Time Converting

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

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Time Converting

Often we have to convert seconds, minutes, hours, and days. You’re going to create a TimeConverter module which can handle all of this for us.

We’ll use the atoms :days, :hours, :minutes, or :seconds to represent days, hours, minutes, and seconds.

Example Solution

defmodule TimeConverter do
  def to_seconds(amount, unit) do
    case unit do
      :seconds -> amount
      :minutes -> amount * 60
      :hours -> amount * 60 * 60
      :days -> amount * 60 * 60 * 24
    end
  end

  def from_seconds(amount, unit) do
    case unit do
      :seconds -> amount * 1.0
      :minutes -> amount / 60
      :hours -> amount / 60 / 60
      :days -> amount / 60 / 60 / 24
    end
  end
end

Implement the TimeConverter.to_seconds/2 and TimeConverter.from_seconds/2 functions as documented.

defmodule TimeConverter do
  @moduledoc """
  Documentation for `TimeConverter`
  """

  @doc """
  Convert a unit of time to a number of seconds.

  ## Examples

    iex> TimeConverter.to_seconds(1, :seconds)
    1

    iex> TimeConverter.to_seconds(1, :minutes)
    60
    
    iex> TimeConverter.to_seconds(1, :hours)
    3600

    iex> TimeConverter.to_seconds(1, :days)
    86400

  """
  def to_seconds(amount, unit) do
    case unit do
      :seconds -> amount
      :minutes -> 60 * amount
      :hours -> 60 * 60 * amount
      :days -> 60 * 60 * 24 * amount
    end
  end

  @doc """
  Convert a number of seconds to a unit of time.
  Return a float, as these values will require division using `/`.

  ## Examples

    iex> TimeConverter.from_seconds(1, :seconds)
    1.0

    iex> TimeConverter.from_seconds(60, :minutes)
    1.0
    
    iex> TimeConverter.from_seconds(3600, :hours)
    1.0

    iex> TimeConverter.from_seconds(86400, :days)
    1.0

  """
  def from_seconds(amount, unit) do
    case unit do
      :seconds -> amount * 1.0
      :minutes -> amount / 60
      :hours -> amount / 60 / 60
      :days -> amount / 60 / 60 / 24
    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 Time Converting 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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