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Danil Negrienko 2023-12-17 18:32:39 -05:00
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{
"authors": [
"rubysolo"
],
"contributors": [
"angelikatyborska",
"Cohen-Carlisle",
"dalexj",
"devonestes",
"glennular",
"jinyeow",
"korbin",
"kytrinyx",
"lpil",
"neenjaw",
"parkerl",
"sotojuan",
"Teapane",
"waiting-for-dev"
],
"files": {
"solution": [
"lib/year.ex"
],
"test": [
"test/year_test.exs"
],
"example": [
".meta/example.ex"
]
},
"blurb": "Given a year, report if it is a leap year.",
"source": "CodeRanch Cattle Drive, Assignment 3",
"source_url": "https://coderanch.com/t/718816/Leap"
}

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{"track":"elixir","exercise":"leap","id":"8bd50f0b5d7c4308bca361b49e63d755","url":"https://exercism.org/tracks/elixir/exercises/leap","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/leap/.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").
leap-*.tar

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elixir/leap/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/year.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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elixir/leap/README.md Normal file
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# Leap
Welcome to Leap on Exercism's Elixir Track.
If you need help running the tests or submitting your code, check out `HELP.md`.
## Instructions
Given a year, report if it is a leap year.
The tricky thing here is that a leap year in the Gregorian calendar occurs:
```text
on every year that is evenly divisible by 4
except every year that is evenly divisible by 100
unless the year is also evenly divisible by 400
```
For example, 1997 is not a leap year, but 1996 is.
1900 is not a leap year, but 2000 is.
## Notes
Though our exercise adopts some very simple rules, there is more to learn!
For a delightful, four minute explanation of the whole leap year phenomenon, go watch [this youtube video][video].
[video]: https://www.youtube.com/watch?v=xX96xng7sAE
## Source
### Created by
- @rubysolo
### Contributed to by
- @angelikatyborska
- @Cohen-Carlisle
- @dalexj
- @devonestes
- @glennular
- @jinyeow
- @korbin
- @kytrinyx
- @lpil
- @neenjaw
- @parkerl
- @sotojuan
- @Teapane
- @waiting-for-dev
### Based on
CodeRanch Cattle Drive, Assignment 3 - https://coderanch.com/t/718816/Leap

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elixir/leap/lib/year.ex Normal file
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defmodule Year do
@doc """
Returns whether 'year' is a leap year.
A leap year occurs:
on every year that is evenly divisible by 4
except every year that is evenly divisible by 100
unless the year is also evenly divisible by 400
"""
@spec leap_year?(non_neg_integer) :: boolean
def leap_year?(year) when rem(year, 400) == 0, do: true
def leap_year?(year) when rem(year, 100) == 0, do: false
def leap_year?(year) when rem(year, 4) == 0, do: true
def leap_year?(_year), do: false
end

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elixir/leap/mix.exs Normal file
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defmodule Year.MixProject do
use Mix.Project
def project do
[
app: :year,
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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ExUnit.start()
ExUnit.configure(exclude: :pending, trace: true)

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defmodule YearTest do
use ExUnit.Case
# @tag :pending
test "year not divisible by 4 is common year" do
refute Year.leap_year?(2015)
end
# @tag :pending
test "year divisible by 2, not divisible by 4 is common year" do
refute Year.leap_year?(1970)
end
# @tag :pending
test "year divisible by 4, not divisible by 100 is leap year" do
assert Year.leap_year?(1996)
end
# @tag :pending
test "year divisible by 4 and 5 is still a leap year" do
assert Year.leap_year?(1960)
end
@tag :pending
test "year divisible by 100, not divisible by 400 is common year" do
refute Year.leap_year?(2100)
end
# @tag :pending
test "year divisible by 100 but not by 3 is still not a leap year" do
refute Year.leap_year?(1900)
end
# @tag :pending
test "year divisible by 400 is leap year" do
assert Year.leap_year?(2000)
end
# @tag :pending
test "year divisible by 400 but not by 125 is still a leap year" do
assert Year.leap_year?(2400)
end
# @tag :pending
test "year divisible by 200, not divisible by 400 in common year" do
refute Year.leap_year?(1800)
end
end