Immutable Object

• Overview
• Installation
• How to use
• License
• Contributing

Overview

The Immutable Object library ensures that objects implementing it remain immutable after initialization. Once created, the state of the object cannot be modified. Any attempt to change properties or collection elements will throw an exception.

Installation

composer require tiny-blocks/immutable-object

How to use

The library provides the Immutable interface and the Immutability trait to guarantee immutability. These components prevent properties and collections from being modified or unset.

Concrete implementation

By implementing the Immutable interface and using the Immutability trait, you can ensure that object properties and elements in collections are immutable.

<?php

namespace Example;

use TinyBlocks\Immutable\Immutable;
use TinyBlocks\Immutable\Immutability;

final class Order implements Immutable
{
    use Immutability;

    public function __construct(public int $id, public Products $products)
    {
    }
}

Handling property immutability

The Immutability trait also prevents modifications to properties of an object. Trying to modify a property after the object is initialized will throw an exception.

$order = new Order(id: 1, products: new Products(array: ['item1', 'item2']);

$order->id = 2;    # Throws an exception
unset($order->id); # Throws an exception  

Handling collection immutability

The Immutability trait also prevents the modification of collection elements (e.g., arrays). Trying to modify or remove an element will throw an exception.

$order = new Order(id: 1, products: new Products(array: ['item1', 'item2']);

$order->items[0] = 'item3'; # Throws an exception
unset($order->items[0]);    # Throws an exception

License

Immutable Object is licensed under MIT.

Contributing

Please follow the contributing guidelines to contribute to the project.