FizzBuzz

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

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FizzBuzz

In the Elixir cell below create a Module FizzBuzz with a function run/1 which takes in a range.

Enumerate through the integers and return a new list where

• integers divisible by 3 are replaced with fizz
• integers divisible by 5 are replaced with buzz
• integers divisible by 3 and 5 are replaced with fizzbuzz
• integers not matching the above stay the same.

For example,

FizzBuzz.run(1..15)
[1, 2, "fizz", 4, "buzz", "fizz", 7, 8, "fizz", "buzz", 11, "fizz", 13, 14, "fizzbuzz"]

Example Solution

  defmodule FizzBuzz do
    def run(range) do
      Enum.map(range, fn int ->
        cond do
          rem(int, 3) == 0 and rem(int, 5) == 0 -> "fizzbuzz"
          rem(int, 3) == 0 -> "fizz"
          rem(int, 5) == 0 -> "buzz"
          true -> int
        end
      end)
    end
  end

  FizzBuzz.run(1..100)

Enter your solution below.

YouTube.new("https://www.youtube.com/watch?v=QPZ0pIK_wsc&ab_channel=TomScott")

defmodule FizzBuzz do
  @doc """
  FizzBuzz.

  ## Examples

    iex> FizzBuzz.run(1..15)
    [1, 2, "fizz", 4, "buzz", "fizz", 7, 8, "fizz", "buzz", 11, "fizz", 13, 14, "fizzbuzz"]

    iex> FizzBuzz.run(10..15)
    ["buzz", 11, "fizz", 13, 14, "fizzbuzz"]
  """
  def run(range) do
    Enum.map(range, &do_fizzbuzz/1)
  end

  defp do_fizzbuzz(n) do
    cond do
      fizz?(n) && buzz?(n) -> "fizzbuzz"
      fizz?(n) -> "fizz"
      buzz?(n) -> "buzz"
      true -> n
    end
  end

  defp buzz?(n), do: rem(n,5)==0
  defp fizz?(n), do: rem(n,3)==0
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 FizzBuzz 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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