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The Maybe nomad revisited from https://hackernoon.com/say-goodbye-to-null-checking-and-exceptions-using-the-maybe-monad-in-symfony/
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| <?php | |
| /** | |
| * @template T | |
| */ | |
| class Maybe | |
| { | |
| /** | |
| * @param T|null $value | |
| */ | |
| private function __construct( | |
| private readonly mixed $value | |
| ) { | |
| } | |
| /** | |
| * @param T|null $value | |
| * @return Maybe<T> | |
| */ | |
| public static function just($value): Maybe | |
| { | |
| return new self($value); | |
| } | |
| /** | |
| * @return Maybe<T> | |
| */ | |
| public static function nothing(): Maybe | |
| { | |
| return new self(null); | |
| } | |
| /** | |
| * @template U | |
| * @param callable(T):U $fn | |
| * @return Maybe<U> | |
| */ | |
| public function pipe(callable $fn): Maybe | |
| { | |
| return match (true) { | |
| null === $this->value => $this, | |
| default => self::just($fn($this->value)), | |
| }; | |
| } | |
| /** | |
| * @param T $defaultValue | |
| * @return T | |
| */ | |
| public function value($defaultValue = null) | |
| { | |
| return $this->value ?? $defaultValue; | |
| } | |
| } |
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