pony-maybe

Utilities for handling optional data in Pony.

Status

Installation

• Install pony-stable
• Update your bundle.json

{ 
  "type": "github",
  "repo": "mfelsche/pony-maybe"
}

• stable fetch to fetch your dependencies
• use "maybe" to include this package
• stable env ponyc to compile your application

Usage

use "maybe"

class WithOptionalStuff
  let _stuff: Maybe[String] = None

  fun update_stuff(new_stuff: String): Maybe[String] =>
    _stuff = new_stuff

  fun size(): USize =>
    Opt.get[USize](
      Opt.map[String, USize](_stuff, {(s) => s.size() }),
      0
    )