helpfulness 1/10 Language php

Source: chat.openai.com

Tags: composite php

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Contributed on Mar 01 2024

Colorful Cat

0 Answers Avg Quality 2/10

composite design pattern

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import java.util.List;
import java.util.ArrayList;

/** "Component" */
interface Graphic {
    //Prints the graphic.
    public void print();
}

/** "Composite" */
class CompositeGraphic implements Graphic {
    //Collection of child graphics.
    private final List<Graphic> childGraphics = new ArrayList<>();

    //Adds the graphic to the composition.
    public void add(Graphic graphic) {
        childGraphics.add(graphic);
    }
    
    //Prints the graphic.
    @Override
    public void print() {
        for (Graphic graphic : childGraphics) {
            graphic.print();  //Delegation
        }
    }
}

/** "Leaf" */
class Ellipse implements Graphic {
    //Prints the graphic.
    @Override
    public void print() {
        System.out.println("Ellipse");
    }
}

/** Client */
class CompositeDemo {
    public static void main(String[] args) {
        //Initialize four ellipses
        Ellipse ellipse1 = new Ellipse();
        Ellipse ellipse2 = new Ellipse();
        Ellipse ellipse3 = new Ellipse();
        Ellipse ellipse4 = new Ellipse();

        //Creates two composites containing the ellipses
        CompositeGraphic compositGraphic2 = new CompositeGraphic();
        compositGraphic2.add(ellipse1);
        compositGraphic2.add(ellipse2);
        compositGraphic2.add(ellipse3);
        
        CompositeGraphic compositGraphic3 = new CompositeGraphic();
        compositGraphic3.add(ellipse4);
        
        //Create another graphics that contains two graphics
        CompositeGraphic compositGraphic = new CompositeGraphic();
        compositGraphic.add(compositGraphic2);
        compositGraphic.add(compositGraphic3);

        //Prints the complete graphic (Four times the string "Ellipse").
        compositGraphic.print();
    }
}

Popularity 10/10 Helpfulness 1/10 Language java

Source: en.wikipedia.org

Tags: composite comp

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Contributed on May 08 2022

Shawmoon A

0 Answers Avg Quality 2/10

composite design pattern

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