pig-latin
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{
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"authors": [
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"DoggettCK"
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],
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"contributors": [
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"alarregoity",
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"angelikatyborska",
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"Cohen-Carlisle",
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"devonestes",
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"moxley",
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"neenjaw",
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"sotojuan"
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],
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"files": {
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"solution": [
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"lib/pig_latin.ex"
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],
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"test": [
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"test/pig_latin_test.exs"
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],
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"example": [
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".meta/example.ex"
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]
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},
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"blurb": "Implement a program that translates from English to Pig Latin.",
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"source": "The Pig Latin exercise at Test First Teaching by Ultrasaurus",
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"source_url": "https://github.com/ultrasaurus/test-first-teaching/blob/master/learn_ruby/pig_latin/"
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}
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{"track":"elixir","exercise":"pig-latin","id":"3bcf481d20874254afa072bd2aabe30d","url":"https://exercism.org/tracks/elixir/exercises/pig-latin","handle":"negrienko","is_requester":true,"auto_approve":false}
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# Used by "mix format"
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[
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inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
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]
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# The directory Mix will write compiled artifacts to.
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/_build/
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# If you run "mix test --cover", coverage assets end up here.
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/cover/
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# The directory Mix downloads your dependencies sources to.
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/deps/
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# Where third-party dependencies like ExDoc output generated docs.
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/doc/
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# Ignore .fetch files in case you like to edit your project deps locally.
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/.fetch
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# If the VM crashes, it generates a dump, let's ignore it too.
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erl_crash.dump
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# Also ignore archive artifacts (built via "mix archive.build").
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*.ez
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# Ignore package tarball (built via "mix hex.build").
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pig_latin-*.tar
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# Help
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## Running the tests
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From the terminal, change to the base directory of the exercise then execute the tests with:
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```bash
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$ mix test
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```
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This will execute the test file found in the `test` subfolder -- a file ending in `_test.exs`
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Documentation:
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* [`mix test` - Elixir's test execution tool](https://hexdocs.pm/mix/Mix.Tasks.Test.html)
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* [`ExUnit` - Elixir's unit test library](https://hexdocs.pm/ex_unit/ExUnit.html)
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## Pending tests
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In test suites of practice exercises, all but the first test have been tagged to be skipped.
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Once you get a test passing, you can unskip the next one by commenting out the relevant `@tag :pending` with a `#` symbol.
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For example:
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```elixir
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# @tag :pending
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test "shouting" do
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assert Bob.hey("WATCH OUT!") == "Whoa, chill out!"
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end
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```
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If you wish to run all tests at once, you can include all skipped test by using the `--include` flag on the `mix test` command:
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```bash
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$ mix test --include pending
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```
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Or, you can enable all the tests by commenting out the `ExUnit.configure` line in the file `test/test_helper.exs`.
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```elixir
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# ExUnit.configure(exclude: :pending, trace: true)
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```
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## Useful `mix test` options
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* `test/<FILE>.exs:LINENUM` - runs only a single test, the test from `<FILE>.exs` whose definition is on line `LINENUM`
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* `--failed` - runs only tests that failed the last time they ran
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* `--max-failures` - the suite stops evaluating tests when this number of test failures
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is reached
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* `--seed 0` - disables randomization so the tests in a single file will always be ran
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in the same order they were defined in
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## Submitting your solution
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You can submit your solution using the `exercism submit lib/pig_latin.ex` command.
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This command will upload your solution to the Exercism website and print the solution page's URL.
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It's possible to submit an incomplete solution which allows you to:
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- See how others have completed the exercise
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- Request help from a mentor
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## Need to get help?
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If you'd like help solving the exercise, check the following pages:
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- The [Elixir track's documentation](https://exercism.org/docs/tracks/elixir)
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- The [Elixir track's programming category on the forum](https://forum.exercism.org/c/programming/elixir)
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- [Exercism's programming category on the forum](https://forum.exercism.org/c/programming/5)
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- The [Frequently Asked Questions](https://exercism.org/docs/using/faqs)
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Should those resources not suffice, you could submit your (incomplete) solution to request mentoring.
