The Awesome Programmer

The Awesome Programmer

Factory Design Pattern - Javascript

Factory Design Pattern - Javascript

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Factory Design Pattern

  • Factory design pattern is one of the creational design patterns.
  • Factory design pattern describes how the object should be created.
  • It is used to separate the object creation logic from the rest of our code.
  • It has only one responsibility. i.e. to create objects only based on the provided inputs.
  • It simplifies the object creation logic by having the object creation logic at one place.

When to use Factory Design Pattern

  • When we need to keep the object creation logic in one place.
  • To separate out the responsibility of object creation from the code which uses these objects.

Code example

  • The shape is one of the examples which we can use in our code example.
class Shape {
    constructor(description) {
        this.description = description;
    }
}

class shapeFactory {
    createShape(shapeType) {
        switch(shapeType) {
            case 'square':
                return new Shape('Square shape');
            case 'rectangle':
                return new Shape('Rectangle shape');
            case 'circle':
                return new Shape('Circle shape');
        }
    }
}

const factory = new shapeFactory();
const circle = factory.createShape('circle');
const square = factory.createShape('square');
const rectangle = factory.createShape('rectangle');

console.log(circle); // Shape {description: 'Circle shape'}
console.log(square); // Shape {description: 'Square shape'}
console.log(rectangle); // Shape {description: 'Rectangle shape'}
  • In this example, you can see that the shapeFactory is a factory class that creates shape objects based on the shapeType provided.
  • You can find the code in the GitHub repository.

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