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Download Functional Programming for Java Developers by Dean Wampler PDF

By Dean Wampler

Software improvement at the present time is embracing useful programming (FP), no matter if it's for writing concurrent courses or for handling enormous facts. the place does that go away Java builders? This concise booklet bargains a practical, approachable creation to FP for Java builders or somebody who makes use of an object-oriented language.

Dean Wampler, Java specialist and writer of Programming Scala (O'Reilly), indicates you ways to use FP ideas corresponding to immutability, avoidance of side-effects, and higher-order features for your Java code. each one bankruptcy offers workouts that will help you perform what you've discovered. when you take hold of some great benefits of sensible programming, you’ll realize that it improves all the code you write.
* research easy FP ideas and observe them to object-oriented programming
* become aware of how FP is extra concise and modular than OOP
* Get priceless FP classes in your Java variety design—such as fending off nulls
* layout info buildings and algorithms utilizing practical programming ideas
* Write concurrent courses utilizing the Actor version and software program transactional reminiscence
* Use sensible libraries and frameworks for Java—and study the place to head subsequent to deepen your sensible programming talents

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Furthermore, Java’s type safety won’t let you “forget” that an option is returned. You must determine if a Some was returned and extract the value before calling methods with it, or handle the None case. Using Option as a return type improves the robustness of your code compared to allowing nulls and it provides better documentation for users of the code. We are expressing and enforcing the optional availability of a value through the type system. Algebraic Data Types and Abstract Data Types In the previous discussion the Option interface has only two valid implementing types: Some and None.

So, its hasValue always returns true and its get method simply returns the value. It also provides conventional toString, equals, and hashCode methods. I’ll explain why Some is declared final in the next section. Finally, here is None, the only other valid subtype of Option: package option; public final class None extends Option { public static class NoneHasNoValue extends RuntimeException {} 18 | Chapter 2: What Is Functional Programming? class) ? false : true; } } @Override public int hashCode() { return -1; } A None instance is used when the Option has no value.

Designing Types | 21 One final point on algebraic data types. Recall that Some and None are final and can’t be subtyped. Final types are often considered bad in Java, because you can’t subclass them to create special versions for testing. That’s really only a problem for types with strong dependencies on other objects that would make testing difficult, like networked services. Well-designed algebraic data types should never have such connections, so there is really nothing that would need to be replaced by a test-only derivative.

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