Elixir Quick Reference

" HELLO " |> String.trim() |> String.downcase() |> String.split(" ") [1, 2, 3, 4, 5] |> Enum.filter(&(rem(&1, 2) == 0)) |> Enum.map(&(&1 * 10)) |> Enum.sum() # 60

# Basic match {:ok, result} = {:ok, 42} [head | tail] = [1, 2, 3] # Function clauses defmodule Math do def factorial(0), do: 1 def factorial(n) when n > 0, do: n * factorial(n - 1) end # Case expression case File.read("file.txt") do {:ok, content} -> process(content) {:error, reason} -> IO.puts("Error: #{reason}") end

# Spawn a process pid = spawn(fn -> IO.puts("Hello from process") end) # Send and receive messages send(pid, {:message, "hello"}) receive do {:message, msg} -> IO.puts("Got: #{msg}") after 5000 -> IO.puts("Timeout") end # Task (async operation) task = Task.async(fn -> heavy_computation() end) result = Task.await(task, 10_000)

defmodule Counter do use GenServer def start_link(initial), do: GenServer.start_link(__MODULE__, initial) def increment(pid), do: GenServer.cast(pid, :increment) def get(pid), do: GenServer.call(pid, :get) @impl true def init(state), do: {:ok, state} @impl true def handle_cast(:increment, state), do: {:noreply, state + 1} @impl true def handle_call(:get, _from, state), do: {:reply, state, state} end