Number Finder

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

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Number Finder

Create a NumberFinder module which can find the smallest/1 number in a list, and the largest/1 number in a list.

NumberFinder.smallest([2, 3, 1])
1

NumberFinder.largest([2, 3, 1])
3

Example Solution

defmodule NumberFinder do
  def smallest(number_list) do
    Enum.reduce(number_list, fn each, acc ->
      min(each, acc)
    end)
  end

  def largest(number_list) do
    Enum.reduce(number_list, fn each, acc ->
      max(each, acc)
    end)
  end
end

defmodule NumberFinder do
  @doc """
  Find the smallest number in a list

  ## Examples

    iex> NumberFinder.smallest([2, 3, 1])
    1
    iex> NumberFinder.smallest([2, 2, 3, 4])
    2
    iex> NumberFinder.smallest([2, 2, 3, 4, 10, 20, -3])
    -3
  """
  def smallest(number_list) do
    Enum.reduce(number_list, fn n, acc -> 
      min(n, acc)
    end)
  end

  @doc """
  Find the largest number in a list

  ## Examples

    iex> NumberFinder.largest([2, 3, 1])
    3
    iex> NumberFinder.largest([2, 2, 3, 4, 4])
    4
    iex> NumberFinder.largest([2, 2, 3, 4, 10, 20, -3])
    20
  """
  def largest(number_list) do
    Enum.reduce(number_list, fn n, acc -> 
      max(n, acc)
    end)
  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 Number Finder exercise"
$ git push

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