Scala.js - yet another what..?
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The document discusses Scala.js, a tool for building large applications in JavaScript using Scala. It highlights examples of Scala.js functionality, such as creating JavaScript functions and managing dependencies, while addressing common issues related to transpilers and compilation. The document concludes with remarks on the strengths and weaknesses of Scala.js, its potential for future development, and relevant resources.
![@JSExport
object Client extends js.JSApp{
@JSExport
def main(container: html.Div) = {
val inputBox = input.render
val outputBox = ul.render
def update() = Ajaxer[Api].post("/ajax/list", inputBox.value).foreach{ data =>
(Business Logic on Strongly typed operations)
}
}
}](https://image.slidesharecdn.com/scala-150702200656-lva1-app6891/85/Scala-js-yet-another-what-54-320.jpg)
Scala.js - yet another what..?
- 1. Scala.js Yet Another What... ? Created by /Artur Skowroński @arturskowronski
- 10. Opal (Rb 2 JS)
- 11. CobolScript
- 12. Brainfuck.js
- 13. Scala.js
- 20. Example 1
- 21. object ScalaJSExample extends js.JSApp{ def main() = { var x = 0 while(x < 999){ x = x + "2".toInt } println(x) } }
- 22. ScalaJS.c.Lexample_ScalaJSExample$.prototype.main__V = (function() { var x = 0; while ((x < 999)) { var jsx$1 = x; var this$2 = new ScalaJS.c.sci_StringOps().init___T("2"); var this$4 = ScalaJS.m.jl_Integer$(); var s = this$2.repr$1; x = ((jsx$1 + this$4.parseInt__T__I__I(s, 10)) | 0) }; var x$1 = x; var this$6 = ScalaJS.m.s_Console$(); var this$7 = this$6.outVar$2; ScalaJS.as.Ljava_io_PrintStream(this$7.tl$1.get__O()).println__O__V(x$1) });
- 24. Example 2
- 25. object ScalaJSExample extends js.JSApp{ def main() = {} def exported = {} def exported2 = {} }
- 26. @JSExport
- 27. object ScalaJSExample extends js.JSApp{ def main() = {} @JSExport def exported() = {} @JSExport def exported2() = {} }
- 28. <script> oursample.ScalaJSExample().exported(); oursample.ScalaJSExample().exported2(); </script>
- 30. @JSName
- 31. object ScalaJSExample extends js.JSApp{ def main() = {} @JSExport def exported() = {} @JSExport def exported2() = {} @JSExport @JSName('val') def valueOfObject() = {} }
- 34. SBT Plugin
- 35. addSbtPlugin("org.scala-js" % "sbt-scalajs" % "0.6.0")
- 37. compile
- 38. Initial Compilation: .scala files to .class and .sjsir files
- 39. package
- 40. fastOptJs
- 41. Fast Optimization: .sjsir files to one smallish/fast .js file
- 43. Full Optimization: .sjsir files to one smaller/faster .js file Clojure Compiler
- 44. run
- 45. object RunMe extends js.JSApp{ def main(): Unit = { println("Hello World!") } }
- 46. Hello World!
- 48. test
- 49. Source Maps
- 50. Example 3
- 51. @JSExport object Client extends js.JSApp{ @JSExport def main(container: html.Div) = { val inputBox = input.render val outputBox = ul.render def update() = Ajax.post("/ajax/list", inputBox.value).foreach{ xhr => def response = xhr.responseText (Raw Json Operation) } } }
- 53. autowire
- 54. @JSExport object Client extends js.JSApp{ @JSExport def main(container: html.Div) = { val inputBox = input.render val outputBox = ul.render def update() = Ajaxer[Api].post("/ajax/list", inputBox.value).foreach{ data => (Business Logic on Strongly typed operations) } } }
- 56. Quirks
- 61. Conclusion
- 63. Strenghts Strongly Typed IDE Autocompletion Better know language (for Scala Dev) Single Language Codebase
- 64. Weaknes Big Result Files Harder Debugging Don't part of JS Ecosystem Lack of Support to many libraries (fe. Akka and Guice) Performance payoffs and don't able to perfomance by hand
- 65. Opportunities Our Holy Grail :) More Scalable Codebase Chances to more library support in future Creators promise better performance
- 66. Treats / Concerns Project will loose interests and support Every Abstraction Leaks :(
- 68. Thank You