in Design Patterns

Design Patterns: Simple Factory

A simple factory is an object that is used to generate an instance of an object for the client.

The simplest way of understanding a factory is a object for creating other objects.

Real World Example

For example if we had 3 types of cars and wanted to create a factory that will create the car classes for us.

We can start with an interface to define a car.

<?php

namespace SimpleFactory;

interface Car
{

}

Then each car will implement this car interface.

<?php

namespace SimpleFactory;

class Tesla implements Car
{

}

Then we'll create the factory to make these car classes.

<?php

namespace SimpleFactory;

class CarFactory
{
    public function makeTesla() : Car
    {
        return new Tesla;
    }

    public function makeBmw() : Car
    {
        return new Bmw;
    }

    public function makeMercedes() : Car
    {
        return new Mercedes;
    }
}

When To use

This can be very useful when you need a centrised location for creating objects. Let's say these objects need to be created in a specific way with specific parameters each time the factory pattern allows us to put this into a factory instead of duplicating the code throughout the application.

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