PLT Design has released version 6.1 of Racket, its general purpose, multi-paradigm programming language belonging to the Lisp/Scheme family. Racket 6.1 introduces a new way of handling local recursive variable definitions and several other language features.
CQRS and Event Sourcing provide a clear and concise way to build distributed applications that adhere to the reactive manifesto, Duncan DeVore claimed in a recent presentation sharing his experiences building a distributed application using Akka and Scala.
F# has supported both iOS and Android native programming through Xamarin since at least Xamarin 4.8 and can be efficiently used to create native apps on both platforms. Let's give a look at some experience reports.
Streams is a C++14 library that provides lazy evaluation and functional-style transformations on the data, to ease the use of C++ standard library containers and algorithms. Streams support many common functional operations such as map, filter, and reduce. InfoQ interviews Streams' author.
Silk has recently open-sourced a REST framework for Haskell, called "rest". It provides a DSL for defining REST services which can then be run in popular web frameworks such as happstack. This comes with features such as type-safe URLs, abstraction of format-type support, and a clean separation of API specification and business logic.
Facebook has open-sourced Haxl, a library for efficient, concurrent data-access. The library leverages the traditional strengths of Haskell such as expressive type system, correctness and safety guarantees, as well as GHC's high performance run-time to solve the thorny issue of implicit, concurrent data access.
The Play 2.3 release increases modularization of the framework by separating parts from the framework. Also, the Play shell has been replaced by Activator, which includes a browser UI and project templates. InfoQ also talked to Play tech lead James Roper to learn more about the changes and futures plans.
Implementing Domain-Driven Design (DDD) concepts using object orientation principles with state and behaviour often gives you a muddled mutable model, instead building domain objects with only state and behaviour as standalone functions leads to a better realization, Debasish Ghosh claims in a recent blog post.
Typesafe has recently announced the release of Scala 2.11 under the standard 3-clause BSD license. This is a major release which includes improvements in scalac, the REPL, packaging/modularization, macros, the Collections library, and various bug fixes. Scala 2.11 targets Java 6, with only limited, experimental support for Java 8. Scala 2.11 is not binary compatible with the 2.10 series.
Groovy Project Manager at Pivotal Guillaume Laforge today announced the release of Groovy 2.3, the first major Groovy release this year, and the first major release of Groovy to feature official support for running on the recently released Java 8.
Typesafe has announced the early preview of Akka Streams, an open source implementation of the Reactive Streams draft specification using an Actor-based implementation. Reactive Streams is an initiative to provide a standard for asynchronous stream processing with non-blocking back pressure on the JVM. Back pressure in needed to make sure the data producer doesn't overwhelm the data consumer.
GHC 7.8.1 was recently released, bringing several language, compiler and performance improvements. Haskell can now be compiled for iOS, and sports new features such as Closed Type Families, Roles, Overloaded Lists, Pattern Synonyms.
A focus on behaviour and a more declarative style of code are two benefits for Domain-Driven Design (DDD) when moving from an object-oriented language like C# to a functional one like F#, Lev Gorodinski claims in a recent presentation, using an example that includes event sourcing and Command-Query Responsibility Separation (CQRS) to show some of the benefits and challenges in a move to F#.
Using a functional language in domain-driven design (DDD) the actual code can often become simple enough to be used instead of UML diagrams when discussing with domain experts, Scott Wlaschin stated in a recent talk about domain modelling together with functional programming using F#.