anagram

anagram/lib/anagram.ex

@@ -3,6 +3,13 @@ defmodule Anagram do
   Returns all candidates that are anagrams of, but not equal to, 'base'.
   """
   @spec match(String.t(), [String.t()]) :: [String.t()]
-  def match(base, candidates) do
-  end
+  def match(base, candidates),
+    do:
+      Enum.filter(
+        candidates,
+        &(String.downcase(&1) != String.downcase(base) and
+            to_graphemes(&1) == to_graphemes(base))
+      )
+
+  defp to_graphemes(string), do: String.downcase(string) |> String.graphemes() |> Enum.sort()
 end

anagram/test/anagram_test.exs

@@ -1,85 +1,71 @@
 defmodule AnagramTest do
   use ExUnit.Case
 
-  # @tag :pending
   test "no matches" do
     matches = Anagram.match("diaper", ~w(hello world zombies pants))
     assert matches == []
   end
 
-  @tag :pending
   test "detects two anagrams" do
     matches = Anagram.match("solemn", ~w(lemons cherry melons))
     assert matches == ~w(lemons melons)
   end
 
-  @tag :pending
   test "does not detect anagram subsets" do
     matches = Anagram.match("good", ~w(dog goody))
     assert matches == []
   end
 
-  @tag :pending
   test "detects anagram" do
     matches = Anagram.match("listen", ~w(enlists google inlets banana))
     assert matches == ~w(inlets)
   end
 
-  @tag :pending
   test "detects three anagrams" do
     matches = Anagram.match("allergy", ~w(gallery ballerina regally clergy largely leading))
     assert matches == ~w(gallery regally largely)
   end
 
-  @tag :pending
   test "detects multiple anagrams with different case" do
     matches = Anagram.match("nose", ~w(Eons ONES))
     assert matches == ~w(Eons ONES)
   end
 
-  @tag :pending
   test "does not detect non-anagrams with identical checksum" do
     matches = Anagram.match("mass", ~w(last))
     assert matches == []
   end
 
-  @tag :pending
   test "detect anagrams case-insensitively" do
     matches = Anagram.match("orchestra", ~w(cashregister Carthorse radishes))
     assert matches == ~w(Carthorse)
   end
 
-  @tag :pending
   test "detects anagrams using case-insensitive subject" do
     matches = Anagram.match("Orchestra", ~w(cashregister carthorse radishes))
     assert matches == ~w(carthorse)
   end
 
-  @tag :pending
   test "detects anagrams using case-insensitive possible matches" do
     matches = Anagram.match("orchestra", ~w(cashregister Carthorse radishes))
     assert matches == ~w(Carthorse)
   end
 
-  @tag :pending
   test "does not detect an anagram if the original word is repeated" do
     matches = Anagram.match("go", ~w(go Go GO))
     assert matches == []
   end
 
-  @tag :pending
   test "anagrams must use all letters exactly once" do
     matches = Anagram.match("tapper", ~w(patter))
     assert matches == []
   end
 
-  @tag :pending
   test "words are not anagrams of themselves (case-insensitive)" do
     matches = Anagram.match("BANANA", ~w(BANANA Banana banana))
     assert matches == []
   end
 
-  @tag :pending
   test "words other than themselves can be anagrams" do
     matches = Anagram.match("LISTEN", ~w(Listen Silent LISTEN))
     assert matches == ~w(Silent)