PureScript

https://www.purescript.org/

A strongly-typed functional programming language that compiles to JavaScript

Benefis

• Compile to readable JavaScript and reuse existing JavaScript code easily
• An extensive collection of libraries for development of web applications, web servers, apps and more
• Excellent tooling and editor support with instant rebuilds
• An active community with many learning resources
• Build real-world applications using functional techniques and expressive types, such as:
  • Algebraic data types and pattern matching
  • Row polymorphism and extensible records
  • Higher kinded types
  • Type classes with functional dependencies
  • Higher-rank polymorphism

PureScript By Example

https://book.purescript.org/chapter1.html

https://try.purescript.org/

Function

Functions can be defined at the top-level of a file by specifying arguments before the equals sign:

add :: Int -> Int -> Int
add x y = x + y

diamond operator (<>)

string concatenation uses the diamond operator (<>), instead of the plus operator like in JavaScript.

showAddress :: Address -> String
showAddress addr = addr.street <> ", " <>
                   addr.city <> ", " <>
                   addr.state