Itinerary

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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Itinerary

You are building a day planning application. Users will provide the time it takes to complete an activity in minutes and you will determine if there is enough time to fit the activity between two DateTimes.

Example Solution

defmodule Itinerary do
  def has_time?(start, finish, minutes) do
    DateTime.diff(finish, start) >= minutes * 60
  end
end

Implement the Itinerary module as documented.

defmodule Itinerary do
  @doc """
  Given a number of minutes, determine if there is enough time 
  between two `DateTimes` to fit an activity lasting a number of minutes.

  ## Examples

    iex> Itinerary.has_time?(~U[2020-01-01 12:00:00Z], ~U[2020-01-01 12:01:00Z], 1)
    true
    
    iex> Itinerary.has_time?(~U[2020-01-01 12:00:00Z], ~U[2020-01-01 12:10:00Z], 10)
    true

    iex> Itinerary.has_time?(~U[2020-01-01 07:00:00Z], ~U[2020-01-01 08:00:00Z], 60)
    true

    iex> Itinerary.has_time?(~U[2020-01-01 12:00:00Z], ~U[2020-01-01 12:30:00Z], 31)
    false

    iex> Itinerary.has_time?(~U[2020-01-01 07:00:00Z], ~U[2020-01-01 08:00:00Z], 61)
    false
    
  """
  def has_time?(start, finish, minutes) do
  end
end

Mark As Completed

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

save_name =
  case Path.basename(__DIR__) do
    "reading" -> "itinerary_reading"
    "exercises" -> "itinerary_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 itinerary-exercise
$ git add .
$ git commit -m "finish itinerary exercise"
$ git push origin itinerary-exercise

Create a pull request from your itinerary-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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