word_count

elixir/word-count/.exercism/config.json

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+{
+  "authors": [
+    "rubysolo"
+  ],
+  "contributors": [
+    "andrewsardone",
+    "angelikatyborska",
+    "chriseyre2000",
+    "Cohen-Carlisle",
+    "dalexj",
+    "dantswain",
+    "devonestes",
+    "henrik",
+    "kronn",
+    "kytrinyx",
+    "lpil",
+    "lucasprag",
+    "MarcosX",
+    "neenjaw",
+    "parkerl",
+    "patrickgombert",
+    "sotojuan",
+    "Teapane",
+    "waiting-for-dev"
+  ],
+  "files": {
+    "solution": [
+      "lib/word_count.ex"
+    ],
+    "test": [
+      "test/word_count_test.exs"
+    ],
+    "example": [
+      ".meta/example.ex"
+    ]
+  },
+  "blurb": "Given a phrase, count the occurrences of each word in that phrase.",
+  "source": "This is a classic toy problem, but we were reminded of it by seeing it in the Go Tour."
+}

elixir/word-count/.exercism/metadata.json

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+{"track":"elixir","exercise":"word-count","id":"c8fad83593244f55a57afa42bc2f46cd","url":"https://exercism.org/tracks/elixir/exercises/word-count","handle":"negrienko","is_requester":true,"auto_approve":false}

elixir/word-count/.formatter.exs

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

elixir/word-count/.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").
+word_count-*.tar
+

elixir/word-count/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/word_count.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/word-count/README.md

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+# Word Count
+
+Welcome to Word Count on Exercism's Elixir Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Introduction
+
+You teach English as a foreign language to high school students.
+
+You've decided to base your entire curriculum on TV shows.
+You need to analyze which words are used, and how often they're repeated.
+
+This will let you choose the simplest shows to start with, and to gradually increase the difficulty as time passes.
+
+## Instructions
+
+Your task is to count how many times each word occurs in a subtitle of a drama.
+
+The subtitles from these dramas use only ASCII characters.
+
+The characters often speak in casual English, using contractions like _they're_ or _it's_.
+Though these contractions come from two words (e.g. _we are_), the contraction (_we're_) is considered a single word.
+
+Words can be separated by any form of punctuation (e.g. ":", "!", or "?") or whitespace (e.g. "\t", "\n", or " ").
+The only punctuation that does not separate words is the apostrophe in contractions.
+
+Numbers are considered words.
+If the subtitles say _It costs 100 dollars._ then _100_ will be its own word.
+
+Words are case insensitive.
+For example, the word _you_ occurs three times in the following sentence:
+
+> You come back, you hear me? DO YOU HEAR ME?
+
+The ordering of the word counts in the results doesn't matter.
+
+Here's an example that incorporates several of the elements discussed above:
+
+- simple words
+- contractions
+- numbers
+- case insensitive words
+- punctuation (including apostrophes) to separate words
+- different forms of whitespace to separate words
+
+`"That's the password: 'PASSWORD 123'!", cried the Special Agent.\nSo I fled.`
+
+The mapping for this subtitle would be:
+
+```text
+123: 1
+agent: 1
+cried: 1
+fled: 1
+i: 1
+password: 2
+so: 1
+special: 1
+that's: 1
+the: 2
+```
+
+## Source
+
+### Created by
+
+- @rubysolo
+
+### Contributed to by
+
+- @andrewsardone
+- @angelikatyborska
+- @chriseyre2000
+- @Cohen-Carlisle
+- @dalexj
+- @dantswain
+- @devonestes
+- @henrik
+- @kronn
+- @kytrinyx
+- @lpil
+- @lucasprag
+- @MarcosX
+- @neenjaw
+- @parkerl
+- @patrickgombert
+- @sotojuan
+- @Teapane
+- @waiting-for-dev
+
+### Based on
+
+This is a classic toy problem, but we were reminded of it by seeing it in the Go Tour.

