/**
* Creates a lazy-option with the given callback.
*
* This is also a helper constructor for lazy-consuming existing APIs where
* the return value is not yet an option. By default, we treat ``null`` as
* None case, and everything else as Some.
*
* @param callable $callback The callback to evaluate.
* @param array $arguments
* @param mixed $noneValue The value which should be considered "None"; null
* by default.
*
* @return Option
*/
public static function fromReturn($callback, array $arguments = array(), $noneValue = null)
{
return new LazyOption(function () use($callback, $arguments, $noneValue) {
$return = call_user_func_array($callback, $arguments);
if ($return === $noneValue) {
return None::create();
}
return new Some($return);
});
}
public function reject($value)
{
if ($this->value === $value) {
return None::create();
}
return $this;
}
