Minimal Elixir Book Prep

send and receive messages

# A simple process that receives a message
pid = spawn(fn ->
  receive do
    {:hello, from} ->
      IO.puts("Hello from #{inspect(from)}")
      send(from, :ok)
  end
end)

send(pid, {:hello, self()})

receive do
  :ok -> IO.puts("All good!")
end

"Process ID : #{inspect(self())}"

send(self(), {:no_handler, "Sit idle"})

receive do
  {:no_handler, msg} -> IO.puts(msg)
end

child_pid = spawn(fn -> 
  receive do
    {:no_handler, msg} -> IO.puts(msg)
  end
end)

send(child_pid, {:child, "are you OK?"})

IO.inspect(:erlang.process_info(self(), :messages), label: "Current mailbox")

spawn_link

spawn(fn -> raise "oops" end)
IO.puts("Still running!")

spawn_link(fn -> raise "fail fast" end)
IO.puts("you won't see this")

Process.flag(:trap_exit, true)

spawn_link(fn -> exit(:oops) end)

receive do
  {:EXIT, pid, reason} ->
    IO.puts("Linked process #{inspect(pid)} exited with reason: #{inspect(reason)}")
end

Regex

Regex.replace