Add Elixir examples for hash tables

05_hash_tables/elixir/01_price_of_groceries.exs

@@ -0,0 +1,9 @@
+import Map, only: [put: 3]
+
+book =
+  %{}
+  |> put("apple", 0.67)
+  |> put("milk", 1.49)
+  |> put("avocado", 1.49)
+
+IO.inspect(book)

05_hash_tables/elixir/02_check_voter.exs

@@ -0,0 +1,14 @@
+defmodule Voting do
+  def check_voter(voters_map, name) do
+    if Map.has_key?(voters_map, name) do
+      IO.puts("kick them out!")
+    else
+      IO.puts("let them vote!")
+      Map.put(voters_map, name, true)
+    end
+  end
+end
+
+Voting.check_voter(%{}, "tom")
+|> Voting.check_voter("mike")
+|> Voting.check_voter("mike")