From 833fe9c0f562f84e81213bd802182175093bf009 Mon Sep 17 00:00:00 2001 From: Danylo Negrienko Date: Wed, 20 Dec 2023 23:21:06 -0500 Subject: [PATCH] pop-count --- elixir/pop-count/.exercism/config.json | 19 ++++++ elixir/pop-count/.exercism/metadata.json | 1 + elixir/pop-count/.formatter.exs | 4 ++ elixir/pop-count/.gitignore | 24 ++++++++ elixir/pop-count/HELP.md | 75 ++++++++++++++++++++++++ elixir/pop-count/README.md | 71 ++++++++++++++++++++++ elixir/pop-count/lib/pop_count.ex | 51 ++++++++++++++++ elixir/pop-count/mix.exs | 28 +++++++++ elixir/pop-count/test/pop_count_test.exs | 29 +++++++++ elixir/pop-count/test/test_helper.exs | 2 + 10 files changed, 304 insertions(+) create mode 100644 elixir/pop-count/.exercism/config.json create mode 100644 elixir/pop-count/.exercism/metadata.json create mode 100644 elixir/pop-count/.formatter.exs create mode 100644 elixir/pop-count/.gitignore create mode 100644 elixir/pop-count/HELP.md create mode 100644 elixir/pop-count/README.md create mode 100644 elixir/pop-count/lib/pop_count.ex create mode 100644 elixir/pop-count/mix.exs create mode 100644 elixir/pop-count/test/pop_count_test.exs create mode 100644 elixir/pop-count/test/test_helper.exs diff --git a/elixir/pop-count/.exercism/config.json b/elixir/pop-count/.exercism/config.json new file mode 100644 index 0000000..7ad7ca7 --- /dev/null +++ b/elixir/pop-count/.exercism/config.json @@ -0,0 +1,19 @@ +{ + "authors": [ + "kahgoh" + ], + "files": { + "solution": [ + "lib/pop_count.ex" + ], + "test": [ + "test/pop_count_test.exs" + ], + "example": [ + ".meta/example.ex" + ] + }, + "blurb": "Help Eliud count the number of eggs in her chicken coop by counting the number of 1 bits in a binary representation.", + "source": "Christian Willner, Eric Willigers", + "source_url": "https://forum.exercism.org/t/new-exercise-suggestion-pop-count/7632/5" +} diff --git a/elixir/pop-count/.exercism/metadata.json b/elixir/pop-count/.exercism/metadata.json new file mode 100644 index 0000000..cc4e6df --- /dev/null +++ b/elixir/pop-count/.exercism/metadata.json @@ -0,0 +1 @@ +{"track":"elixir","exercise":"pop-count","id":"d2363c035a2748d9a3b9561ce18f0315","url":"https://exercism.org/tracks/elixir/exercises/pop-count","handle":"negrienko","is_requester":true,"auto_approve":false} \ No newline at end of file diff --git a/elixir/pop-count/.formatter.exs b/elixir/pop-count/.formatter.exs new file mode 100644 index 0000000..d2cda26 --- /dev/null +++ b/elixir/pop-count/.formatter.exs @@ -0,0 +1,4 @@ +# Used by "mix format" +[ + inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"] +] diff --git a/elixir/pop-count/.gitignore b/elixir/pop-count/.gitignore new file mode 100644 index 0000000..f655aa4 --- /dev/null +++ b/elixir/pop-count/.gitignore @@ -0,0 +1,24 @@ +# 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"). +isogram-*.tar + diff --git a/elixir/pop-count/HELP.md b/elixir/pop-count/HELP.md new file mode 100644 index 0000000..40b4b16 --- /dev/null +++ b/elixir/pop-count/HELP.md @@ -0,0 +1,75 @@ +# 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/.exs:LINENUM` - runs only a single test, the test from `.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/pop_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. \ No newline at end of file diff --git a/elixir/pop-count/README.md b/elixir/pop-count/README.md new file mode 100644 index 0000000..8decf36 --- /dev/null +++ b/elixir/pop-count/README.md @@ -0,0 +1,71 @@ +# Eliud's Eggs + +Welcome to Eliud's Eggs on Exercism's Elixir Track. +If you need help running the tests or submitting your code, check out `HELP.md`. + +## Introduction + +Your friend Eliud inherited a farm from her grandma Tigist. +Her granny was an inventor and had a tendency to build things in an overly complicated manner. +The chicken coop has a digital display showing an