Named Number Lists

Mix.install([
  {:jason, "~> 1.4"},
  {:kino, "~> 0.8.0", override: true},
  {:youtube, github: "brooklinjazz/youtube"},
  {:hidden_cell, github: "brooklinjazz/hidden_cell"}
])

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Setup

Ensure you type the ea keyboard shortcut to evaluate all Elixir cells before starting. Alternatively you can evaluate the Elixir cells as you read.

Named Number Lists

Generate a list with ten random integers from 0 to 9. Convert each integer in this list to it’s string representation so 1 would become "one".

# input
[1, 2, 4, 2, 7, 8, 0, 4, 5, 6]
# output
["one", "two", "four", "two", "seven", "eight", "zero", "four", "five", "six"]

flowchart
   0 --> zero
   1 --> one
   2 --> two
   3 --> three
   4 --> four
   5 --> five
   6 --> six
   7 --> seven
   8 --> eight
   9 --> nine

Example Solution

  random_integers = Enum.map(1..10, fn _ -> Enum.random(0..9) end)

  Enum.map(random_integers, fn integer ->
    case integer do
      0 -> "zero"
      1 -> "one"
      2 -> "two"
      3 -> "three"
      4 -> "four"
      5 -> "five"
      6 -> "six"
      7 -> "seven"
      8 -> "eight"
      9 -> "nine"
    end
  end)

Enter your solution below.

Mark As Completed

file_name = Path.basename(Regex.replace(~r/#.+/, __ENV__.file, ""), ".livemd")

save_name =
  case Path.basename(__DIR__) do
    "reading" -> "named_number_lists_reading"
    "exercises" -> "named_number_lists_exercise"
  end

progress_path = __DIR__ <> "/../progress.json"
existing_progress = File.read!(progress_path) |> Jason.decode!()

default = Map.get(existing_progress, save_name, false)

form =
  Kino.Control.form(
    [
      completed: input = Kino.Input.checkbox("Mark As Completed", default: default)
    ],
    report_changes: true
  )

Task.async(fn ->
  for %{data: %{completed: completed}} <- Kino.Control.stream(form) do
    File.write!(
      progress_path,
      Jason.encode!(Map.put(existing_progress, save_name, completed), pretty: true)
    )
  end
end)

form

Commit Your Progress

Run the following in your command line from the curriculum folder to track and save your progress in a Git commit. Ensure that you do not already have undesired or unrelated changes by running git status or by checking the source control tab in Visual Studio Code.

$ git checkout -b named-number-lists-exercise
$ git add .
$ git commit -m "finish named number lists exercise"
$ git push origin named-number-lists-exercise

Create a pull request from your named-number-lists-exercise branch to your solutions branch. Please do not create a pull request to the DockYard Academy repository as this will spam our PR tracker.

DockYard Academy Students Only:

Notify your teacher by including @BrooklinJazz in your PR description to get feedback. You (or your teacher) may merge your PR into your solutions branch after review.

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