/**
* Wrap provided value inside a Foldable.
*
* @param array|ArrayObject|FoldableInterface $input
*
* @return ArrayList
* @throws CoreException
* @throws InvalidArgumentException
*/
public static function toFoldable($input)
{
Arguments::define(Boa::foldable())->check($input);
if ($input instanceof FoldableInterface) {
return $input;
}
if (is_array($input) || $input instanceof ArrayObject) {
return static::toList($input);
}
throw new CoreException('Unable to build Foldable');
}
/**
* Same as foldl but it works from right to left.
*
* @param callable $function
* @param mixed $initial
* @param array|FoldableInterface $foldable
*
* @return mixed
*/
public static function foldr(callable $function, $initial, $foldable)
{
Arguments::define(Boa::func(), Boa::any(), Boa::foldable())->check($function, $initial, $foldable);
return ComplexFactory::toFoldable($foldable)->foldr($function, $initial);
}
