Switch in Elixir

Here’s a basic switch.

defmodule SwitchExample do
  def main do
    i = 2
    IO.write("Write #{i} as ")

    case i do
      1 -> IO.puts("one")
      2 -> IO.puts("two")
      3 -> IO.puts("three")
    end

    case :calendar.day_of_the_week(:calendar.local_time()) do
      7 -> IO.puts("It's the weekend")
      1 -> IO.puts("It's the weekend")
      _ -> IO.puts("It's a weekday")
    end

    case :calendar.local_time() |> elem(0) |> elem(2) do
      h when h < 12 -> IO.puts("It's before noon")
      _ -> IO.puts("It's after noon")
    end

    what_am_i(true)
    what_am_i(1)
    what_am_i("hey")
  end

  defp what_am_i(i) do
    case i do
      _ when is_boolean(i) -> IO.puts("I'm a bool")
      _ when is_integer(i) -> IO.puts("I'm an int")
      _ -> IO.puts("Don't know type #{inspect(i)}")
    end
  end
end

SwitchExample.main()

To run the program, put the code in switch_example.exs and use the elixir command.

$ elixir switch_example.exs
Write 2 as two
It's a weekday
It's after noon
I'm a bool
I'm an int
Don't know type "hey"

Let’s now learn more about the switch-like constructs and how we can use them in the Elixir language.

If Else in Elixir

Arrays in Elixir

Learn X By Example

Title here

Switch in Elixir