add get/1 function to get single bank given its bank_code

Author: khaapamyaki

lib/bundesbank.ex

@@ -1,8 +1,8 @@
 defmodule Bundesbank do
-    @moduledoc ~S"""
-    A collection of German Bank Data including BIC, Bankcodes, PAN and more useful information based on the [Bundesbank Data Set](https://www.bundesbank.de/de/aufgaben/unbarer-zahlungsverkehr/serviceangebot/bankleitzahlen/download-bankleitzahlen-602592)
+  @moduledoc ~S"""
+  A collection of German Bank Data including BIC, Bankcodes, PAN and more useful information based on the [Bundesbank Data Set](https://www.bundesbank.de/de/aufgaben/unbarer-zahlungsverkehr/serviceangebot/bankleitzahlen/download-bankleitzahlen-602592)
 
-    **Current Data Set is Valid until September, 06th 2020**
+  **Current Data Set is Valid until September, 06th 2020**
   """
 
   @doc """
@@ -12,6 +12,19 @@ defmodule Bundesbank do
     bundesbank()
   end
 
+  @doc """
+  Returns one bank given its code
+  ## Examples
+      iex> %Bundesbank.Bank{bank_name: bank_name} = Bundesbank.get(50010060)
+      iex> bank_name
+      "Postbank Ndl DB PFK"
+  """
+
+  def get(code) do
+    [bank] = filter_by(:code, code)
+    bank
+  end
+
   @doc """
   Filters banks by given key.
 

mix.exs

@@ -14,7 +14,7 @@ defmodule Bundesbank.MixProject do
       name: "Bundesbank",
       source_url: "https://github.com/daskycodes/bundesbank",
       deps: deps(),
-      docs: docs(),
+      docs: docs()
     ]
   end
 

test/bundesbank_test.exs

@@ -9,6 +9,12 @@ defmodule BundesbankTest do
     end
   end
 
+  describe "get/1" do
+    test "gets one bank" do
+      %{code: "50010060"} = Bundesbank.get(50010060)
+    end
+  end
+
   describe "exists?/2" do
     test "checks if bank exists" do
       refute Bundesbank.exists?(:city, "New York")