Use of Factory Method Pattern in React Js
In ReactJS, the Factory Method is a design pattern that helps in the creation of objects with different behavior while keeping the creation process consistent. The pattern is used to create objects of a specific class, but the specific subclass that should be instantiated is decided by the factory method at runtime. This pattern is useful when you have to create many objects that share some common behavior but differ in some details. In this blog, we will explore the Factory Method pattern and how it can be implemented in ReactJS.
What is the Factory Method pattern?
The Factory Method pattern is a creational pattern that provides an interface for creating objects in a superclass, but allows subclasses to alter the type of objects that will be created. The Factory Method pattern encapsulates object creation and is often used to manage object creation in a hierarchy of classes.
The Factory Method pattern has the following components:
- Creator: This is the abstract class that defines the factory method. It provides an interface for creating the objects.
- ConcreteCreator: This is the concrete class that implements the factory method. It creates the objects and returns them to the client.
- Product: This is the abstract class that defines the interface for the objects that the factory method creates.
- ConcreteProduct: This is the concrete class that implements the Product interface.
How to implement the Factory Method pattern in ReactJS?
The Factory Method pattern can be implemented in ReactJS by creating a component that acts as the creator, and then creating subclasses of that component that act as the concrete creators. The component that acts as the creator should define the factory method, and the subclasses should implement the factory method to create the desired objects.
Let's take an example of a simple component that creates different types of buttons. We will create a ButtonFactory component that acts as the creator, and two subclasses of that component, PrimaryButtonFactory and SecondaryButtonFactory, that act as the concrete creators.
import React from 'react';
class ButtonFactory extends React.Component {
createButton() {
throw new Error('createButton() must be overridden in subclass');
}
render() {
const button = this.createButton();
return <div>{button}</div>;
}
}
class PrimaryButtonFactory extends ButtonFactory {
createButton() {
return <button className="primary">Primary Button</button>;
}
}
class SecondaryButtonFactory extends ButtonFactory {
createButton() {
return <button className="secondary">Secondary Button</button>;
}
}
In the above code, the ButtonFactory component is the creator, and it defines the createButton() factory method. The createButton() method is defined as abstract and throws an error when called. This is because the ButtonFactory component itself does not know how to create buttons, and it is up to the subclasses to implement the createButton() method.
The PrimaryButtonFactory and SecondaryButtonFactory components are the concrete creators, and they implement the createButton() method to create primary and secondary buttons respectively.
To use the ButtonFactory component, we can simply render an instance of either the PrimaryButtonFactory or SecondaryButtonFactory component, depending on the type of button we want to create:
import React from 'react';
import { PrimaryButtonFactory, SecondaryButtonFactory } from './ButtonFactory';
class App extends React.Component {
render() {
return (
<div>
<PrimaryButtonFactory />
<SecondaryButtonFactory />
</div>
);
}
}
In the above code, we import the PrimaryButtonFactory and SecondaryButtonFactory components from the ButtonFactory file and render instances of both components in the App component.
Conclusion
The Factory Method pattern is a useful design pattern that can be used to create objects with different behavior while keeping the creation process consistent.
The Factory Method pattern can be used in React to create instances of a component based on certain conditions. This pattern helps in decoupling the code by separating the creation of objects from their usage.
Happy Learning!! Happy Coding!!
Comments