CODEWITHSUNDEEP
elixir
Kooooro
Kooooro

Reputation: 453

"or" condition in Elixir in pattern matching

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

Upvotes: 7

Views: 8348

Answers (3)

vfsoraki
vfsoraki

Reputation: 2307

You can also use cond to do it.

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

Upvotes: 7

Justin Wood
Justin Wood

Reputation: 10041

You could use multiple function heads and then multiple working function. Something along the lines of

def foo(%{"key" => "value"}), do: do_something()
def foo(%{"other_key" => "other_value"}), do: do_something()
def foo(map), do: do_something_else(map)

defp do_something() do
  ...
end

defp do_something_else(map) do
  ...
end

This would allow you to match on the data that you need, and act accordingly.

Upvotes: 4

Dogbert
Dogbert

Reputation: 222060

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).

Upvotes: 20

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