fp4php/fp4php

PHP functional programming library

v0.1.0 2023-09-04 08:52 UTC

Requires

• php: ^8.1
• ext-mbstring: *
• ext-simplexml: *

Requires (Dev)

• ergebnis/composer-normalize: ^2.35
• friendsofphp/php-cs-fixer: ^3.15
• php-coveralls/php-coveralls: ^0.1.0
• phpunit/phpunit: ^10.0
• vimeo/psalm: ^5.15

MIT

• Klimenko Andrew (klimick)

README

Functional programming utilities for PHP.

This library extensively uses curried functions and the pipe combinator.

If you don't like the following code:

self::someMethod(
    array_filter(
        array_map(
            fn ($i) => $i + 1,
            [1, 2, 3],
        ),
        fn ($i) => $i % 2 === 0,
    );
);

Or:

self::someMethod(
    ArrayList::fromIterable([/*...*/]),
        ->map(fn ($i) => $i + 1),
        ->filter(fn ($i) => $i % 2 === 0),
);

Then this library might interest you:

<?php

declare(strict_types=1);

use Fp4\PHP\ArrayList as l;

use function Fp4\PHP\Combinator\pipe;

final class App
{
    /**
     * @param list<int> $list
     * @return list<string>
     */
    public function run(array $list): array
    {
        return pipe(
            $list,
            l\map(fn($i) => $i + 1),
            l\filter(fn($i) => 0 === $i % 2),
            self::toString(...),
        );
    }

    /**
     * @param list<int> $list
     * @return list<string>
     */
    public static function toString(array $list): array
    {
        return pipe(
            $list,
            l\map(fn($i) => (string)$i),
        );
    }
}

To learn more about this library, read the following:

• Pipe
• Option
• Either
• Psalm