space_age

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Danil Negrienko 2024-06-29 03:38:25 -04:00
parent 6e761f7041
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{
"authors": [
"rubysolo"
],
"contributors": [
"angelikatyborska",
"Cohen-Carlisle",
"dalexj",
"devonestes",
"henrik",
"jinyeow",
"koriroys",
"kytrinyx",
"lpil",
"neenjaw",
"parkerl",
"pminten",
"sotojuan",
"Teapane",
"waiting-for-dev"
],
"files": {
"solution": [
"lib/space_age.ex"
],
"test": [
"test/space_age_test.exs"
],
"example": [
".meta/example.ex"
]
},
"blurb": "Given an age in seconds, calculate how old someone is in terms of a given planet's solar years.",
"source": "Partially inspired by Chapter 1 in Chris Pine's online Learn to Program tutorial.",
"source_url": "https://pine.fm/LearnToProgram/?Chapter=01"
}

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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"
[
inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
]

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elixir/space-age/.gitignore vendored Normal file
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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").
space_age-*.tar

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elixir/space-age/HELP.md Normal file
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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/space_age.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.

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# Space Age
Welcome to Space Age on Exercism's Elixir Track.
If you need help running the tests or submitting your code, check out `HELP.md`.
## Instructions
Given an age in seconds, calculate how old someone would be on:
- Mercury: orbital period 0.2408467 Earth years
- Venus: orbital period 0.61519726 Earth years
- Earth: orbital period 1.0 Earth years, 365.25 Earth days, or 31557600 seconds
- Mars: orbital period 1.8808158 Earth years
- Jupiter: orbital period 11.862615 Earth years
- Saturn: orbital period 29.447498 Earth years
- Uranus: orbital period 84.016846 Earth years
- Neptune: orbital period 164.79132 Earth years
So if you were told someone were 1,000,000,000 seconds old, you should
be able to say that they're 31.69 Earth-years old.
If you're wondering why Pluto didn't make the cut, go watch [this YouTube video][pluto-video].
Note: The actual length of one complete orbit of the Earth around the sun is closer to 365.256 days (1 sidereal year).
The Gregorian calendar has, on average, 365.2425 days.
While not entirely accurate, 365.25 is the value used in this exercise.
See [Year on Wikipedia][year] for more ways to measure a year.
[pluto-video]: https://www.youtube.com/watch?v=Z_2gbGXzFbs
[year]: https://en.wikipedia.org/wiki/Year#Summary
## Source
### Created by
- @rubysolo
### Contributed to by
- @angelikatyborska
- @Cohen-Carlisle
- @dalexj
- @devonestes
- @henrik
- @jinyeow
- @koriroys
- @kytrinyx
- @lpil
- @neenjaw
- @parkerl
- @pminten
- @sotojuan
- @Teapane
- @waiting-for-dev
### Based on
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
@type planet ::
:mercury
| :venus
| :earth
| :mars
| :jupiter
| :saturn
| :uranus
| :neptune
@planets ~w(mercury venus earth mars jupiter saturn uranus neptune)a
defguardp is_planet(planet) when planet in @planets
defp factor(:mercury), do: 0.2408467
defp factor(:venus), do: 0.61519726
defp factor(:earth), do: 1.0
defp factor(:mars), do: 1.8808158
defp factor(:jupiter), do: 11.862615
defp factor(:saturn), do: 29.447498
defp factor(:uranus), do: 84.016846
defp factor(:neptune), do: 164.79132
@doc """
Return the number of years a person that has lived for 'seconds' seconds is
aged on 'planet', or an error if 'planet' is not a planet.
"""
@spec age_on(planet, pos_integer) :: {:ok, float} | {:error, String.t()}
def age_on(planet, seconds) when is_planet(planet),
do: {:ok, seconds / (factor(planet) * 31_557_600)}
def age_on(_planet, _seconds),
do: {:error, "not a planet"}
end

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elixir/space-age/mix.exs Normal file
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defmodule SpaceAge.MixProject do
use Mix.Project
def project do
[
app: :space_age,
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

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defmodule SpaceAgeTest do
use ExUnit.Case
test "age on Earth" do
input = 1_000_000_000
{:ok, age} = SpaceAge.age_on(:earth, input)
assert_in_delta 31.69, age, 0.005
end
test "age on Mercury" do
input = 2_134_835_688
{:ok, age} = SpaceAge.age_on(:earth, input)
assert_in_delta 67.65, age, 0.005
{:ok, age} = SpaceAge.age_on(:mercury, input)
assert_in_delta 280.88, age, 0.005
end
test "age on Venus" do
input = 189_839_836
{:ok, age} = SpaceAge.age_on(:earth, input)
assert_in_delta 6.02, age, 0.005
{:ok, age} = SpaceAge.age_on(:venus, input)
assert_in_delta 9.78, age, 0.005
end
test "age on Mars" do
input = 2_129_871_239
{:ok, age} = SpaceAge.age_on(:earth, input)
assert_in_delta 67.49, age, 0.005
{:ok, age} = SpaceAge.age_on(:mars, input)
assert_in_delta 35.88, age, 0.005
end
test "age on Jupiter" do
input = 901_876_382
{:ok, age} = SpaceAge.age_on(:earth, input)
assert_in_delta 28.58, age, 0.005
{:ok, age} = SpaceAge.age_on(:jupiter, input)
assert_in_delta 2.41, age, 0.005
end
test "age on Saturn" do
input = 2_000_000_000
{:ok, age} = SpaceAge.age_on(:earth, input)
assert_in_delta 63.38, age, 0.005
{:ok, age} = SpaceAge.age_on(:saturn, input)
assert_in_delta 2.15, age, 0.005
end
test "age on Uranus" do
input = 1_210_123_456
{:ok, age} = SpaceAge.age_on(:earth, input)
assert_in_delta 38.35, age, 0.005
{:ok, age} = SpaceAge.age_on(:uranus, input)
assert_in_delta 0.46, age, 0.005
end
test "age on Neptune" do
input = 1_821_023_456
{:ok, age} = SpaceAge.age_on(:earth, input)
assert_in_delta 57.70, age, 0.005
{:ok, age} = SpaceAge.age_on(:neptune, input)
assert_in_delta 0.35, age, 0.005
end
test "invalid planet causes error" do
input = 680_804_807
assert SpaceAge.age_on(:sun, input) == {:error, "not a planet"}
end
end

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