trehinos/thor-option

An option-type for PHP 8.1 and further.

Option type in PHP 8.1+

This package let you use an option (Thor\Maybe\Option) type in PHP to handle cases when a value can or can not take a value.

The API of this module is intensively inspired by Rust's Option type.

Say goodbye to null values

With Thor\Maybe\Option, you can wrap any value (including null) and will never take back a null.

Examples

Playing with some data

use Thor\Maybe\Option;
use Thor\Maybe\Maybe;

$myOption = Option::from("data...");
// Or
$myOption = Option::some("data...");

if ($myOption->isNone()) {
    // Never
}
// Or
if ($myOption->isA(Maybe::NONE)) {
    // Never
}

// Unwrap the optional value
if ($myOption->is() === Maybe::SOME) {
    // Here we know we can unwrap().
    $myString = $myOption->unwrap();
}

// Echoes the string if it is not none, or an empty string if it is :
echo $myOption->matches(
    fn(string $str) => $str,
    fn() => '',
);
// Or
echo $myOption->unwrapOr('');

Handling NONE values

use Thor\Maybe\Option;

$myOption = Option::from(null);
$myOption = Option::none();

$value = $myOption->unwrap(); // Throws a RuntimeException
$value = $myOption->unwrapOrThrow(new Exception("Custom Exception"));
$value = $myOption->unwrapOrElse(fn() => 'default value from callable');
$value = $myOption->unwrapOr('default value');

Reference

Maybe enumeration

• Case SOME to represent the case when an option contains some value,
• Case NONE to represent the absence of value in an option.

Option

Constructors

• Option::from(mixed $value) : create a new option with some value or none if $value is null,
• Option::some(mixed $value) : create a new option with some value,
• Option::none() : create a new option with none.

Informational methods

• $myOption->is() : returns a Maybe::SOME or a Maybe::NONE,
• $myOption->isNone() : returns true if the option is none,
• $myOption->isSome() : returns true if the option is some,
• $myOption->isA(Maybe $maybe) : returns true if the option is corresponding the $maybe case.

Match

Do something with the value if the Option contains a value, or do something else if the value is none.

use Thor\Maybe\Option;
use Thor\Maybe\Maybe;

$myOption = Option::some("data...");

$myOption->matches(
    fn(string $str) => "My Option is Some($str)",
    fn() => 'My Option is None...',
);

Unwrap methods

• $value = $myOption->unwrap() : throws a RuntimeException if the value of the option is none,
• $value = $myOption->unwrapOrThrow(new Exception("Custom Exception")) : throws the specified Throwable if the value of the option is none,
• $value = $myOption->unwrapOrElse(fn() => 'default value from callable') : executes the callable in parameter if the value of the option is none and returns its returned value,
• $value = $myOption->unwrapOr('default value') : returns the specified value if the value of the option is none.

License

Copyright 2024 Sébastien GELDREICH

License MIT