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Devoxx uk lambdas hackday
Devoxx uk lambdas hackday
Devoxx uk lambdas hackday
Devoxx uk lambdas hackday
Devoxx uk lambdas hackday
Devoxx uk lambdas hackday
Devoxx uk lambdas hackday
Devoxx uk lambdas hackday
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Devoxx uk lambdas hackday

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Brief introductory presentation, for the Lambdas Hackday at DevoxxUK

Brief introductory presentation, for the Lambdas Hackday at DevoxxUK

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Transcript

  • 1. Higher Order Lab Richard Warburton Stuart Marks Maurice Naftalin Graham Allan John Oliver
  • 2. Why are we here?● Learn about lambda expressions and collections● Feedback on the new API● Have fun
  • 3. Whats on the USB Stick?● OpenJDK binaries with lambda support ○ Windows ○ Mac ○ Linux● Javadoc for the new API● IDEs with Support ○ Idea ○ Netbeans
  • 4. Expectations● You have a laptop ○ or a friend with a laptop!● Youve been to a lambdas talk ... ○ "Lambdas and Collections in Java 8" ○ "Accelerated Lambda Programming"● ... or you know the basics already
  • 5. Whos WhoInstructors: put up your hands!
  • 6. What should we focus on● At first just write the basics● Revamped collections methods ○ flatMap() ○ reduce()● Collect Changes: ○ into(new ArrayList<>()) => collect(toList()) ○ groupBy(classifier) => collect(groupingBy(classifier))
  • 7. Exercise Ideas:● Sort a list of strings alphabetically within length.● Count number of words in a document ○ http://www.gutenberg.org● Implement sum and average of command- line arguments● Count word frequency in a document ○ maybe without loading the entire document into memory?● Feedback @ bit.ly/14iINWi● github.com/AdoptOpenJDK/Lambdas
  • 8. Any Questions? Feedback @ bit.ly/14iINWigithub.com/AdoptOpenJDK/Lambdas

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