Anagram

Mix.install([
  {:jason, "~> 1.4"},
  {:kino, "~> 0.9", override: true},
  {:youtube, github: "brooklinjazz/youtube"},
  {:hidden_cell, github: "brooklinjazz/hidden_cell"}
])

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Anagram

Two words that contain all the same letters are anagrams. For example bored and robed are anagrams.

• Create a function anagram?/2 which determines if two strings are anagrams.
• Create a function filter_anagrams/2 which filters a list based on if they are anagrams of a provided string.

Solution Example

defmodule Anagram do
  def anagram?(word, possible_anagram) do
    sort_string(word) == sort_string(possible_anagram)
  end

  def filter_anagrams(words, string) do
    Enum.filter(words, fn word -> anagram?(word, string) end)
  end

  defp sort_string(string) do
    String.split(string, "", trim: true) |> Enum.sort() |> Enum.join()
  end
end

defmodule Anagram do
  @moduledoc """
  Documentation for `Anagram`.
  """

  @doc """
  Determine if two strings are anagrams.

  ## Examples

    iex> Anagram.anagram?("abc", "bac")
    true

    iex> Anagram.anagram?("sit", "its")
    true

    iex> Anagram.anagram?("cats", "dogs")
    false

    iex> Anagram.anagram?("robed", "bored")
    true
  """

  def sort_string(string) do
    String.split(string, "", trim: true)
      |> Enum.sort()
      |> Enum.join()
  end
  
  def anagram?(word, possible_anagram) do
    sort_string(word) === sort_string(possible_anagram)
  end

  @doc """
  Filter anagrams.

  ## Examples

    iex> Anagram.filter_anagrams(["abc", "bca", "abcd", "cat"], "bac")
    ["abc", "bca"]

    iex> Anagram.filter_anagrams(["rams", "mars", "arms", "alarms"], "arms")
    ["rams", "mars", "arms"]

    iex> Anagram.filter_anagrams(["stop"], "go")
    []
  """
  def filter_anagrams(word_list, anagram) do
    Enum.filter(word_list, fn x -> anagram?(x, anagram) end)
  end
end

Bonus: Anagram Solver

Given a string, return all possible permutations of the string to return a list of potential anagrams.

This is a HARD challenge. Move on to regular exercises before attempting this.

defmodule AnagramSolver do
  @doc """
  Return a list of all string permutations to solve for all anagrams.

  ## Examples

    iex> AnagramSolver.solve("a")
    ["a"]

    iex> AnagramSolver.solve("ab")
    ["ab", "ba"]

    iex> AnagramSolver.solve("abc")
    ["abc", "acb", "bac", "bca", "cab", "cba"]
  """
  def solve(string) do
  end
end

Commit Your Progress

DockYard Academy now recommends you use the latest Release rather than forking or cloning our repository.

Run git status to ensure there are no undesirable changes. Then run the following in your command line from the curriculum folder to commit your progress.

$ git add .
$ git commit -m "finish Anagram exercise"
$ git push

We’re proud to offer our open-source curriculum free of charge for anyone to learn from at their own pace.

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