codewars: solve 'anagram detection' problem

codewars/elixir/anagram/.formatter.exs

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+# Used by "mix format"
+[
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+]

codewars/elixir/anagram/.gitignore

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+# The directory Mix will write compiled artifacts to.
+/_build/
+
+# If you run "mix test --cover", coverage assets end up here.
+/cover/
+
+# The directory Mix downloads your dependencies sources to.
+/deps/
+
+# Where third-party dependencies like ExDoc output generated docs.
+/doc/
+
+# Ignore .fetch files in case you like to edit your project deps locally.
+/.fetch
+
+# If the VM crashes, it generates a dump, let's ignore it too.
+erl_crash.dump
+
+# Also ignore archive artifacts (built via "mix archive.build").
+*.ez
+
+# Ignore package tarball (built via "mix hex.build").
+anagram-*.tar
+
+# Temporary files, for example, from tests.
+/tmp/

codewars/elixir/anagram/README.md

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+# Anagram
+
+An anagram is the result of rearranging the letters of a word to produce a new word.
+
+Note: anagrams are case insensitive.
+
+Complete the function to return true if the two arguments given are anagrams of each other; return false otherwise.
+
+
+## Examples
+
+- "foefet" is an anagram of "toffee"
+- "Buckethead" is an anagram of "DeathCubeK"

codewars/elixir/anagram/lib/anagram.ex

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+defmodule Anagram do
+  @spec anagram?(a :: String.t(), b :: String.t()) :: boolean
+  def anagram?(a, b) do
+    Map.equal?(to_symbols(a), to_symbols(b))
+  end
+
+  @spec to_symbols(a :: String.t()) :: map()
+  defp to_symbols(a) do
+    a
+    |> String.downcase()
+    |> String.graphemes()
+    |> Enum.frequencies()
+  end
+end

codewars/elixir/anagram/mix.exs

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+defmodule Anagram.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :anagram,
+      version: "0.1.0",
+      elixir: "~> 1.16",
+      start_permanent: Mix.env() == :prod,
+      deps: deps()
+    ]
+  end
+
+  # Run "mix help compile.app" to learn about applications.
+  def application do
+    [
+      extra_applications: [:logger]
+    ]
+  end
+
+  # Run "mix help deps" to learn about dependencies.
+  defp deps do
+    [
+      # {:dep_from_hexpm, "~> 0.3.0"},
+      # {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
+    ]
+  end
+end

codewars/elixir/anagram/test/anagram_test.exs

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+defmodule AnagramTest do
+  use ExUnit.Case
+  import Anagram
+  doctest Anagram
+
+  test "some test description" do
+    assert anagram?("foefet", "toffee") === true
+    assert anagram?("Buckethead", "DeathCubeK") === true
+    assert anagram?("Twoo", "WooT") === true
+    assert anagram?("dumble", "bumble") === false
+    assert anagram?("ound", "round") === false
+    assert anagram?("apple", "pale") === false
+  end
+end

codewars/elixir/anagram/test/test_helper.exs

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+ExUnit.start()