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If you're stuck on something, it may help to look at some of the [available resources](https://exercism.org/docs/tracks/elixir/resources) out there where answers might be found.
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# Pig Latin
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Welcome to Pig Latin on Exercism's Elixir Track.
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If you need help running the tests or submitting your code, check out `HELP.md`.
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## Introduction
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Your parents have challenged you and your sibling to a game of two-on-two basketball.
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Confident they'll win, they let you score the first couple of points, but then start taking over the game.
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Needing a little boost, you start speaking in [Pig Latin][pig-latin], which is a made-up children's language that's difficult for non-children to understand.
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This will give you the edge to prevail over your parents!
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[pig-latin]: https://en.wikipedia.org/wiki/Pig_latin
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## Instructions
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Your task is to translate text from English to Pig Latin.
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The translation is defined using four rules, which look at the pattern of vowels and consonants at the beginning of a word.
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These rules look at each word's use of vowels and consonants:
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- vowels: the letters `a`, `e`, `i`, `o`, and `u`
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- consonants: the other 21 letters of the English alphabet
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## Rule 1
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If a word begins with a vowel, or starts with `"xr"` or `"yt"`, add an `"ay"` sound to the end of the word.
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For example:
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- `"apple"` -> `"appleay"` (starts with vowel)
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- `"xray"` -> `"xrayay"` (starts with `"xr"`)
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- `"yttria"` -> `"yttriaay"` (starts with `"yt"`)
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## Rule 2
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If a word begins with a one or more consonants, first move those consonants to the end of the word and then add an `"ay"` sound to the end of the word.
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For example:
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- `"pig"` -> `"igp"` -> `"igpay"` (starts with single consonant)
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- `"chair"` -> `"airch"` -> `"airchay"` (starts with multiple consonants)
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- `"thrush"` -> `"ushthr"` -> `"ushthray"` (starts with multiple consonants)
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## Rule 3
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If a word starts with zero or more consonants followed by `"qu"`, first move those consonants (if any) and the `"qu"` part to the end of the word, and then add an `"ay"` sound to the end of the word.
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For example:
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- `"quick"` -> `"ickqu"` -> `"ay"` (starts with `"qu"`, no preceding consonants)
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- `"square"` -> `"aresqu"` -> `"aresquay"` (starts with one consonant followed by `"qu`")
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## Rule 4
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If a word starts with one or more consonants followed by `"y"`, first move the consonants preceding the `"y"`to the end of the word, and then add an `"ay"` sound to the end of the word.
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Some examples:
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- `"my"` -> `"ym"` -> `"ymay"` (starts with single consonant followed by `"y"`)
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- `"rhythm"` -> `"ythmrh"` -> `"ythmrhay"` (starts with multiple consonants followed by `"y"`)
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## Source
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### Created by
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- @DoggettCK
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### Contributed to by
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- @alarregoity
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- @angelikatyborska
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- @Cohen-Carlisle
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- @devonestes
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- @moxley
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- @neenjaw
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- @sotojuan
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### Based on
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The Pig Latin exercise at Test First Teaching by Ultrasaurus - https://github.com/ultrasaurus/test-first-teaching/blob/master/learn_ruby/pig_latin/
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defmodule PigLatin do
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@doc """
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Given a `phrase`, translate it a word at a time to Pig Latin.
