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<?php
declare(strict_types=1);
namespace Baethon\Phln;
final class CurriedFn implements FixedArityInterface
{
/**
* @var callable
*/
private $fn;
private int $arity;
* @var array<int, mixed> $args
private array $args = [];
* @param int $arity
* @param callable $fn,
* @param mixed[] $args
private function __construct(int $arity, callable $fn, array $args = [])
$this->arity = $arity;
$this->fn = $fn;
$this->args = $args;
}
public static function of(callable $fn): self
return ($fn instanceof static)
? new static($fn->arity, $fn->fn, $fn->args)
: static::ofN(Phln::arity($fn), $fn);
public static function ofN(int $arity, callable $fn): self
return new static($arity, $fn);
* @param array<int, mixed> ...$args
* @return CurriedFn|mixed
public function __invoke(...$args)
$allArgs = array_merge($this->args, $args);
return ($this->arity > count($allArgs))
? new static($this->arity, $this->fn, $allArgs)
: call_user_func_array($this->fn, $allArgs);
public function getArity(): int
return $this->arity - count($this->args);
baethon /
phln
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