instructions.md

In this exercise you need to implement some functions to manipulate a list of programming languages.

1. Define a function to return an empty language list

Define the new/1 function that takes no parameters and returns an empty list.

LanguageList.new()
# => []

2. Define a function to add a language to the list

Define the add/2 function that takes 2 parameters (a language list and a string literal of a language). It should return the resulting list with the new language prepended to the given list.

LanguageList.new() |> LanguageList.add("Clojure")
# => ["Clojure"]

3. Define a function to remove a language from the list

Define the remove/2 function that takes 1 parameter1 (a language list). It should return the list minus the first item.

LanguageList.new() |> LanguageList.add("Haskell") |> LanguageList.remove()
# => []

4. Define a function to return the first item in the list

Define the first/1 function that takes 1 parameter (a language list). It should return the string literal of the language that occurs first in the list.

LanguageList.new() |> LanguageList.add("Prolog") |> LanguageList.first()
# => "Prolog"

5. Define a function to return how many languages are in the list

Define the count/1 function that takes 1 parameter (a language list). It should return the number of languages in the list.

LanguageList.new() |> LanguageList.add("Elm") |> LanguageList.first()
# => 1

6. Define a function to determine if the list is exciting

Define the exciting_list?/1 function which takes 1 parameter (a language list). It should return a boolean value. It should return true if "Elixir" is one of the languages in the list.

LanguageList.new() |> LanguageList.add("Elixir") |> LanguageList.first()
# => true