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"""
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@vowels ~w(a e i o u)
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@spec translate(phrase :: String.t()) :: String.t()
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def translate(phrase) do
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phrase
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|> String.split()
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|> Enum.map(&String.graphemes/1)
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|> Enum.map(&translate_word/1)
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|> Enum.join(" ")
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end
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@spec translate_word(word :: [String.t()]) :: String.t()
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defp translate_word(["q", "u" | rest]), do: rest ++ ~w(quay)
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defp translate_word(["x", "r" | _rest] = word), do: ay(word)
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defp translate_word(["y", "t" | _rest] = word), do: ay(word)
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defp translate_word([hd | _rest] = word) when hd in @vowels, do: ay(word)
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defp translate_word([hd, x | _rest] = word) when hd in ~w(x y) and x not in @vowels, do: ay(word)
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defp translate_word([hd | rest]), do: translate_word(rest ++ [hd])
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@spec ay(word :: [String.t()]) :: [String.t()]
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defp ay(list), do: list ++ ~w(ay)
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end
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defmodule PigLatin.MixProject do
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use Mix.Project
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def project do
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[
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app: :pig_latin,
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version: "0.1.0",
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# elixir: "~> 1.8",
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start_permanent: Mix.env() == :prod,
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deps: deps()
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]
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end
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# Run "mix help compile.app" to learn about applications.
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def application do
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[
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extra_applications: [:logger]
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]
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end
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# Run "mix help deps" to learn about dependencies.
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defp deps do
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[
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# {:dep_from_hexpm, "~> 0.3.0"},
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# {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
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]
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end
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end
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defmodule PigLatinTest do
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use ExUnit.Case
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describe "ay is added to words that start with vowels" do
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test "word beginning with a" do
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assert PigLatin.translate("apple") == "appleay"
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end
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test "word beginning with e" do
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assert PigLatin.translate("ear") == "earay"
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end
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test "word beginning with i" do
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assert PigLatin.translate("igloo") == "iglooay"
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end
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test "word beginning with o" do
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assert PigLatin.translate("object") == "objectay"
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end
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test "word beginning with u" do
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assert PigLatin.translate("under") == "underay"
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end
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test "word beginning with a vowel and followed by a qu" do
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assert PigLatin.translate("equal") == "equalay"
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end
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end
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describe "first letter and ay are moved to the end of words that start with consonants" do
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test "word beginning with p" do
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assert PigLatin.translate("pig") == "igpay"
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end
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test "word beginning with k" do
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assert PigLatin.translate("koala") == "oalakay"
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end
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test "word beginning with x" do
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assert PigLatin.translate("xenon") == "enonxay"
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end
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test "word beginning with q without a following u" do
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assert PigLatin.translate("qat") == "atqay"
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end
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end
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describe "some letter clusters are treated like a single consonant" do
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test "word beginning with ch" do
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assert PigLatin.translate("chair") == "airchay"
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end
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test "word beginning with qu" do
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assert PigLatin.translate("queen") == "eenquay"
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end
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test "word beginning with qu and a preceding consonant" do
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assert PigLatin.translate("square") == "aresquay"
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end
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test "word beginning with th" do
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assert PigLatin.translate("therapy") == "erapythay"
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end
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test "word beginning with thr" do
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assert PigLatin.translate("thrush") == "ushthray"
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end
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test "word beginning with sch" do
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assert PigLatin.translate("school") == "oolschay"
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end
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end
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describe "some letter clusters are treated like a single vowel" do
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test "word beginning with y, followed by a consonant" do
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assert PigLatin.translate("yttria") == "yttriaay"
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end
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test "word beginning with xr" do
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assert PigLatin.translate("xray") == "xrayay"
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end
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end
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describe "position of y in a word determines if it is a consonant or a vowel" do
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test "y is treated like a consonant at the beginning of a word" do
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assert PigLatin.translate("yellow") == "ellowyay"
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end
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test "y is treated like a vowel at the end of a consonant cluster" do
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assert PigLatin.translate("rhythm") == "ythmrhay"
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end
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test "y as second letter in two letter word" do
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assert PigLatin.translate("my") == "ymay"
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end
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end
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describe "phrases are translated" do
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test "a whole phrase" do
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assert PigLatin.translate("quick fast run") == "ickquay astfay unray"
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end
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end
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end
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ExUnit.start()
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ExUnit.configure(exclude: :pending, trace: true)
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