Frege
Frege is a purely functional programming language inspired by Haskell. It is primarily used for writing highly expressive and type-safe programs in functional programming paradigms.
Hello, world code example:
module HelloWorld where
main _ = println "Hello world!"
Popularity: Less than 1% of developers are using or have used this language.*
*According to StackOverflow's 2023 survey.
Repositories on GitHub: 222