encoded number representing the positions of all eggs that could be picked up. + +Eliud is asking you to write a program that shows the actual number of eggs in the coop. + +The position information encoding is calculated as follows: + +1. Scan the potential egg-laying spots and mark down a `1` for an existing egg or a `0` for an empty spot. +2. Convert the number from binary to decimal. +3. Show the result on the display. + +Example 1: + +```text +Chicken Coop: + _ _ _ _ _ _ _ +|E| |E|E| | |E| + +Resulting Binary: + 1 0 1 1 0 0 1 + +Decimal number on the display: +89 + +Actual eggs in the coop: +4 +``` + +Example 2: + +```text +Chicken Coop: + _ _ _ _ _ _ _ _ +| | | |E| | | | | + +Resulting Binary: + 0 0 0 1 0 0 0 0 + +Decimal number on the display: +16 + +Actual eggs in the coop: +1 +``` + +## Instructions + +Your task is to count the number of 1 bits in the binary representation of a number. + +## Restrictions + +Keep your hands off that bit-count functionality provided by your standard library! +Solve this one yourself using other basic tools instead. + +## Source + +### Created by + +- @kahgoh + +### Based on + +Christian Willner, Eric Willigers - https://forum.exercism.org/t/new-exercise-suggestion-pop-count/7632/5 \ No newline at end of file diff --git a/elixir/pop-count/lib/pop_count.ex b/elixir/pop-count/lib/pop_count.ex new file mode 100644 index 0000000..1058170 --- /dev/null +++ b/elixir/pop-count/lib/pop_count.ex @@ -0,0 +1,51 @@ +defmodule PopCount do + @doc """ + Given the number, count the number of eggs. + """ + @spec egg_count(number :: integer()) :: non_neg_integer() + def egg_count(number) do + for(<>, do: bit) |> Enum.sum + end + + # @spec egg_count(number :: integer()) :: non_neg_integer() + # def egg_count(number) do + # result = + # number + # |> Integer.digits(2) + # |> Enum.reduce(%{binary: "", count: 0, coop: "|", length: 0}, &egg_counter/2) + + # """ + # Chicken Coop: + # #{String.duplicate(" _", result.length)} + # #{result.coop} + + # Resulting Binary: + # #{result.binary} + + # Decimal number on the display: + # #{number} + + # Actual eggs in the coop: + # #{result.count} + # """ + # |> IO.puts() + + + # result.count + # end + + # defp egg_counter(element, %{binary: binary, count: count, coop: coop, length: length} = _acc) do + # char = + # case element do + # 0 -> " " + # 1 -> "E" + # end + + # %{ + # coop: coop <> char <> "|", + # count: count + element, + # length: length + 1, + # binary: binary <> "#{element}" + # } + # end +end diff --git a/elixir/pop-count/mix.exs b/elixir/pop-count/mix.exs new file mode 100644 index 0000000..3f65937 --- /dev/null +++ b/elixir/pop-count/mix.exs @@ -0,0 +1,28 @@ +defmodule PopCount.MixProject do + use Mix.Project + + def project do + [ + app: :pop_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 diff --git a/elixir/pop-count/test/pop_count_test.exs b/elixir/pop-count/test/pop_count_test.exs new file mode 100644 index 0000000..7e0a3f6 --- /dev/null +++ b/elixir/pop-count/test/pop_count_test.exs @@ -0,0 +1,29 @@ +defmodule PopCountTest do + use ExUnit.Case + + describe "egg count" do + test "0 eggs" do + assert PopCount.egg_count(0) == 0 + end + + # @tag :pending + test "1 egg" do + assert PopCount.egg_count(16) == 1 + end + + # @tag :pending + test "4 eggs" do + assert PopCount.egg_count(89) == 4 + end + + # @tag :pending + test "13 eggs" do + assert PopCount.egg_count(2_000_000_000) == 13 + end + + # @tag :pending + test "100 eggs" do + assert PopCount.egg_count(1_267_650_600_228_229_401_496_703_205_375) == 100 + end + end +end diff --git a/elixir/pop-count/test/test_helper.exs b/elixir/pop-count/test/test_helper.exs new file mode 100644 index 0000000..35fc5bf --- /dev/null +++ b/elixir/pop-count/test/test_helper.exs @@ -0,0 +1,2 @@ +ExUnit.start() +ExUnit.configure(exclude: :pending, trace: true)