space_age
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{
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"authors": [
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"rubysolo"
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],
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"contributors": [
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"angelikatyborska",
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"Cohen-Carlisle",
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"dalexj",
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"devonestes",
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"henrik",
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"jinyeow",
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"koriroys",
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"kytrinyx",
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"lpil",
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"neenjaw",
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"parkerl",
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"pminten",
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"sotojuan",
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"Teapane",
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"waiting-for-dev"
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],
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"files": {
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"solution": [
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"lib/space_age.ex"
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],
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"test": [
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"test/space_age_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": "Given an age in seconds, calculate how old someone is in terms of a given planet's solar years.",
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"source": "Partially inspired by Chapter 1 in Chris Pine's online Learn to Program tutorial.",
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"source_url": "https://pine.fm/LearnToProgram/?Chapter=01"
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}
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{"track":"elixir","exercise":"space-age","id":"a5e01ddaed4e4e6187c5fa10c72075ab","url":"https://exercism.org/tracks/elixir/exercises/space-age","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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space_age-*.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/space_age.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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# Space Age
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Welcome to Space Age 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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Given an age in seconds, calculate how old someone would be on:
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- Mercury: orbital period 0.2408467 Earth years
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- Venus: orbital period 0.61519726 Earth years
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- Earth: orbital period 1.0 Earth years, 365.25 Earth days, or 31557600 seconds
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- Mars: orbital period 1.8808158 Earth years
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- Jupiter: orbital period 11.862615 Earth years
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- Saturn: orbital period 29.447498 Earth years
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- Uranus: orbital period 84.016846 Earth years
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- Neptune: orbital period 164.79132 Earth years
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So if you were told someone were 1,000,000,000 seconds old, you should
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be able to say that they're 31.69 Earth-years old.
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If you're wondering why Pluto didn't make the cut, go watch [this YouTube video][pluto-video].
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Note: The actual length of one complete orbit of the Earth around the sun is closer to 365.256 days (1 sidereal year).
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The Gregorian calendar has, on average, 365.2425 days.
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While not entirely accurate, 365.25 is the value used in this exercise.
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See [Year on Wikipedia][year] for more ways to measure a year.
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[pluto-video]: https://www.youtube.com/watch?v=Z_2gbGXzFbs
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[year]: https://en.wikipedia.org/wiki/Year#Summary
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## Source
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### Created by
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- @rubysolo
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### Contributed to by
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- @angelikatyborska
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- @Cohen-Carlisle
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- @dalexj
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- @devonestes
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- @henrik
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- @jinyeow
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- @koriroys
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- @kytrinyx
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- @lpil
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- @neenjaw
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- @parkerl
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- @pminten
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- @sotojuan
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- @Teapane
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- @waiting-for-dev
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### Based on
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Partially inspired by Chapter 1 in Chris Pine's online Learn to Program tutorial. - https://pine.fm/LearnToProgram/?Chapter=01
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defmodule SpaceAge do
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@type planet ::
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:mercury
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| :venus
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| :earth
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| :mars
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| :jupiter
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| :saturn
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| :uranus
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| :neptune
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@planets ~w(mercury venus earth mars jupiter saturn uranus neptune)a
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defguardp is_planet(planet) when planet in @planets
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defp factor(:mercury), do: 0.2408467
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defp factor(:venus), do: 0.61519726
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defp factor(:earth), do: 1.0
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defp factor(:mars), do: 1.8808158
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defp factor(:jupiter), do: 11.862615
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defp factor(:saturn), do: 29.447498
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defp factor(:uranus), do: 84.016846
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defp factor(:neptune), do: 164.79132
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@doc """
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Return the number of years a person that has lived for 'seconds' seconds is
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aged on 'planet', or an error if 'planet' is not a planet.
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"""
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@spec age_on(planet, pos_integer) :: {:ok, float} | {:error, String.t()}
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def age_on(planet, seconds) when is_planet(planet),
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do: {:ok, seconds / (factor(planet) * 31_557_600)}
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def age_on(_planet, _seconds),
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do: {:error, "not a planet"}
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end
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defmodule SpaceAge.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: :space_age,
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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 SpaceAgeTest do
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use ExUnit.Case
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test "age on Earth" do
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input = 1_000_000_000
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{:ok, age} = SpaceAge.age_on(:earth, input)
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assert_in_delta 31.69, age, 0.005
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end
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test "age on Mercury" do
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input = 2_134_835_688
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{:ok, age} = SpaceAge.age_on(:earth, input)
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assert_in_delta 67.65, age, 0.005
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{:ok, age} = SpaceAge.age_on(:mercury, input)
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assert_in_delta 280.88, age, 0.005
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end
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test "age on Venus" do
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input = 189_839_836
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{:ok, age} = SpaceAge.age_on(:earth, input)
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assert_in_delta 6.02, age, 0.005
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{:ok, age} = SpaceAge.age_on(:venus, input)
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assert_in_delta 9.78, age, 0.005
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end
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test "age on Mars" do
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input = 2_129_871_239
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{:ok, age} = SpaceAge.age_on(:earth, input)
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assert_in_delta 67.49, age, 0.005
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{:ok, age} = SpaceAge.age_on(:mars, input)
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assert_in_delta 35.88, age, 0.005
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end
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test "age on Jupiter" do
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input = 901_876_382
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{:ok, age} = SpaceAge.age_on(:earth, input)
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assert_in_delta 28.58, age, 0.005
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{:ok, age} = SpaceAge.age_on(:jupiter, input)
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assert_in_delta 2.41, age, 0.005
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end
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test "age on Saturn" do
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input = 2_000_000_000
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{:ok, age} = SpaceAge.age_on(:earth, input)
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assert_in_delta 63.38, age, 0.005
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{:ok, age} = SpaceAge.age_on(:saturn, input)
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assert_in_delta 2.15, age, 0.005
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end
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test "age on Uranus" do
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input = 1_210_123_456
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{:ok, age} = SpaceAge.age_on(:earth, input)
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assert_in_delta 38.35, age, 0.005
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{:ok, age} = SpaceAge.age_on(:uranus, input)
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assert_in_delta 0.46, age, 0.005
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end
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test "age on Neptune" do
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input = 1_821_023_456
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{:ok, age} = SpaceAge.age_on(:earth, input)
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assert_in_delta 57.70, age, 0.005
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{:ok, age} = SpaceAge.age_on(:neptune, input)
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assert_in_delta 0.35, age, 0.005
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end
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test "invalid planet causes error" do
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input = 680_804_807
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assert SpaceAge.age_on(:sun, input) == {:error, "not a planet"}
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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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