4 ms·

My guess is it came from Scala? In practice it's not very tough to get it right.

• throwaway7645 9y ago
  Val might have originally been OCaml or Haskell.
  • mahmud 9y ago
    Standard ML, rather. It might have appeared in earlier MLs as an extension.
    • throwaway7645 9y ago
      And I was soooo close :)
  • bschwindHN 9y ago
    I mean the combination of val (immutable) and var (mutable) as keywords to declare bindings. OCaml uses let and so does Haskell, right?