Code for My First Week With Elixir as a Rubyist

GenServerCall.ex

defmodule OurServer do
  use GenServer

  # ...

  def call({:message, caller_data}, _from, state) do
    {:reply, caller_data, [caller_data]}
  end
end

GenServerCast.ex

defmodule OurServer do
  use GenServer

  # ...

  def cast({:message, caller_data}, state) do
    {:noreply, caller_data}
  end
end

Matching Error

iex> "Not a Match" = a # Throws an error
** (MatchError) no match of right hand side value: "Some String"

Matching Strings

iex> a = "Some String" # Binds string to a
"Some String"
iex> "Some String" = a # Matches a to the pattern
"Some String"

MatchingLists.ex

iex> [head | tail] = [1, 2, 3, 4, 5]
iex> head
1
iex> tail
[2, 3, 4, 5]

MatchingMaps.ex

iex> user = %{id: 1, login: %{user_name: 'bob114', password: 'Apple12Sauce!'}}
iex> %{id: id} = user
iex> id
1
iex> %{login: %{user_name: user_name}} = user
iex> user_name
bob114

RecursionPart1.ex

defmodule Example do
  def any?([], _a), do: false # Matches when the first param is an empty list
end

RecursionPart2.ex

defmodule Example do
  def any?([], _a), do: false
  def any?([head | _tail], a) do
    if head == a do
      true
    end
  end
end

RecursionPart3.ex

defmodule Example do
  def any?([], _a), do: false
  def any?([head | tail], a) do
    if head == a do
      true
    else 
      any?(tail, a) 
    end
  end
end