- Published Year: 2019
- Page count: 350[338]
- File Size: 7 Mb
- Language: English
- Published by: Packt
- Visited by: 114
- Rating/Review: 0.0
- ISBN: 9781789530179
Keywords:
React Design Patterns and Best Practices: Design, build & deploy production-ready web apps using standard industry practices
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Carlos Santana RoldánQuestions about Book
pouriya
tell me about factory design patterns in this book and give me a example
Book's Answer:
( AI as Carlos Santana Roldán )In my book "React Design Patterns and Best Practices", the Factory Design Pattern is one of the most commonly used creational design patterns in React. The Factory pattern provides a way to create an object without specifying the exact class of object that will be created. It defers the instantiation to its subclasses.
The Factory pattern can be useful in several scenarios in React:
1. **To create complex components:** Sometimes you might have components that need to follow specific constraints or behaviors but need to maintain a uniform interface.
2. **To manage multiple representations:** Sometimes we might need to provide different ways of rendering a certain component based on specific conditions.
3. **To handle different implementations:** It can be useful to create different implementations of the same functionality based on the requirements.
Here's an example:
```
// Define the interface for creating different types of cars.
interface Car {
drive(): string;
startEngine(): void;
}
// Define classes for different types of cars.
class Toyota implements Car {
startEngine(): void {
console.log("Starting Toyota engine");
}
drive(): string {
return "Driving my Toyota";
}
}
class Ford implements Car {
startEngine(): void {
console.log("Starting Ford engine");
}
drive(): string {
return "Driving my Ford";
}
}
// Define the car factory that creates objects based on different types.
class CarFactory {
public createCar(carType: string): Car {
if (carType === 'Toyota') {
return new Toyota();
} else if (carType === 'Ford') {
return new Ford();
} else {
throw new Error("Car type not supported");
}
}
}
// Use the factory to create and use different types of cars.
function main() {
let carType = 'Toyota';
let car = new CarFactory().createCar(carType);
car.startEngine();
console.log(car.drive());
}
```
In this example, we have a `CarFactory` that creates different types of cars (Toyota and Ford). The `CarFactory` acts as a creator that is responsible for creating different objects of different classes (`Toyota` and `Ford`) based on different conditions.
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