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Danil Negrienko 2024-06-29 03:17:21 -04:00
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{
"authors": [
"DoggettCK"
],
"contributors": [
"amencarini",
"angelikatyborska",
"Cohen-Carlisle",
"devonestes",
"neenjaw",
"sotojuan"
],
"files": {
"solution": [
"lib/string_series.ex"
],
"test": [
"test/string_series_test.exs"
],
"example": [
".meta/example.ex"
]
},
"blurb": "Given a string of digits, output all the contiguous substrings of length `n` in that string.",
"source": "A subset of the Problem 8 at Project Euler",
"source_url": "https://projecteuler.net/problem=8"
}

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{"track":"elixir","exercise":"series","id":"17f1138f483f482b8bb2877fbfb0f91c","url":"https://exercism.org/tracks/elixir/exercises/series","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/series/.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").
series-*.tar

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elixir/series/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/string_series.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/series/README.md Normal file
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# Series
Welcome to Series on Exercism's Elixir Track.
If you need help running the tests or submitting your code, check out `HELP.md`.
## Instructions
Given a string of digits, output all the contiguous substrings of length `n` in that string in the order that they appear.
For example, the string "49142" has the following 3-digit series:
- "491"
- "914"
- "142"
And the following 4-digit series:
- "4914"
- "9142"
And if you ask for a 6-digit series from a 5-digit string, you deserve whatever you get.
Note that these series are only required to occupy _adjacent positions_ in the input;
the digits need not be _numerically consecutive_.
## Source
### Created by
- @DoggettCK
### Contributed to by
- @amencarini
- @angelikatyborska
- @Cohen-Carlisle
- @devonestes
- @neenjaw
- @sotojuan
### Based on
A subset of the Problem 8 at Project Euler - https://projecteuler.net/problem=8

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defmodule StringSeries do
@doc """
Given a string `s` and a positive integer `size`, return all substrings
of that size. If `size` is greater than the length of `s`, or less than 1,
return an empty list.
"""
@spec slices(s :: String.t(), size :: integer) :: list(String.t())
def slices(s, size) do
length = String.length(s)
for start <- 0..(length - size), size in 1..length, into: [], do: String.slice(s, start, size)
end
end

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elixir/series/mix.exs Normal file
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defmodule StringSeries.MixProject do
use Mix.Project
def project do
[
app: :string_series,
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 StringSeriesTest do
use ExUnit.Case
test "slices of size 1 from one" do
assert StringSeries.slices("1", 1) == ["1"]
end
test "slices of size 1 from two" do
assert StringSeries.slices("12", 1) == ["1", "2"]
end
test "slices of size 1 from more" do
assert StringSeries.slices("01234", 1) == ["0", "1", "2", "3", "4"]
end
test "slices of size 2" do
assert StringSeries.slices("35", 2) == ["35"]
end
test "slices of size 2 overlap" do
assert StringSeries.slices("9142", 2) == ["91", "14", "42"]
end
test "slices of size 2 from more" do
assert StringSeries.slices("01234", 2) == ["01", "12", "23", "34"]
end
test "slices of size 3" do
assert StringSeries.slices("01234", 3) == ["012", "123", "234"]
end
test "slices of size 4" do
assert StringSeries.slices("01234", 4) == ["0123", "1234"]
end
test "slices include duplicates" do
assert StringSeries.slices("777777", 3) == ["777", "777", "777", "777"]
end
test "slices of a long series" do
assert StringSeries.slices("918493904243", 5) == [
"91849",
"18493",
"84939",
"49390",
"93904",
"39042",
"90424",
"04243"
]
end
test "slices same size as string" do
assert StringSeries.slices("01234", 5) == ["01234"]
end
test "Unicode characters count as a single character" do
assert StringSeries.slices("José", 1) == ["J", "o", "s", "é"]
assert StringSeries.slices("José", 2) == ["Jo", "os", ""]
end
test "slices with size longer than string return empty list" do
assert StringSeries.slices("01234", 6) == []
end
test "slices with size zero or negative return empty list" do
assert StringSeries.slices("01234", -1) == []
assert StringSeries.slices("01234", 0) == []
end
end

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