Introduction to functional programming with java 8

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Recently gave a presentation in a Java Meetup in Bangalore on basics of functional programming, new functional features in Java 8, and introduction to the basic concepts of functional interfaces and lambda expressions...

Copyright © 2014-2016 JavaBrahman.com
Introduction
to
Functional Programming
with Java-8
Dhruv Rai Puri
JavaBrahman.com

Copyright © 2014-2016 JavaBrahman.com
HELLO!
I am Dhruv Rai Puri
I am a Java Architect and run the technical blog JavaBrahman.com
You can reach me at
dhruvraipuri@javabrahman.com
Twitter~ @javabrahman
facebook.com/JavaBrahman
plus.google.com/+JavaBrahman

Copyright © 2014-2016 JavaBrahman.com
Whats going to be covered in this presentation
› Functional Programming
» What is functional programming
» How it’s different from imperative programming
› Important New Features in Java 8
› Functional Interfaces
› Lambda Expressions

Copyright © 2014-2016 JavaBrahman.com
What is Functional Programming
Focusses on
WHAT
is to be done
Subset of Declarative Style of Programming

Copyright © 2014-2016 JavaBrahman.com
Functional V/S Imperative
Programming
Style of Coding
Flow Control Mechanisms
Order of Execution Mutability of Variables
Primary Language Structures
Functions as 1st Class Objects
For in-depth understanding refer:
http://www.javabrahman.com/programming-principles/imperative-versus-functional-programming-paradigms-conceptual/

Copyright © 2014-2016 JavaBrahman.com
New Functional Features in Java – 8
Lambda Expressions
Eg:(String param)->{System.out.println("My lambda says "+param);};
Functional Interfaces
Eg: @FunctionalInterface
public interface Predicate<T> {
boolean test(T t);
}
(cont…)

Copyright © 2014-2016 JavaBrahman.com
New Functional Features in Java – 8(cont…)
Streams API
Eg: List filteredList = employeeList.stream()
.limit(2)
. collect(toList());
Method References
Eg: Function doubleConvertor=Double::parseDouble;
Constructor Reference: <ClassName>::new
For learning all new features in Java-8 refer:
http://www.javabrahman.com/java-8/new-features-in-java-8/

Copyright © 2014-2016 JavaBrahman.com
Functional Interfaces
› interface which has only a single abstract method
3 Types of functional interfaces
public interface CustomFunctionalInterface {
public void firstMethod();
}
1› Custom or User Defined
(cont…)

Copyright © 2014-2016 JavaBrahman.com
Functional Interfaces(cont..)
For learning in-depth about functional interfaces refer:
http://www.javabrahman.com/java-8/functional-interfaces-java-8/
//java.util.function.Predicate<T>
@FunctionalInterface
public interface Predicate<T> {
boolean test(T t);
}
2› Newly defined functional interfaces in Java 8
@FunctionalInterface
public interface Runnable {
public abstract void run();
}
3› Pre-existing functional interfaces in Java

Copyright © 2014-2016 JavaBrahman.com
Lambda Expressions
For learning in-depth about lambda expressions refer:
http://www.javabrahman.com/java-8/lambda-expressions-java-8-explained-examples/
› anonymous function which can be passed around as a
parameter thus achieving Behavior Parameterization
@FunctionalInterface
public interface FirstInterface {
//the abstract method
public void singleMethod(String param);
}
(String param)->{System.out.println("My lambda says "+param);};
Functional Interface
Corresponding Lambda Expressions

Copyright © 2014-2016 JavaBrahman.com
Q & A

Copyright © 2014-2016 JavaBrahman.com
For further reading on Java-8
 http://www.javabrahman.com/java-8/new-features-in-java-8/
 http://www.javabrahman.com/java-8/functional-interfaces-java-8/
 http://www.javabrahman.com/java-8/lambda-expressions-java-8-explained-examples/
 http://www.javabrahman.com/java-8/java-8-method-references-tutorial-examples/
 http://www.javabrahman.com/java-8/constructor-references-java-8-simplified-tutorial/
 http://www.javabrahman.com/java-8/java-8-streams-api-tutorial-with-examples/

Copyright © 2014-2016 JavaBrahman.com
Thank You

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Introduction to functional programming with java 8

2. Copyright © 2014-2016 JavaBrahman.com HELLO! I am Dhruv Rai Puri I am a Java Architect and run the technical blog JavaBrahman.com You can reach me at [email protected] Twitter~ @javabrahman facebook.com/JavaBrahman plus.google.com/+JavaBrahman

3. Copyright © 2014-2016 JavaBrahman.com Whats going to be covered in this presentation › Functional Programming » What is functional programming » How it’s different from imperative programming › Important New Features in Java 8 › Functional Interfaces › Lambda Expressions

5. Copyright © 2014-2016 JavaBrahman.com Functional V/S Imperative Programming Style of Coding Flow Control Mechanisms Order of Execution Mutability of Variables Primary Language Structures Functions as 1st Class Objects For in-depth understanding refer: http://www.javabrahman.com/programming-principles/imperative-versus-functional-programming-paradigms-conceptual/

6. Copyright © 2014-2016 JavaBrahman.com New Functional Features in Java – 8 Lambda Expressions Eg:(String param)->{System.out.println("My lambda says "+param);}; Functional Interfaces Eg: @FunctionalInterface public interface Predicate<T> { boolean test(T t); } (cont…)

7. Copyright © 2014-2016 JavaBrahman.com New Functional Features in Java – 8(cont…) Streams API Eg: List filteredList = employeeList.stream() .limit(2) . collect(toList()); Method References Eg: Function doubleConvertor=Double::parseDouble; Constructor Reference: <ClassName>::new For learning all new features in Java-8 refer: http://www.javabrahman.com/java-8/new-features-in-java-8/

8. Copyright © 2014-2016 JavaBrahman.com Functional Interfaces › interface which has only a single abstract method 3 Types of functional interfaces public interface CustomFunctionalInterface { public void firstMethod(); } 1› Custom or User Defined (cont…)

9. Copyright © 2014-2016 JavaBrahman.com Functional Interfaces(cont..) For learning in-depth about functional interfaces refer: http://www.javabrahman.com/java-8/functional-interfaces-java-8/ //java.util.function.Predicate<T> @FunctionalInterface public interface Predicate<T> { boolean test(T t); } 2› Newly defined functional interfaces in Java 8 @FunctionalInterface public interface Runnable { public abstract void run(); } 3› Pre-existing functional interfaces in Java

10. Copyright © 2014-2016 JavaBrahman.com Lambda Expressions For learning in-depth about lambda expressions refer: http://www.javabrahman.com/java-8/lambda-expressions-java-8-explained-examples/ › anonymous function which can be passed around as a parameter thus achieving Behavior Parameterization @FunctionalInterface public interface FirstInterface { //the abstract method public void singleMethod(String param); } (String param)->{System.out.println("My lambda says "+param);}; Functional Interface Corresponding Lambda Expressions

12. Copyright © 2014-2016 JavaBrahman.com For further reading on Java-8  http://www.javabrahman.com/java-8/new-features-in-java-8/  http://www.javabrahman.com/java-8/functional-interfaces-java-8/  http://www.javabrahman.com/java-8/lambda-expressions-java-8-explained-examples/  http://www.javabrahman.com/java-8/java-8-method-references-tutorial-examples/  http://www.javabrahman.com/java-8/constructor-references-java-8-simplified-tutorial/  http://www.javabrahman.com/java-8/java-8-streams-api-tutorial-with-examples/

Introduction to functional programming with java 8

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