Ruby 3.0.0 Preview 1 Released

8 months ago - Direct link

We are pleased to announce the release of Ruby 3.0.0-preview1.

It introduces a number of new features and performance improvements.

RBS

RBS is a language to describe the types of Ruby programs.
Type checkers including type-profiler and other tools supporting RBS will understand Ruby programs much better with RBS definitions.

You can write down the definition of classes and modules: methods defined in the class, instance variables and their types, and inheritance/mix-in relations.
The goal of RBS is to support commonly seen patterns in Ruby programs and it allows writing advanced types including union types, method overloading, and generics. It also supports duck typing with interface types.

Ruby 3.0 ships with rbs gem, which allows parsing and processing type definitions written in RBS.

The following is a small example of RBS.

module ChatApp

  VERSION: String


  class Channel

    attr_reader name: String

    attr_reader messages: Array[Message]

    attr_reader users: Array[User | Bot]              # `|` means union types, `User` or `Bot`.

    def initialize: (String) -> void

    def post: (String, from: User | Bot) -> Message   # Method overloading is supported.

            | (File, from: User | Bot) -> Message

  end

end

See README of rbs gem for more detail.

Ractor (experimental)

Ractor is an Actor-model like concurrent abstraction designed to provide a parallel execution feature without thread-safety concerns.

You can make multiple ractors and you can run them in parallel. Ractor enables to make thread-safe parallel progr...

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8 months ago - Direct link

Article URL: https://www.ruby-lang.org/en/news/2020/09/25/ruby-3-0-0-preview1-released/?hn=t

Comments URL: https://news.ycombinator.com/item?id=24593093

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