say

elixir/say/.exercism/config.json

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+{
+  "authors": [
+    "zporter"
+  ],
+  "contributors": [
+    "aifrak",
+    "amencarini",
+    "angelikatyborska",
+    "Cohen-Carlisle",
+    "devonestes",
+    "neenjaw",
+    "parkerl",
+    "sotojuan"
+  ],
+  "files": {
+    "solution": [
+      "lib/say.ex"
+    ],
+    "test": [
+      "test/say_test.exs"
+    ],
+    "example": [
+      ".meta/example.ex"
+    ]
+  },
+  "blurb": "Given a number from 0 to 999,999,999,999, spell out that number in English.",
+  "source": "A variation on the JavaRanch CattleDrive, Assignment 4",
+  "source_url": "https://coderanch.com/wiki/718804"
+}

elixir/say/.exercism/metadata.json

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+{"track":"elixir","exercise":"say","id":"85975fde45c04f6b8433af76568462eb","url":"https://exercism.org/tracks/elixir/exercises/say","handle":"negrienko","is_requester":true,"auto_approve":false}

elixir/say/.formatter.exs

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

elixir/say/.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").
+say-*.tar
+

elixir/say/HELP.md

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+# Help
+
+## Running the tests
+
+From the terminal, change to the base directory of the exercise then execute the tests with:
+
+```bash
+$ mix test
+```
+
+This will execute the test file found in the `test` subfolder -- a file ending in `_test.exs`
+
+Documentation:
+
+* [`mix test` - Elixir's test execution tool](https://hexdocs.pm/mix/Mix.Tasks.Test.html)
+* [`ExUnit` - Elixir's unit test library](https://hexdocs.pm/ex_unit/ExUnit.html)
+
+## Pending tests
+
+In test suites of practice exercises, all but the first test have been tagged to be skipped.
+
+Once you get a test passing, you can unskip the next one by commenting out the relevant `@tag :pending` with a `#` symbol.
+
+For example:
+
+```elixir
+# @tag :pending
+test "shouting" do
+  assert Bob.hey("WATCH OUT!") == "Whoa, chill out!"
+end
+```
+
+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:
+
+```bash
+$ mix test --include pending
+```
+
+Or, you can enable all the tests by commenting out the `ExUnit.configure` line in the file `test/test_helper.exs`.
+
+```elixir
+# ExUnit.configure(exclude: :pending, trace: true)
+```
+
+## Useful `mix test` options
+
+* `test/<FILE>.exs:LINENUM` - runs only a single test, the test from `<FILE>.exs` whose definition is on line `LINENUM`
+* `--failed` - runs only tests that failed the last time they ran
+* `--max-failures` - the suite stops evaluating tests when this number of test failures
+is reached
+* `--seed 0` - disables randomization so the tests in a single file will always be ran
+in the same order they were defined in
+
+## Submitting your solution
+
+You can submit your solution using the `exercism submit lib/say.ex` command.
+This command will upload your solution to the Exercism website and print the solution page's URL.
+
+It's possible to submit an incomplete solution which allows you to:
+
+- See how others have completed the exercise
+- Request help from a mentor
+
+## Need to get help?
+
+If you'd like help solving the exercise, check the following pages:
+
+- The [Elixir track's documentation](https://exercism.org/docs/tracks/elixir)
+- The [Elixir track's programming category on the forum](https://forum.exercism.org/c/programming/elixir)
+- [Exercism's programming category on the forum](https://forum.exercism.org/c/programming/5)
+- The [Frequently Asked Questions](https://exercism.org/docs/using/faqs)
+
+Should those resources not suffice, you could submit your (incomplete) solution to request mentoring.
+
+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.

elixir/say/README.md

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+# Say
+
+Welcome to Say on Exercism's Elixir Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Instructions
+
+Given a number from 0 to 999,999,999,999, spell out that number in English.
+
+## Step 1
+
+Handle the basic case of 0 through 99.
+
+If the input to the program is `22`, then the output should be `'twenty-two'`.
+
+Your program should complain loudly if given a number outside the blessed range.
+
+Some good test cases for this program are:
+
+- 0
+- 14
+- 50
+- 98
+- -1
+- 100
+
+### Extension
+
+If you're on a Mac, shell out to Mac OS X's `say` program to talk out loud.
+If you're on Linux or Windows, eSpeakNG may be available with the command `espeak`.
+
+## Step 2
+
+Implement breaking a number up into chunks of thousands.
+
+So `1234567890` should yield a list like 1, 234, 567, and 890, while the far simpler `1000` should yield just 1 and 0.
+
+## Step 3
+
+Now handle inserting the appropriate scale word between those chunks.
+
+So `1234567890` should yield `'1 billion 234 million 567 thousand 890'`
+
+The program must also report any values that are out of range.
+It's fine to stop at "trillion".
+
+## Step 4
+
+Put it all together to get nothing but plain English.
+
+`12345` should give `twelve thousand three hundred forty-five`.
+
+The program must also report any values that are out of range.
+
+## Source
+
+### Created by
+
+- @zporter
+
+### Contributed to by
+
+- @aifrak
+- @amencarini
+- @angelikatyborska
+- @Cohen-Carlisle
+- @devonestes
+- @neenjaw
+- @parkerl
+- @sotojuan
+
+### Based on
+
+A variation on the JavaRanch CattleDrive, Assignment 4 - https://coderanch.com/wiki/718804

