Idris is a general-purpose, purely functional programming language with dependent types. It is primarily used for research in formal methods, theorem proving, and programming language design.

Hello, world code example:

module Main

mainĀ : IO ()
main = putStrLn "Hello world!"

Popularity: Less than 1% of developers are using or have used this language.*
*According to StackOverflow's 2023 survey.

Repositories on GitHub: 2,049