Pen programming language

Pen is the programming language for scalable software development, focused on software maintainability and portability.

import Os'Context { Context }
import Os'File
import Os'Process

sayHello = \(ctx Context) none | error {
  File'Write(ctx, File'StdOut(), "Hello, world!\n")?

  none
}

main = \(ctx context) none {
  e = sayHello(ctx.Os)

  if _ = e as none {
    none
  } else if error {
    Process'Exit(ctx.Os, 1)
  }
}

Documentation

Getting started
Language reference
Code examples
- Applications and libraries
- Snippets

Pen aims to make large-scale software development efficient where a number of people develop software together for a long time. To realize that, it focuses on software maintainability and portability.

Maintainability
- Simplicity: The language is small and easy to learn but also full featured.
- Testability: Unit tests are always fast and reliable.
- Modifiability: Developers can change application logic independently from implementation details.
Portability
- Programs written in the language can be ported to different platforms including WebAssembly.