Value Object

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

Overview

A Value Object (VO) is an immutable type that is only distinguishable by the state of its properties, that is, unlike an entity, which has a unique identifier and remains distinct even if its properties are identical, VOs with the same properties can be considered the same.

Because they are immutable, VOs cannot be changed once created. Modifying one is conceptually the same as discard the old one and create a new one.

More details about VOs.

Installation

composer require tiny-blocks/value-object

How to use

The library exposes available behaviors through the ValueObject interface, and the implementation of these behaviors through the ValueObjectAdapter trait.

Concrete implementation

With the implementation of the ValueObject interface, and the ValueObjectAdapter trait, the use of __get, __set and __unset methods is suppressed, making the object immutable.

<?php

namespace Example;

use TinyBlocks\Vo\ValueObject;
use TinyBlocks\Vo\ValueObjectAdapter;

final class TransactionId implements ValueObject
{
    use ValueObjectAdapter;

    public function __construct(private readonly string $value)
    {
    }
}

Using the equals method

The equals method compares the value of two VOs, and checks if they are equal.

$transactionId = new TransactionId(value: 'e6e2442f-3bd8-421f-9ac2-f9e26ac4abd2');
$otherTransactionId = new TransactionId(value: 'e6e2442f-3bd8-421f-9ac2-f9e26ac4abd2');

$transactionId->equals(other: $otherTransactionId); # 1 (true)

License

Value Object is licensed under MIT.

Contributing

Please follow the contributing guidelines to contribute to the project.