Beginning Scala Talk by David Pollak at Silicon Valley Code Camp
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The document summarizes Scala, a functional programming language that runs on the Java Virtual Machine (JVM). It discusses Scala's core features like being object-oriented, type inference, and support for functional programming with immutable data structures and passing functions as parameters. It also provides examples of using Scala collections like List and Array, and functions like map, filter, flatMap, and foldLeft/reduceLeft. Finally, it demonstrates using Scala for domain-specific languages and shows examples of defining DSLs for querying and generating JavaScript.
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Beginning Scala Talk by David Pollak at Silicon Valley Code Camp
- 1. Beginning Scala David Pollak Silicon Valley Code Camp October 3rd, 2009
- 3. Lead developer for Lift web framework
- 4. Scala since November 2006, Ruby/Rails, Java/J2EE
- 5. Spreadsheet junky (writing more than using)
- 6. Wrote Beginning Scala
- 9. 100% compatible with Java objects
- 11. Type inferencing
- 12. Super-easy to pass functions as parameters
- 13. Scala in the Wild
- 14. At the command line
- 16. Linked List of type T (String, Int, FooClass)
- 18. Thin veneer on JVM Array
- 19. Lots of methods (map, filter, toList, etc.)
- 20. Collections
- 22. Return a new collection containing the result
- 24. Return a new collection containing items that passed
- 25. map & filter
- 27. Useful for nesting operations on collections
- 28. "99 red balloons".toList List[Char] = List(9, 9, , r, e,...)
- 29. List("99 red balloons", "88 lines", "44 women"). flatMap(s => s.filter(Character.isDigit)) List[Char] = List(9, 9, 8, 8, 4, 4)
- 31. Good for: sum, product, etc.
- 32. List(1,2,3,4).reduceLeft(_ + _) Int = 10
- 33. def sq(in: Int) = in * in def sum(in: List[Int]) = in.foldLeft(0)(_ + _) def sumSq(in: List[Int]) = sum(in.map(sq)) def sqSum(in: List[Int]) = sq(sum(in))
- 38. SetValById(inputName, "") & SetValById(hiddenName, "") & SetElemById(clrLinkName, "none", "style.display")
- 39. <button onclick={ jsonCall("submit", JsArray(ValById(inputName), ValById(hiddenName)))}>Yep</button>
- 41. def find(by: QueryParam[A]*) abstract class QueryParam[A<:Mapper[A]] case class Cmp[A<:Mapper[A], T](...) extends QueryParam[A] object By { import OprEnum._ def apply[O <: Mapper[O], T, U <% T](...) = Cmp[O,T](field, Eql, Full(value), Empty)
- 43. trait JsCmd extends HtmlFixer with ToJsCmd { def &(other: JsCmd): JsCmd = JsCmds.CmdPair(this, other) def toJsCmd: String }