"or" condition in Elixir in pattern matching

Question

How can I do, if I can, pattern matching with "or" condition? I need this because I have some different conditions for which action is the same?

case something123 do
  :a -> func1()
  :b -> func1()
  :c -> func1()
  :d -> func2()
end

Answer 1

You can use in and lists:

case something123 do
  x when x in [:a, :b, :c] -> func1()
  :d -> func2()
end

x in [:a, :b, :c] expands to x == :a or x == :b or x == :c when the in macro detects it's being called from a guard statement and the RHS is a literal list (because you can't call remote functions from guards).

Answer 2

You can also use cond to do it.

cond do
  something123 == :a or something123 == :b something123 == :c ->
    func1()
  something123 == :d ->
    func2()
end