proverb
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{
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"authors": [
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"jiegillet"
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],
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"contributors": [
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"angelikatyborska"
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],
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"files": {
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"solution": [
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"lib/proverb.ex"
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],
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"test": [
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"test/proverb_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": "For want of a horseshoe nail, a kingdom was lost, or so the saying goes. Output the full text of this proverbial rhyme.",
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"source": "Wikipedia",
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"source_url": "https://en.wikipedia.org/wiki/For_Want_of_a_Nail"
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}
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{"track":"elixir","exercise":"proverb","id":"ea1c76c464144259a45e86a6fa8b920b","url":"https://exercism.org/tracks/elixir/exercises/proverb","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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proverb-*.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/proverb.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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# Proverb
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Welcome to Proverb 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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## Instructions
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For want of a horseshoe nail, a kingdom was lost, or so the saying goes.
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Given a list of inputs, generate the relevant proverb.
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For example, given the list `["nail", "shoe", "horse", "rider", "message", "battle", "kingdom"]`, you will output the full text of this proverbial rhyme:
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```text
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For want of a nail the shoe was lost.
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For want of a shoe the horse was lost.
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For want of a horse the rider was lost.
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For want of a rider the message was lost.
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For want of a message the battle was lost.
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For want of a battle the kingdom was lost.
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And all for the want of a nail.
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```
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Note that the list of inputs may vary; your solution should be able to handle lists of arbitrary length and content.
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No line of the output text should be a static, unchanging string; all should vary according to the input given.
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## Source
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### Created by
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- @jiegillet
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### Contributed to by
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- @angelikatyborska
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### Based on
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Wikipedia - https://en.wikipedia.org/wiki/For_Want_of_a_Nail
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defmodule Proverb do
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@doc """
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Generate a proverb from a list of strings.
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"""
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@spec recite(strings :: [String.t()]) :: String.t()
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def recite([]), do: ""
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def recite([one]), do: first_in_the_end(one)
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def recite([head | tail]), do: Enum.join([first(head), recite_proverb(tail), first_in_the_end(head)])
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defp recite_proverb([last]), do: last(last)
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defp recite_proverb([middle | tail]), do: middle(middle) <> " " <> recite_proverb(tail)
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defp first(first), do: "For want of a #{first} "
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defp middle(middle), do: "the #{middle} was lost.\nFor want of a #{middle}"
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defp last(last), do: "the #{last} was lost.\n"
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defp first_in_the_end(first), do: "And all for the want of a #{first}.\n"
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end
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defmodule Proverb.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: :proverb,
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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 ProverbTest do
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use ExUnit.Case
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test "zero pieces" do
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strings = []
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output = Proverb.recite(strings)
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expected = ""
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assert output == expected
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end
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test "one piece" do
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strings = ["nail"]
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output = Proverb.recite(strings)
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expected = """
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And all for the want of a nail.
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"""
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assert output == expected
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end
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test "two pieces" do
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strings = ["nail", "shoe"]
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output = Proverb.recite(strings)
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expected = """
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For want of a nail the shoe was lost.
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And all for the want of a nail.
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"""
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assert output == expected
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end
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test "three pieces" do
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strings = ["nail", "shoe", "horse"]
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output = Proverb.recite(strings)
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expected = """
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For want of a nail the shoe was lost.
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For want of a shoe the horse was lost.
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And all for the want of a nail.
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"""
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assert output == expected
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end
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test "full proverb" do
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strings = ["nail", "shoe", "horse", "rider", "message", "battle", "kingdom"]
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output = Proverb.recite(strings)
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expected = """
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For want of a nail the shoe was lost.
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For want of a shoe the horse was lost.
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For want of a horse the rider was lost.
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For want of a rider the message was lost.
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For want of a message the battle was lost.
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For want of a battle the kingdom was lost.
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And all for the want of a nail.
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"""
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assert output == expected
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end
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test "four pieces modernized" do
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strings = ["pin", "gun", "soldier", "battle"]
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output = Proverb.recite(strings)
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expected = """
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For want of a pin the gun was lost.
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For want of a gun the soldier was lost.
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For want of a soldier the battle was lost.
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And all for the want of a pin.
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"""
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assert output == expected
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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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