elixir/word-count/lib/word_count.ex

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+defmodule WordCount do
+  @doc """
+  Count the number of words in the sentence.
+
+  Words are compared case-insensitively.
+  """
+  @spec count(String.t()) :: map
+  def count(sentence) do
+    sentence
+    |> String.split(~r/[\s,.:!?_]+/, trim: true)
+    |> Enum.reject(&String.match?(&1, ~r/[&@$%^]+/))
+    |> Enum.map(&String.trim(&1, "'"))
+    |> Enum.reduce(%{}, fn word, acc ->
+      Map.update(acc, String.downcase(word), 1, &(&1 + 1))
+    end)
+  end
+end

elixir/word-count/mix.exs

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+defmodule WordCount.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :word_count,
+      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/word-count/test/test_helper.exs

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

elixir/word-count/test/word_count_test.exs

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+defmodule WordCountTest do
+  use ExUnit.Case
+
+  test "count one word" do
+    assert WordCount.count("word") == %{"word" => 1}
+  end
+
+  test "count one of each word" do
+    expected = %{"one" => 1, "of" => 1, "each" => 1}
+    assert WordCount.count("one of each") == expected
+  end
+
+  test "multiple occurrences of a word" do
+    expected = %{"one" => 1, "fish" => 4, "two" => 1, "red" => 1, "blue" => 1}
+    assert WordCount.count("one fish two fish red fish blue fish") == expected
+  end
+
+  test "handles cramped lists" do
+    expected = %{"one" => 1, "two" => 1, "three" => 1}
+    assert WordCount.count("one,two,three") == expected
+  end
+
+  test "handles expanded lists" do
+    expected = %{"one" => 1, "two" => 1, "three" => 1}
+    assert WordCount.count("one,\ntwo,\nthree") == expected
+  end
+
+  test "ignore punctuation" do
+    expected = %{"car" => 1, "carpet" => 1, "as" => 1, "java" => 1, "javascript" => 1}
+    assert WordCount.count("car : carpet as java : javascript!!&@$%^&") == expected
+  end
+
+  test "include numbers" do
+    expected = %{"testing" => 2, "1" => 1, "2" => 1}
+    assert WordCount.count("testing, 1, 2 testing") == expected
+  end
+
+  test "ignore underscores" do
+    expected = %{"two" => 1, "words" => 1}
+    assert WordCount.count("two_words") == expected
+  end
+
+  test "normalize case" do
+    expected = %{"go" => 3, "stop" => 2}
+    assert WordCount.count("go Go GO Stop stop") == expected
+  end
+
+  test "with apostrophes" do
+    expected = %{
+      "first" => 1,
+      "don't" => 2,
+      "laugh" => 1,
+      "then" => 1,
+      "cry" => 1,
+      "you're" => 1,
+      "getting" => 1,
+      "it" => 1
+    }
+
+    assert WordCount.count("First: don't laugh. Then: don't cry. You're getting it.") == expected
+  end
+
+  test "with quotations" do
+    expected = %{"joe" => 1, "can't" => 1, "tell" => 1, "between" => 1, "large" => 2, "and" => 1}
+    assert WordCount.count("Joe can't tell between 'large' and large.") == expected
+  end
+
+  test "with quotations at the end and beginning of the sentence" do
+    expected = %{"venti" => 1, "in" => 1, "italian" => 1, "means" => 1, "twenty" => 1}
+    assert WordCount.count("'venti' in Italian means 'twenty'") == expected
+  end
+
+  test "substrings from the beginning" do
+    expected = %{
+      "joe" => 1,
+      "can't" => 1,
+      "tell" => 1,
+      "between" => 1,
+      "app" => 1,
+      "apple" => 1,
+      "and" => 1,
+      "a" => 1
+    }
+
+    assert WordCount.count("Joe can't tell between app, apple and a.") == expected
+  end
+
+  test "multiple spaces not detected as a word" do
+    expected = %{"multiple" => 1, "whitespaces" => 1}
+    assert WordCount.count(" multiple   whitespaces") == expected
+  end
+
+  test "alternating word separators not detected as a word" do
+    expected = %{"one" => 1, "two" => 1, "three" => 1}
+    assert WordCount.count(",\n,one,\n ,two \n 'three'") == expected
+  end
+
+  test "quotation for word with apostrophe" do
+    expected = %{"can" => 1, "can't" => 2}
+    assert WordCount.count("can, can't, 'can't'") == expected
+  end
+end