JScala allows writing JavaScript code in Scala by using Scala macros to transform Scala code into valid JavaScript syntax and structure, providing type safety and preventing boilerplate code while writing in a single language. It supports common JavaScript features like variables, functions, classes, and libraries through the Scala syntax and type system.

1. JScala
Write you JavaScript in Scala.
Let it be type safe!
Alexander Nemish
@atlanter

2. What is JScala?
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JavaScript AST
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Scala macros
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JavaScript pretty printer
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Macro annotations
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Typescript import

3. Why JScala?
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Type safety
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IDE support
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Modularity
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Single language
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No boilerplate

4. Example

5. Example

6. Features
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Variables, functions, lambdas
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if, for, for..in, while, match, try/throw
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classes, traits, inheritance
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Array/Traversable, Map
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JsDynamic
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Injection

7. Manual AST

8. Macro example

9. Generated JavaScript

10. Show Tetris

11. Server code

12. Client code

13. Generated JavaScript

14. Show AES web app

15. @Typescripted

16. JScala Cons
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Subset of Scala
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Covers only basic parts of the library
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Uses experimental Scala features

17. Thank you!
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http://jscala.org
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https://github.com/nau/jscala
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https://github.com/apezel/ts2scala
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Google Group: jscala-user
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Follow me on twitter: @atlanter
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Email: anemish@gmail.com