sly

It's not hard to write pure functional code in Java. Just avoid mutability, avoid side effects, and focus on writing expressions instead of statements. This might seem like a lot to sacrifice in a language with a long history of procedural object-oriented programming, but all of the necessary language features to write pure functional code exist in Java and the experience is actually quite enjoyable.

sly is a functional framework built using lambda. The core principle of its design is to express common application needs in a type-safe pure functional style, and in discrete units that can be included as necessary.

Feature Areas

sly is organized into modules that implement discrete feature areas:

• sly-app: An application wiring framework
• sly-jdk: Utilities for working with JDK types
• sly-lang: Functions and HyperFns for use in building algorithms
• sly-model: Basic value types for modelling common application concerns

Additionally, sly includes these modules to aid in testing:

• sly-hamcrest: Utilities for working with hamcrest
• sly-jdk-matchers: Matchers for JDK types
• sly-lambda-matchers: Matchers for lambda and other palatable types
• sly-model-test: Matchers and fixtures for value types in sly-model

Contributing

sly is a work in progress, and I am having a lot of fun making progress. For now, I'd like to write the code myself and at my own pace. Please submit feature requests, bug reports, and questions at https://github.com/inkblot/sly/issues.