chessboard

elixir/chessboard/.exercism/config.json

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+{
+  "authors": [
+    "angelikatyborska"
+  ],
+  "contributors": [
+    "neenjaw"
+  ],
+  "files": {
+    "solution": [
+      "lib/chessboard.ex"
+    ],
+    "test": [
+      "test/chessboard_test.exs"
+    ],
+    "exemplar": [
+      ".meta/exemplar.ex"
+    ]
+  },
+  "language_versions": ">=1.10",
+  "blurb": "Learn about ranges by generating a chessboard."
+}

elixir/chessboard/.exercism/metadata.json

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+{"track":"elixir","exercise":"chessboard","id":"639c84f70f71467b9140bcfcb8a192d4","url":"https://exercism.org/tracks/elixir/exercises/chessboard","handle":"negrienko","is_requester":true,"auto_approve":false}

elixir/chessboard/.formatter.exs

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

elixir/chessboard/.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").
+match_binary-*.tar
+

elixir/chessboard/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/chessboard.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/chessboard/HINTS.md

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+# Hints
+
+## General
+
+- Read the official documentation for [ranges][range].
+
+## 1. Define the rank range
+
+- There is a [special operator][range-creation-operator] for creating ranges.
+
+## 2. Define the file range
+
+- There is a [special operator][range-creation-operator] for creating ranges.
+- There is a [special syntax][unicode-code-points] to write a character code point without explicitly knowing its value.
+
+## 3. Transform the rank range into a list of ranks
+
+- Ranges implement the `Enumerable` protocol.
+- There is a [built-in function][enum-to-list] to change an enumerable data structure to a list.
+
+## 4. Transform the file range into a list of files
+
+- Ranges implement the `Enumerable` protocol.
+- There is a [built-in function][enum-map] to change an enumerable data structure to a list while modifying its elements.
+- The [bitstring special form][bitstring-special-form] can be used to turn a code point into a string.
+
+[range]: https://hexdocs.pm/elixir/Range.html
+[range-creation-operator]: https://hexdocs.pm/elixir/Kernel.html#../2
+[unicode-code-points]: https://hexdocs.pm/elixir/syntax-reference.html#integers-in-other-bases-and-unicode-code-points
+[enum-to-list]: https://hexdocs.pm/elixir/Enum.html#to_list/1
+[enum-map]: https://hexdocs.pm/elixir/Enum.html#map/2
+[bitstring-special-form]: https://hexdocs.pm/elixir/Kernel.SpecialForms.html#%3C%3C%3E%3E/1

elixir/chessboard/README.md

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+# Chessboard
+
+Welcome to Chessboard on Exercism's Elixir Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+If you get stuck on the exercise, check out `HINTS.md`, but try and solve it without using those first :)
+
+## Introduction
+
+## Ranges
+
+Ranges represent a sequence of one or many consecutive integers. They are created by connecting two integers with `..`.
+
+```elixir
+1..5
+```
+
+Ranges can be ascending or descending. They are always inclusive of the first and last values.
+
+A range implements the _Enumerable protocol_, which means functions in the `Enum` module can be used to work with ranges.
+
+## Instructions
+
+As a chess enthusiast, you would like to write your own version of the game. Yes, there maybe plenty of implementations of chess available online already, but yours will be unique!
+
+But before you can let your imagination run wild, you need to take care of the basics. Let's start by generating the board.
+
+Each square of the chessboard is identified by a letter-number pair. The vertical columns of squares, called files, are labeled A through H. The horizontal rows of squares, called ranks, are numbered 1 to 8.
+
+## 1. Define the rank range
+
+Implement the `rank_range/0` function. It should return a range of integers, from 1 to 8.
+
+```elixir
+Chessboard.rank_range()
+```
+
+## 2. Define the file range
+
+Implement the `file_range/0` function. It should return a range of integers, from the code point of the uppercase letter A, to the code point of the uppercase letter H.
+
+```elixir
+Chessboard.file_range()
+```
+
+## 3. Transform the rank range into a list of ranks
+
+Implement the `ranks/0` function. It should return a list of integers, from 1 to 8. Do not write the list by hand, generate it from the range returned by the `rank_range/0` function.
+
+```elixir
+Chessboard.ranks()
+# => [1, 2, 3, 4, 5, 6, 7, 8]
+```
+
+## 4. Transform the file range into a list of files
+
+Implement the `files/0` function. It should return a list of letters (strings), from "A" to "H". Do not write the list by hand, generate it from the range returned by the `file_range/0` function.
+
+```elixir
+Chessboard.files()
+# => ["A", "B", "C", "D", "E", "F", "G", "H"]
+```
+
+## Source
+
+### Created by
+
+- @angelikatyborska
+
+### Contributed to by
+
+- @neenjaw

elixir/chessboard/lib/chessboard.ex

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+defmodule Chessboard do
+  def rank_range, do: 1..8
+  def file_range, do: ?A..?H
+  def ranks, do: rank_range() |> Enum.to_list
+  def files, do: file_range() |> Enum.map(&(<<&1>>))
+end

elixir/chessboard/mix.exs

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+defmodule Chessboard.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :chessboard,
+      version: "0.1.0",
+      # elixir: "~> 1.10",
+      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/chessboard/test/chessboard_test.exs

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+defmodule ChessboardTest do
+  use ExUnit.Case
+
+  @tag task_id: 1
+  test "rank_range is a range from 1 to 8" do
+    assert Chessboard.rank_range() == 1..8
+  end
+
+  @tag task_id: 2
+  test "file_range is a range from ?A to ?H" do
+    assert Chessboard.file_range() == ?A..?H
+  end
+
+  @tag task_id: 3
+  test "ranks is a list of integers from 1 to 8" do
+    assert Chessboard.ranks() == [1, 2, 3, 4, 5, 6, 7, 8]
+  end
+
+  @tag task_id: 4
+  test "files is a list of letters (strings) from A to H" do
+    assert Chessboard.files() == ["A", "B", "C", "D", "E", "F", "G", "H"]
+  end
+end

elixir/chessboard/test/test_helper.exs

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+ExUnit.start()
+ExUnit.configure(exclude: :pending, trace: true, seed: 0)