Factory pattern in PHP - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a new instance of the Product class using the factory method.

PHP

<?php
class Product {
    public function getName() {
        return "Product";
    }
}

class Factory {
    public static function create() {
        return new [1]();
    }
}

$product = Factory::create();
echo $product->getName();
?>

Drag options to blanks, or click blank then click option'

AFactory

Bcreate

Cnew

DProduct

Attempts:

3 left

💡 Hint

Common Mistakes

Using the factory class name instead of the product class name.

Forgetting to use the 'new' keyword before the class name.

The factory method returns a new instance of the Product class, so 'Product' is the correct class name to instantiate.

2fill in blank

medium

Complete the factory method to return a new instance of the correct class based on the type parameter.

PHP

<?php
interface Vehicle {
    public function drive();
}

class Car implements Vehicle {
    public function drive() {
        return "Driving a car";
    }
}

class Bike implements Vehicle {
    public function drive() {
        return "Riding a bike";
    }
}

class VehicleFactory {
    public static function createVehicle($type) {
        if ($type === '[1]') {
            return new Car();
        } elseif ($type === 'bike') {
            return new Bike();
        }
        return null;
    }
}

$vehicle = VehicleFactory::createVehicle('car');
echo $vehicle->drive();
?>

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Acar

Bbike

Cvehicle

Ddrive

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'bike' instead of 'car' in the if condition.

Using the class name instead of the string type.

The factory method checks if the type is 'car' to create a Car instance, so the string 'car' is the correct value.

3fill in blank

hard

Fix the error in the factory method to correctly instantiate the requested product.

PHP

<?php
abstract class Button {
    abstract public function render();
}

class WindowsButton extends Button {
    public function render() {
        return "Render Windows button";
    }
}

class MacButton extends Button {
    public function render() {
        return "Render Mac button";
    }
}

class ButtonFactory {
    public static function createButton($os) {
        switch ($os) {
            case 'windows':
                return new [1]();
            case 'mac':
                return new MacButton();
            default:
                throw new Exception("Unsupported OS");
        }
    }
}

$button = ButtonFactory::createButton('windows');
echo $button->render();
?>

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AButton

BMacButton

CWindowsButton

DButtonFactory

Attempts:

3 left

💡 Hint

Common Mistakes

Instantiating the abstract Button class.

Using the MacButton class for the windows case.

To create a Windows button, the factory must instantiate the WindowsButton class.

4fill in blank

hard

Fill both blanks to complete the factory method that creates different notification objects.

PHP

<?php
interface Notification {
    public function send();
}

class EmailNotification implements Notification {
    public function send() {
        return "Sending Email Notification";
    }
}

class SMSNotification implements Notification {
    public function send() {
        return "Sending SMS Notification";
    }
}

class NotificationFactory {
    public static function createNotification($method) {
        if ($method [1] 'email') {
            return new EmailNotification();
        } elseif ($method [2] 'sms') {
            return new SMSNotification();
        }
        return null;
    }
}

$notification = NotificationFactory::createNotification('email');
echo $notification->send();
?>

Drag options to blanks, or click blank then click option'

A===

B==

C!=

D<>

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same equality operator for both conditions.

Using inequality operators instead of equality.

The factory method uses strict equality (===) to check for 'email' and loose equality (==) to check for 'sms'.

5fill in blank

hard

Fill all three blanks to complete the factory method that creates shape objects and calls their draw method.

PHP

<?php
interface Shape {
    public function draw();
}

class Circle implements Shape {
    public function draw() {
        return "Drawing Circle";
    }
}

class Square implements Shape {
    public function draw() {
        return "Drawing Square";
    }
}

class ShapeFactory {
    public static function createShape($type) {
        return match($type) {
            'circle' => new [1](),
            'square' => new [2](),
            default => throw new Exception("Unknown shape"),
        };
    }
}

$shape = ShapeFactory::createShape('[3]');
echo $shape->draw();
?>

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ACircle

BSquare

Ccircle

Dsquare

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up class names and string types.

Using the wrong string for the shape type.

The factory creates a Circle or Square object based on the type string 'circle' or 'square'.