Shopping List

Mix.install([
  {:kino, github: "livebook-dev/kino", override: true},
  {:kino_lab, "~> 0.1.0-dev", github: "jonatanklosko/kino_lab"},
  {:vega_lite, "~> 0.1.4"},
  {:kino_vega_lite, "~> 0.1.1"},
  {:benchee, "~> 0.1"},
  {:ecto, "~> 3.7"},
  {:math, "~> 0.7.0"},
  {:faker, "~> 0.17.0"},
  {:utils, path: "#{__DIR__}/../utils"},
  {:tested_cell, git: "https://github.com/BrooklinJazz/tested_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.

Text Shopping List

You are creating a shopping list app. Users have the ability to add items into their shopping_cart. Each item is represented as a string.

In the Elixir cells below, use ++ and -- to add the items show.

• Add "grapes", "walnuts", and "apples" to the shopping_cart
• Add "blueberries", "chocolate", and "pizza" to the shopping_cart.
• Remove "grapes" and "walnuts" from the shopping_cart
• Add three "banana"s to the shopping_cart

ExUnit.start(auto_run: false)

defmodule Assertion do
  use ExUnit.Case

  test "" do
    shopping_cart = []
    list = [] ++ ["grapes", "walnuts", "apples"]
    list = list ++ ["blueberries", "chocolate", "pizza"]
    list = list -- ["grapes", "walnuts"]
    list = list ++ ["banana", "banana", "banana"]

    assert is_list(shopping_cart), "Ensure shopping_list is still a list."

    assert Enum.sort(list) == Enum.sort(shopping_cart),
           "Ensure your shopping list has all of the expected items"

    assert shopping_cart == list, "Ensure you add and remove items in the expected order"
  end
end

ExUnit.run()

# Make variables and modules defined in the test available.
# Also allows for exploration using the output of the cell.
shopping_cart = []

Text Shopping List With Quantities

Users of your shopping list app have asked that they be able to include the quantity of each item to make adding many items easier.

In the Elixir cell below, use a keyword list in the format [item: quantity] to add or remove items from the shopping_cart

• Add 1 milk and 12 eggs

• Add 2 bars_of_butter and 10 candies

• Remove 2 bars_of_butter

• Remove 5 candies (Notice 5 and not 10!).

  Hint Likely you will need to remove 10 candies, and then add 5 candies.

ExUnit.start(auto_run: false)

defmodule Assertion do
  use ExUnit.Case

  test "" do
    shopping_cart = []
    list = [] ++ [milk: 1, eggs: 12]
    list = list ++ [bars_of_butter: 2, candies: 10]
    list = list -- [bars_of_butter: 2]
    list = list -- [candies: 10]
    list = list ++ [candies: 5]

    assert is_list(shopping_cart), "Ensure shopping_list is still a list."

    assert Enum.sort(list) == Enum.sort(shopping_cart),
           "Ensure your shopping list has all of the expected items"

    assert shopping_cart == list, "Ensure you add and remove items in the expected order"
  end
end

ExUnit.run()

# Make variables and modules defined in the test available.
# Also allows for exploration using the output of the cell.
shopping_cart = []

Commit Your Progress

Run the following in your command line from the project folder to track and save your progress in a Git commit.

$ git add .
$ git commit -m "finish shopping list exercise"