Learning Exercise
Functions for handling input and output are provided by the IO module.
To write a string to the standard output, use IO.puts. IO.puts always adds a new line at the end of the string. If you don't want that behavior, use IO.write instead. Both functions return the atom :ok if they succeed.
IO.puts("Hi!")
# > Hi!
# => :ok
IO.puts is useful for writing strings, but not much else. If you need a tool for debugging that will allow you to write any value to standard output, use IO.inspect instead. IO.inspect returns the value it was passed unchanged, so it can be inserted in any point in your code. It also accepts many options, for example :label, that will allow you to distinguish it from other IO.inspect calls.
To read a line from the standard input, use IO.gets. IO.gets accepts one argument - a string that it will print as a prompt for the input. IO.gets doesn't add a new line after the prompt, include it yourself if you need it.
IO.gets("What's your name?\n")
# > What's your name?
# < Mary
# => "Mary\n"
You and your friends love to play pen-and-paper role-playing games, but you noticed that it's difficult to get new people to join your group. They often struggle with character creation. They don't know where to start. To help new players out, you decided to write a small program that will guide them through the process.
Implement the RPG.CharacterSheet.welcome/0 function. It should print a welcome message, and return :ok.
RPG.CharacterSheet.welcome()
# > Welcome! Let's fill out your character sheet together.
# => :ok
Implement the RPG.CharacterSheet.ask_name/0 function. It should print a question, wait for an answer, and return the answer without leading and trailing whitespace.
RPG.CharacterSheet.ask_name()
# > What is your character's name?
# < Mathilde
# => "Mathilde"
Implement the RPG.CharacterSheet.ask_class/0 function. It should print a question, wait for an answer, and return the answer without leading and trailing whitespace.
RPG.CharacterSheet.ask_class()
# > What is your character's class?
# < healer
# => "healer"
Implement the RPG.CharacterSheet.ask_level/0 function. It should print a question, wait for an answer, and return the answer as an integer.
RPG.CharacterSheet.ask_level()
# > What is your character's level?
# < 2
# => 2
Implement the RPG.CharacterSheet.run/0 function. It should welcome the new player, ask for the character's name, class, and level, and return the character sheet as a map. It should also print the map with the label "Your character".
RPG.CharacterSheet.run()
# > Welcome! Let's fill out your character sheet together.
# > What is your character's name?
# < Mathilde
# > What is your character's class?
# < healer
# > What is your character's level?
# < 2
# > Your character: %{class: "healer", level: 2, name: "Mathilde"}
# => %{class: "healer", level: 2, name: "Mathilde"}
Edit via GitHub
Sign up to Exercism to learn and master Elixir with 57 concepts, 158 exercises, and real human mentoring, all for free.