Counting Votes

Mix.install([
  {:jason, "~> 1.4"},
  {:kino, "~> 0.9", override: true},
  {:youtube, github: "brooklinjazz/youtube"},
  {:hidden_cell, github: "brooklinjazz/hidden_cell"}
])

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Counting Votes

You’re creating a voting system. Voters are entered in a list of votes. You will be given a specific vote to count.

For example, you might take a class vote of cats vs dogs vs birds to decide which animal is most popular.

flowchart
D1[dogs]
D2[dogs]
D3[dogs]
C1[cats]
C2[cats]
B1[birds]

We’ll determine the number of votes for a single value. For example, there are 3 dogs.

flowchart
D1[dogs]
D2[dogs]
D3[dogs]
C1[cats]
C2[cats]
B1[birds]

style D1 fill:lightgreen
style D2 fill:lightgreen
style D3 fill:lightgreen

So we would return 3 votes for dogs.

Votes.count([:dogs, :dogs, :dogs, :cats, :cats, :birds], :dogs)
3

defmodule Votes do
  @doc """
  Count the number of votes.

  ## Examples

    iex> Votes.count([:dogs, :dogs, :dogs, :cats], :dogs)
    3

    iex> Votes.count([:dogs, :dogs, :dogs, :cats], :cats)
    1

    iex> Votes.count([:apples, :oranges, :apples, :cats], :birds)
    0
  """
  def count(votes, vote) do
  end
end

Bonus: Voter Tally

Counting each vote for dogs, cats, and birds becomes tedius. So, we instead want to determine the number of votes for each all at once.

flowchart
D1[dog]
D2[dog]
D3[dog]
C1[cat]
C2[cat]
B1[bird]

style D1 fill:lightgreen
style D2 fill:lightgreen
style D3 fill:lightgreen

style C1 fill:orange
style C2 fill:orange
style B1 fill:lightblue

There are 3 dogs, 2 cats, and 1 bird.

defmodule VoterTally do
  @doc """
  Determine the number of votes for each option received.

  ## Examples

    iex> VoterTally.tally([:dog, :dog, :cat, :cat, :cat, :bird])
    %{dog: 2, cat: 3, bird: 1}
  """
  def tally(votes) do
  end
end

Commit Your Progress

DockYard Academy now recommends you use the latest Release rather than forking or cloning our repository.

Run git status to ensure there are no undesirable changes. Then run the following in your command line from the curriculum folder to commit your progress.

$ git add .
$ git commit -m "finish Counting Votes exercise"
$ git push

We’re proud to offer our open-source curriculum free of charge for anyone to learn from at their own pace.

We also offer a paid course where you can learn from an instructor alongside a cohort of your peers. We will accept applications for the June-August 2023 cohort soon.

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