I have read file using scala and for the missing values i have to print as "Missing". I have used case/match/Some/Option to handle it. I end up with "IndexOutOfBound" exception. I have used try catch
在cats中,当使用Monad特征创建Monad时,应提供方法tailRecM的实现。 我有下面,我发现不可能提供尾递归实现的tailRecM sealed trait Tree[+A]
final case class Branch[A](left: Tree[A], right: Tree[A]) extends Tree[A]
final case class Lea