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<?php
namespace Seboettg\Collection\Map;
use function Seboettg\Collection\Assert\assertScalar;
final class Pair
{
/**
* @var bool|float|int|string
*/
private $key;
* @var mixed
private $value;
* @param scalar $key
* @param mixed $value
public static function factory($key, $value): Pair
assertScalar($key, "Key must be a scalar.");
return new self($key, $value);
}
private function __construct($key, $value)
$this->key = $key;
$this->value = $value;
* @return scalar
public function getKey()
return $this->key;
* @return mixed
public function getValue()
return $this->value;
public function copy($key = null, $value = null): Pair
return self::factory(
$key === null ? $this->getKey() : $key,
$value === null ? $this->getValue() : $value
);
seboettg /
Collection
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