pangram

elixir/pangram/lib/pangram.ex

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+defmodule Pangram do
+  @doc """
+  Determines if a word or sentence is a pangram.
+  A pangram is a sentence using every letter of the alphabet at least once.
+
+  Returns a boolean.
+
+    ## Examples
+
+      iex> Pangram.pangram?("the quick brown fox jumps over the lazy dog")
+      true
+
+  """
+
+  @alphabet Enum.to_list(?A..?Z)
+
+  @spec pangram?(String.t()) :: boolean
+  def pangram?(sentence) do
+    letters =
+      sentence
+      |> String.upcase()
+      |> String.to_charlist()
+
+    @alphabet -- letters == []
+  end
+end