Could someone explain the syntax for the case h :: t. In particular to the
right of the => h flatmap. I'm confused where we have a space between h and
flatmap.
>From what I understand h is of type Option[A] and not sure what flatmap
should be.
Likewise for inside the flatmap right of the =>. sequence(t) map(...). The
space between sequence(t) and map(...).
def sequence[A](a: List[Option[A]]): Option[List[A]] =
a match {
case Nil => Some(Nil)
case h :: t => h flatMap (hh => sequence(t) map (hh :: _))
}
https://github.com/fpinscala/fpinscala/blob/master/answerkey/errorhandling/04.answer.scala
Thanks,
Tony
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