JScalaWrite you JavaScript in Scala.

Let it be type safe!

Alexander Nemish @atlanter

What is JScala?

• JavaScript AST

• Scala macros

• JavaScript pretty printer

• Macro annotations

• Typescript import

Why JScala?

• Type safety

• IDE support

• Modularity

• Single language

• No boilerplate

Example

Example

Features• Variables, functions, lambdas

• if, for, for..in, while, match, try/throw

• classes, traits, inheritance

• Array/Traversable, Map

• JsDynamic

• Injection

Manual AST

Macro example

Generated JavaScript

Show Tetris

Server code

Client code

Generated JavaScript

Show AES web app

@Typescripted

JScala Cons

• Subset of Scala

• Covers only basic parts of the library

• Uses experimental Scala features

Thank you!• http://jscala.org

• https://github.com/nau/jscala

• https://github.com/apezel/ts2scala

• Google Group: jscala-user

• Follow me on twitter: @atlanter

• Email: anemish@gmail.com