Functional Programming for Java Developers by Dean Wampler

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 great info. the place does that depart Java builders? This concise e-book deals a realistic, approachable creation to FP for Java builders or a person who makes use of an object-oriented language.

Dean Wampler, Java professional and writer of Programming Scala (O'Reilly), indicates you ways to use FP ideas reminiscent of immutability, avoidance of side-effects, and higher-order features for your Java code. each one bankruptcy offers routines that can assist you perform what you've discovered. when you clutch the advantages of sensible programming, you’ll observe that it improves all the code you write.
* study simple FP ideas and follow them to object-oriented programming
* detect how FP is extra concise and modular than OOP
* Get valuable FP classes in your Java sort design—such as fending off nulls
* layout facts buildings and algorithms utilizing useful programming ideas
* Write concurrent courses utilizing the Actor version and software program transactional reminiscence
* Use useful libraries and frameworks for Java—and research the place to move subsequent to deepen your practical programming talents

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Suppose some method m1 takes a Function1 argument. What would happen if you passed an instance f1 of type Func tion1 to m1? In Java, how could you change the declaration of m1 so that the compiler would allow you to pass f1 to it? Why would that be a valid thing to do, at least from the perspective of “safe typing”? b. Considering the same method m1, suppose you wanted to pass a function f2 of type Function1 to m1? How could you change the declaration of m1 so that the compiler would allows you to pass f2 to it?

That’s useful, but there is a better way. Interest in Domain-Specific Languages is another recent, popular trend (see, for example, [Ghosh2011a] and [Ghosh2011b]). DSLs try to capture the idiomatic language used by domain experts directly in the code. You can implement DSLs in both objectoriented and functional languages. Some languages provide better support for custom DSL syntax than others. Back to our example, it can be useful to represent a domain with a DSL at the upper levels of abstraction, but questionable to create explicit object representations under this surface.

Notice that algebraic data types are making the same kinds of assertions about types themselves, imposing a rigor that helps us think about allowed representations of state and transitions from an instance representing one state to an instance representing another state. put("Scala" , "Hybrid Object-Functional"); Maps don’t make good algebraic data types, because the value of defining an “empty” vs. a “non-empty” type (or similar decomposition) is less useful. In part, this reflects the fact that the “obvious” implementation of List is strongly implied by the head and tail design.

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