learning-fpinscala

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```scala def hasSubsequence[A](xs: List[A], sub: List[A]): Boolean = (xs, sub) match { case (_, Nil) ⇒ true case (Cons(h1, t1), Cons(h2, t2)) if h1 == h2 ⇒ startWith(t1, t2) case...

objectisundefined

http://chris-taylor.github.io/blog/2013/02/10/the-algebra-of-algebraic-data-types/

kun-song