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Yehor Lvivski @lvivski
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The Dart side of the Moon
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class-based single inheritance object-oriented
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History
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Oct 11, 2011 Apr 16, 2013 Summer 2013
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M1, July 2012 • No explicit interfaces • No `+` on Strings • Cascades `o..method()`
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M2, December 2012 • Better Dart2js • PUB • Better libraries API
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M3, February 2013 • Streams API • Lazy Iterators
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M4, April 2013 Stability!
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Who’s behind?
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Why?
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Performance
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main(){}! Tree shaking Classes and Interfaces Optional types Concurrency Operator overloading Optional and Named arguments Lightweight syntax
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It’s not a syntax sugar
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Standalone VM Browser integrated VM dart2js Compiler
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How it works
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Is it even possible?
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Generated code is faster, than handwritten. Prototype-less code is faster, than Prototype chains. Inlined functions, are faster too ;)
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Laziness
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Laziness • map()! • where() (filter analogue) • expand()!
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Streams Reactive Programming
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Streams • emit a repeating series of events (such as messages, file data, user clicks) • single- or multi-subscriber • methods to take partial data (first, take, skip...) • check data (contains, any, every) • transform
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Streams are Everywhere • Iterators (List, Queue, Set) • IO (File, HTTP) • Events
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Infrastructure
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Editors
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Package manager
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Components
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Dart Web UI Package
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Demo time!
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Links • h'p://www.dartlang.org • h'p://github.com/dart-‐lang/web-‐ui • h'p://github.com/lvivski – speaker, start, hart, gloss, quart, archer Thanks