Trying to use Cons function in Purescript

Question

Heres my code:

print 1: [2,3]

When I run it I get

  Cannot unify type
    Data.List.List
  with type
    Prim.Array

Whats going on?

Answer 1

[2, 3] has type Array Int. (:) has type a -> List a -> List a in Data.List. You need to convert to a List. Also, what you have will parse as

(print 1) : [2, 3]

I think you want

print (1 : toList [2, 3])

or

print $ 1 : toList [2, 3]