Treasure Matching

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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Treasure Matching

In this exercise, you’re going to use pattern matching to extract the "jewel" string from the data provided and bind it to a jewel variable. The first exercise is complete for example.

[_, _, _, jewel] = [1, 2, 3, "jewel"]
jewel

Use pattern matching to bind a jewel variable to the "jewel" string.

[1, 2, 3, "jewel"]

%{key1: "value", key2: "jewel"}

%{1 => "jewel"}

%{%{key: [1, 2, 3, 4, 5, {}]} => "jewel"}

%{north: %{south: %{west: %{east: "jewel"}}}}

[2, "jewel"]

["jewel", 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]

[1, "jewel", 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]

[1, 2, "jewel", 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]

[[], [1, [2, "jewel"]]]

"here is the jewel"

{"jewel"}

{"jewel", 1}

{1, 2, "jewel"}

["jewel"] ++ Enum.to_list(1..100)

[key: "jewel"]

[south: "jewel", east: {1, 2}]

Enum.map(1..4, fn each -> (each == 2 && "jewel") || each end)

Enum.map(1..4, &((&1 > 3 && "jewel") || &1))

Mark As Completed

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

save_name =
  case Path.basename(__DIR__) do
    "reading" -> "treasure_matching_reading"
    "exercises" -> "treasure_matching_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 treasure-matching-exercise
$ git add .
$ git commit -m "finish treasure matching exercise"
$ git push origin treasure-matching-exercise

Create a pull request from your treasure-matching-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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