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Devoxx uk lambdas hackday

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This document outlines an agenda for a higher order lab focusing on lambda expressions and collections in Java 8. The lab will provide OpenJDK binaries, Javadoc, and IDE support for working with the new API. Attendees are expected to have basic knowledge of lambdas and functional programming concepts. The lab will demonstrate revamped collection methods like flatMap and reduce, and changes to existing methods. Exercise ideas are provided to sort and filter collections, count words in documents, and implement common functions. Attendees are invited to provide feedback.

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Higher Order Lab Richard Warburton Stuart Marks Maurice Naftalin Graham Allan John Oliver

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Why are we here? ● Learn about lambda expressions and collections ● Feedback on the new API ● Have fun

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What's on the USB Stick? ● OpenJDK binaries with lambda support ○ Windows ○ Mac ○ Linux ● Javadoc for the new API ● IDEs with Support ○ Idea ○ Netbeans

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Expectations ● You have a laptop ○ or a friend with a laptop! ● You've been to a lambdas talk ... ○ "Lambdas and Collections in Java 8" ○ "Accelerated Lambda Programming" ● ... or you know the basics already

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Who's Who Instructors: put up your hands!

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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))

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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

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Any Questions? Feedback @ bit.ly/14iINWi github.com/AdoptOpenJDK/Lambdas

More Related Content

Devoxx uk lambdas hackday

  • 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. What's 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! ● You've been to a lambdas talk ... ○ "Lambdas and Collections in Java 8" ○ "Accelerated Lambda Programming" ● ... or you know the basics already
  • 5. Who's Who Instructors: 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/14iINWi github.com/AdoptOpenJDK/Lambdas