JUGGL
Java Users Group
of
Greater Louisville
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JUGGL
Java Users Group
of
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Functional Java
Deven Phillips
Senior Software Engineer
Sungard Availability Services
Functional Java
What does it mean to be "functional"?
f(x) = x \times 2
f(x)=x×2
Functional Java
Properties of functions
Idempotence
f(x) = x \times 2
f(x)=x×2
Functional Java
Properties of functions
Composable
f(x, y) = x \times y
f(x,y)=x×y
g(x) = f(x, 5)
g(x)=f(x,5)
g(10) = 50
g(10)=50
Functional Java
Those are the MAIN tenets of Functions
What about everything else everyone is touting as "functional programming"?
Functional Java
How does Java implement these concepts?
Lambda Expressions
Concurrent Data Structures
Message Passing
Actors
"final" variables
Functional Java
Lambda ( ) Expressions
\lambda
λ
Functional Java
Concurrent Data Structures
java.util.concurrent.*
ConcurrentHashMap
Atomic<Numeric>
(Completable)Future
<Numeric>Accumulator
Functional Java
Streams
java.util.Collection
Collection.stream()
List.stream()
Map.stream()
Queue.stream()
Functional Programming With Java 8
By Deven Phillips
Functional Programming With Java 8
A discussion about how to adhere to functional programming ideals while still programming in Java
