all_your_base

elixir/all-your-base/.exercism/config.json

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+{
+  "authors": [
+    "ananthamapod"
+  ],
+  "contributors": [
+    "angelikatyborska",
+    "ChristianTovar",
+    "Cohen-Carlisle",
+    "devonestes",
+    "neenjaw",
+    "parkerl",
+    "sotojuan",
+    "ybod"
+  ],
+  "files": {
+    "solution": [
+      "lib/all_your_base.ex"
+    ],
+    "test": [
+      "test/all_your_base_test.exs"
+    ],
+    "example": [
+      ".meta/example.ex"
+    ]
+  },
+  "blurb": "Convert a number, represented as a sequence of digits in one base, to any other base."
+}

elixir/all-your-base/.exercism/metadata.json

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+{"track":"elixir","exercise":"all-your-base","id":"98d3bf453a6d4f1383988013aadb22c0","url":"https://exercism.org/tracks/elixir/exercises/all-your-base","handle":"negrienko","is_requester":true,"auto_approve":false}

elixir/all-your-base/.formatter.exs

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

elixir/all-your-base/.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").
+all_your_base-*.tar
+

elixir/all-your-base/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/all_your_base.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/all-your-base/README.md

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+# All Your Base
+
+Welcome to All Your Base on Exercism's Elixir Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Instructions
+
+Convert a number, represented as a sequence of digits in one base, to any other base.
+
+Implement general base conversion.
+Given a number in base **a**, represented as a sequence of digits, convert it to base **b**.
+
+## Note
+
+- Try to implement the conversion yourself.
+  Do not use something else to perform the conversion for you.
+
+## About [Positional Notation][positional-notation]
+
+In positional notation, a number in base **b** can be understood as a linear combination of powers of **b**.
+
+The number 42, _in base 10_, means:
+
+`(4 * 10^1) + (2 * 10^0)`
+
+The number 101010, _in base 2_, means:
+
+`(1 * 2^5) + (0 * 2^4) + (1 * 2^3) + (0 * 2^2) + (1 * 2^1) + (0 * 2^0)`
+
+The number 1120, _in base 3_, means:
+
+`(1 * 3^3) + (1 * 3^2) + (2 * 3^1) + (0 * 3^0)`
+
+I think you got the idea!
+
+_Yes. Those three numbers above are exactly the same. Congratulations!_
+
+[positional-notation]: https://en.wikipedia.org/wiki/Positional_notation
+
+## Source
+
+### Created by
+
+- @ananthamapod
+
+### Contributed to by
+
+- @angelikatyborska
+- @ChristianTovar
+- @Cohen-Carlisle
+- @devonestes
+- @neenjaw
+- @parkerl
+- @sotojuan
+- @ybod

elixir/all-your-base/lib/all_your_base.ex

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+defmodule AllYourBase do
+  @doc """
+  Given a number in input base, represented as a sequence of digits, converts it to output base,
+  or returns an error tuple if either of the bases are less than 2
+  """
+
+  @spec convert(list, integer, integer) :: {:ok, list} | {:error, String.t()}
+  def convert(_digits, input_base, _output_base) when input_base < 2,
+    do: {:error, "input base must be >= 2"}
+
+  def convert(_digits, _input_base, output_base) when output_base < 2,
+    do: {:error, "output base must be >= 2"}
+
+  def convert([0 | digits], input_base, output_base), do: convert(digits, input_base, output_base)
+
+  def convert(digits, input_base, output_base) do
+    unless Enum.all?(digits, &valid_digit?(&1, input_base)) do
+      {:error, "all digits must be >= 0 and < input base"}
+    else
+      result =
+          digits
+          |> Integer.undigits(input_base)
+          |> Integer.digits(output_base)
+
+        {:ok, result}
+    end
+  end
+
+  defp valid_digit?(digit, base) when digit >= 0 and digit < base, do: true
+  defp valid_digit?(_digit, _base), do: false
+end

elixir/all-your-base/mix.exs

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+defmodule AllYourBase.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :all_your_base,
+      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/all-your-base/test/all_your_base_test.exs

