A toolkit for writing software in dart

Includes:

• ZIO a building block for writing effectful programs. Explore the full API: https://pub.dev/documentation/elemental/latest/elemental/ZIO-class.html
• Layer for composing dependencies
• nucleus, a simple state and dependency management tool. See more here: https://pub.dev/packages/nucleus
• Thanks to the fpdart package https://pub.dev/packages/fpdart:
  • Option
  • Either
• Immutable data structures, thanks to https://pub.dev/packages/fast_immutable_collections

Usage

The ZIO<R, E, A> type represents an synchronous or asynchronous operation.

• The R generic is for representing the requirements / environment
• The E generic is for representing errors
• The A generic is for the success type

There are a handful of helpful methods to ease composition!

import 'package:elemental/elemental.dart';

ZIO<NoEnv, Never, String> greeting(String name) => ZIO(() => "Hello $name!")

// Note `ZIO<NoEnv, Never, String>` can be shortened to `IO<String>`.

// Here we create a simple wrapper around `print`
IO<Unit> log(String message) => IO(() => print(message)).asUnit;

// And compose them together!
greeting.tap(log).run();

It is worth noting that the above will run synchronously. Only when you start using Future's in your program, will things run asynchronously.

Layers

A quick intro to services and layers can be found in example/.