Copyright © 2006 Frederic Daoud, Javelot Inc.
FunctionalJ is a library which makes it easy to use functional programming constructs in Java code.
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FunctionalJ provides the following features:
- Easily represent functions as objects
- Code using functional programming concepts such as mapping, filtering, and folding
- Use parameter binding, also known as partial application
- Write methods that accept functions as parameters and/or return functions as a result (higher-order functions)
- Replace procedural code with functional code for simpler, less error-prone computations
- Define functions by implementing an interface, subclassing a base class, or with a reflection mechanism, according to your preference
- Use a reflection mechanism to easily create functions that refer to existing constructors, instance methods, or static methods
- No need to deal with exceptions if you don't want to.
Summary of what is new in version 0.8:
- Major refactoring from version 0.7 to improve the API and provide stronger typing
- Now available in two versions, JDK 1.4 version and new JDK 1.5 version that uses generic types and other 1.5 features
- Pluggable reflection mechanisms
- Two reflection mechanism implementations: one that uses the standard JDK and one that uses cglib
- Improved documentation.
Table of Contents
- 1. Overview
- 1.1. What is FunctionalJ?
- 1.2. Why functional programming? Why FunctionalJ?
- 1.3. Quick, show me some code!
- 1.3.1. Does at least one object meet a certain condition?
- 1.3.2. Do all objects meet a certain condition?
- 1.3.3. Which objects meet a certain condition?
- 1.3.4. Apply a function to a list of objects, to obtain a list of results
- 1.3.5. Call a function of two parameters on corresponding objects from two lists
- 1.4. Summary of FunctionalJ's features
- 2. Installing Functionalj
- 3. Migrating from FunctionalJ 0.7.x to 0.8
- 4. Defining functions
- 5. Using reflection
- 6. Using higher-order functions
- 7. Using tuples
- 8. Utilities
- 9. Credits