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+defmodule AllYourBaseTest do
+  use ExUnit.Case
+
+  test "convert single bit one to decimal" do
+    assert AllYourBase.convert([1], 2, 10) == {:ok, [1]}
+  end
+
+  # @tag :pending
+  test "convert binary to single decimal" do
+    assert AllYourBase.convert([1, 0, 1], 2, 10) == {:ok, [5]}
+  end
+
+  # @tag :pending
+  test "convert single decimal to binary" do
+    assert AllYourBase.convert([5], 10, 2) == {:ok, [1, 0, 1]}
+  end
+
+  # @tag :pending
+  test "convert binary to multiple decimal" do
+    assert AllYourBase.convert([1, 0, 1, 0, 1, 0], 2, 10) == {:ok, [4, 2]}
+  end
+
+  # @tag :pending
+  test "convert decimal to binary" do
+    assert AllYourBase.convert([4, 2], 10, 2) == {:ok, [1, 0, 1, 0, 1, 0]}
+  end
+
+  # @tag :pending
+  test "convert trinary to hexadecimal" do
+    assert AllYourBase.convert([1, 1, 2, 0], 3, 16) == {:ok, [2, 10]}
+  end
+
+  # @tag :pending
+  test "convert hexadecimal to trinary" do
+    assert AllYourBase.convert([2, 10], 16, 3) == {:ok, [1, 1, 2, 0]}
+  end
+
+  # @tag :pending
+  test "convert 15-bit integer" do
+    assert AllYourBase.convert([3, 46, 60], 97, 73) == {:ok, [6, 10, 45]}
+  end
+
+  # @tag :pending
+  test "convert empty list" do
+    assert AllYourBase.convert([], 2, 10) == {:ok, [0]}
+  end
+
+  # @tag :pending
+  test "convert single zero" do
+    assert AllYourBase.convert([0], 10, 2) == {:ok, [0]}
+  end
+
+  # @tag :pending
+  test "convert multiple zeros" do
+    assert AllYourBase.convert([0, 0, 0], 10, 2) == {:ok, [0]}
+  end
+
+  # @tag :pending
+  test "convert leading zeros" do
+    assert AllYourBase.convert([0, 6, 0], 7, 10) == {:ok, [4, 2]}
+  end
+
+  # @tag :pending
+  test "convert first base is one" do
+    assert AllYourBase.convert([0], 1, 10) == {:error, "input base must be >= 2"}
+  end
+
+  # @tag :pending
+  test "convert first base is zero" do
+    assert AllYourBase.convert([], 0, 10) == {:error, "input base must be >= 2"}
+  end
+
+  # @tag :pending
+  test "convert first base is negative" do
+    assert AllYourBase.convert([1], -2, 10) == {:error, "input base must be >= 2"}
+  end
+
+  # @tag :pending
+  test "convert negative digit" do
+    assert AllYourBase.convert([1, -1, 1, 0, 1, 0], 2, 10) ==
+             {:error, "all digits must be >= 0 and < input base"}
+  end
+
+  # @tag :pending
+  test "convert invalid positive digit" do
+    assert AllYourBase.convert([1, 2, 1, 0, 1, 0], 2, 10) ==
+             {:error, "all digits must be >= 0 and < input base"}
+  end
+
+  # @tag :pending
+  test "convert second base is one" do
+    assert AllYourBase.convert([1, 0, 1, 0, 1, 0], 2, 1) == {:error, "output base must be >= 2"}
+  end
+
+  # @tag :pending
+  test "convert second base is zero" do
+    assert AllYourBase.convert([7], 10, 0) == {:error, "output base must be >= 2"}
+  end
+
+  # @tag :pending
+  test "convert second base is negative" do
+    assert AllYourBase.convert([1], 2, -7) == {:error, "output base must be >= 2"}
+  end
+
+  # @tag :pending
+  test "convert both bases are negative" do
+    assert AllYourBase.convert([1], -2, -7) == {:error, "input base must be >= 2"}
+  end
+end

elixir/all-your-base/test/test_helper.exs

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