elixir/say/lib/say.ex

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+defmodule Say do
+  @in_english_19 %{
+    1 => "one",
+    2 => "two",
+    3 => "three",
+    4 => "four",
+    5 => "five",
+    6 => "six",
+    7 => "seven",
+    8 => "eight",
+    9 => "nine",
+    10 => "ten",
+    11 => "eleven",
+    12 => "twelve",
+    13 => "thirteen",
+    14 => "fourteen",
+    15 => "fifteen",
+    16 => "sixteen",
+    17 => "seventeen",
+    18 => "eighteen",
+    19 => "nineteen"
+  }
+
+  @in_english_100 %{
+    2 => "twenty",
+    3 => "thirty",
+    4 => "forty",
+    5 => "fifty",
+    6 => "sixty",
+    7 => "seventy",
+    8 => "eighty",
+    9 => "ninety"
+  }
+
+  @doc """
+  Translate a positive integer into English.
+  """
+  @spec in_english(integer) :: {atom, String.t()}
+  def in_english(number) when number < 0 or number > 999_999_999_999,
+    do: {:error, "number is out of range"}
+
+  def in_english(0), do: {:ok, "zero"}
+
+  def in_english(number) do
+    {:ok,
+     number
+     |> Integer.digits()
+     |> Enum.reverse()
+     |> Enum.chunk_every(3)
+     |> Enum.with_index(fn element, index -> in_english_part(element, index) end)
+     |> Enum.reverse()
+     |> List.flatten()
+     |> Enum.reject(&is_nil/1)
+     |> Enum.join(" ")
+    }
+  end
+
+  @spec in_english_part([integer], integer) :: String.t()
+  defp in_english_part([0, 0, 0], _index), do: []
+  defp in_english_part(element, 3), do: [do_in_english_part(element) | ["billion"]]
+  defp in_english_part(element, 2), do: [do_in_english_part(element) | ["million"]]
+  defp in_english_part(element, 1), do: [do_in_english_part(element) | ["thousand"]]
+  defp in_english_part(element, 0), do: [do_in_english_part(element)]
+
+  defp do_in_english_part([d1, d2, d3]) when d3 != 0, do: [@in_english_19[d3], "hundred" | [do_in_english_part([d1, d2])]]
+  defp do_in_english_part([d1, d2, 0]), do: do_in_english_part([d1, d2])
+  defp do_in_english_part([d1, d2]) when d2 < 2, do: @in_english_19[Integer.undigits([d2, d1])]
+  defp do_in_english_part([0, d2]) when d2 > 1, do: @in_english_100[d2]
+
+  defp do_in_english_part([d1, d2]) when d2 > 1,
+    do: @in_english_100[d2] <> "-" <> @in_english_19[d1]
+
+  defp do_in_english_part([d1]), do: @in_english_19[d1]
+end

elixir/say/mix.exs

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+defmodule Say.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :say,
+      version: "0.1.0",
+      # elixir: "~> 1.8",
+      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

elixir/say/test/say_test.exs

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+defmodule SayTest do
+  use ExUnit.Case
+
+  test "zero" do
+    assert Say.in_english(0) == {:ok, "zero"}
+  end
+
+  test "one" do
+    assert Say.in_english(1) == {:ok, "one"}
+  end
+
+  test "fourteen" do
+    assert Say.in_english(14) == {:ok, "fourteen"}
+  end
+
+  test "twenty" do
+    assert Say.in_english(20) == {:ok, "twenty"}
+  end
+
+  test "twenty-two" do
+    assert Say.in_english(22) == {:ok, "twenty-two"}
+  end
+
+  test "thirty" do
+    assert Say.in_english(30) == {:ok, "thirty"}
+  end
+
+  test "ninety-nine" do
+    assert Say.in_english(99) == {:ok, "ninety-nine"}
+  end
+
+  test "one hundred" do
+    assert Say.in_english(100) == {:ok, "one hundred"}
+  end
+
+  test "one hundred twenty-three" do
+    assert Say.in_english(123) == {:ok, "one hundred twenty-three"}
+  end
+
+  test "two hundred" do
+    assert Say.in_english(200) == {:ok, "two hundred"}
+  end
+
+  test "nine hundred ninety-nine" do
+    assert Say.in_english(999) == {:ok, "nine hundred ninety-nine"}
+  end
+
+  test "one thousand" do
+    assert Say.in_english(1_000) == {:ok, "one thousand"}
+  end
+
+  test "one thousand two hundred thirty-four" do
+    assert Say.in_english(1_234) == {:ok, "one thousand two hundred thirty-four"}
+  end
+
+  test "one million" do
+    assert Say.in_english(1_000_000) == {:ok, "one million"}
+  end
+
+  test "one million two thousand three hundred forty-five" do
+    assert Say.in_english(1_002_345) == {:ok, "one million two thousand three hundred forty-five"}
+  end
+
+  test "one billion" do
+    assert Say.in_english(1_000_000_000) == {:ok, "one billion"}
+  end
+
+  test "a big number" do
+    assert Say.in_english(987_654_321_123) ==
+             {:ok,
+              "nine hundred eighty-seven billion six hundred fifty-four million three hundred twenty-one thousand one hundred twenty-three"}
+  end
+
+  test "numbers below zero are out of range" do
+    assert Say.in_english(-1) == {:error, "number is out of range"}
+  end
+
+  test "numbers above 999,999,999,999 are out of range" do
+    assert Say.in_english(1_000_000_000_000) == {:error, "number is out of range"}
+  end
+end

elixir/say/test/test_helper.exs

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+ExUnit.start()
+ExUnit.configure(exclude: :pending, trace: true)