OCaml Error Unbound value List.unzip

Question

Any idea why I am getting this error:

utop # let (ints,strings) = List.unzip [(1,"one"); (2,"two"); (3,"three")];;
Error: Unbound value List.unzip 

Answer 1

There is no List.unzip in the standard library.
I'm guessing you're looking for List.split :

# let (ints,strings) = List.split [(1,"one"); (2,"two"); (3,"three")];;
val ints : int list = [1; 2; 3]
val strings : string list = ["one"; "two"; "three"]

---

Note: There is a List.unzip function in OCaml-Core. If you're using it, you probably didn't open the corresponding module.

Answer 2

Base库中提供了List.unzip，您需要安装它。