Tracks on Tracks on Tracks
10 Points
lists
Instructions
In this exercise you'll be writing code to keep track of a list of programming languages you want to learn on Exercism.
You have six tasks, which will all involve dealing with lists.
1. Create a new list
To keep track of the languages you want to learn, you'll need to create a new list. Define the new_list function that returns a new, empty list.
new_list()
// -> []2. Define an existing list
Currently, you have a piece of paper listing the languages you want to learn: Gleam, Go, and TypeScript. Define the existing_list function to return this list.
existing_list()
// -> ["Gleam", "Go", "TypeScript"]3. Add a new language to a list
As you explore Exercism and find more interesting languages, you want to add them to your list. Implement the add_language function to add a new language to the beginning of your list.
add_language(["OCaml", "Elixir"], "Scheme")
// -> ["Scheme", "OCaml", "Elixir"]4. Count the languages in the list
Counting the languages one-by-one is inconvenient. Implement the count_languages function to count the number of languages on your list.
count_languages(["jq", "Elm", "Rust", "Kotlin"])
// -> 45. Reverse the list
At some point, you realize that your list is actually ordered backwards! Implement the reverse_list function to reverse your list.
reverse_list(["Python", "Julia", "Idris", "COBOL"])
// -> ["COBOL", "Idris", "Julia", "Python"]6. Check if list is exciting
While you love all languages, Gleam has a special place in your heart. As such, you're really excited about a list of languages if:
- The first on the list is Gleam.
- The second item on the list is Gleam and the list contain either two or three languages.
Implement the exciting_list function to check if a list of languages is exciting:
exciting_list(["Lua", "Gleam"])
// -> TrueTracks on Tracks on Tracks
10 Points
lists
Instructions
In this exercise you'll be writing code to keep track of a list of programming languages you want to learn on Exercism.
You have six tasks, which will all involve dealing with lists.
1. Create a new list
To keep track of the languages you want to learn, you'll need to create a new list. Define the new_list function that returns a new, empty list.
new_list()
// -> []2. Define an existing list
Currently, you have a piece of paper listing the languages you want to learn: Gleam, Go, and TypeScript. Define the existing_list function to return this list.
existing_list()
// -> ["Gleam", "Go", "TypeScript"]3. Add a new language to a list
As you explore Exercism and find more interesting languages, you want to add them to your list. Implement the add_language function to add a new language to the beginning of your list.
add_language(["OCaml", "Elixir"], "Scheme")
// -> ["Scheme", "OCaml", "Elixir"]4. Count the languages in the list
Counting the languages one-by-one is inconvenient. Implement the count_languages function to count the number of languages on your list.
count_languages(["jq", "Elm", "Rust", "Kotlin"])
// -> 45. Reverse the list
At some point, you realize that your list is actually ordered backwards! Implement the reverse_list function to reverse your list.
reverse_list(["Python", "Julia", "Idris", "COBOL"])
// -> ["COBOL", "Idris", "Julia", "Python"]6. Check if list is exciting
While you love all languages, Gleam has a special place in your heart. As such, you're really excited about a list of languages if:
- The first on the list is Gleam.
- The second item on the list is Gleam and the list contain either two or three languages.
Implement the exciting_list function to check if a list of languages is exciting:
exciting_list(["Lua", "Gleam"])
// -> True