manjuraj

//
// References
// - http://jim-mcbeath.blogspot.com/2008/11/scala-type-infix-operators.html
//

//
// Notes:
// - a generic type op[T1, T2] can be written T1 op T2
//

manjuraj

//
// References
// - http://stackoverflow.com/questions/3427345/what-do-and-mean-in-scala-2-8-and-where-are-they-documented
// - http://stackoverflow.com/questions/2603003/operator-in-scala
// - https://gist.github.com/retronym/229163
// - http://debasishg.blogspot.com/2010/08/using-generalized-type-constraints-how.html#sthash.GKfUGq9p.dpuf
// - http://www.scala-lang.org/old/node/4041.html
// - https://groups.google.com/forum/#!searchin/scala-user/generic$20type$20constraint/scala-user/mgx9-TUapQo/tiN6x818dKsJ

//

manjuraj

// References
// Ordering case classes: http://meta.plasm.us/posts/2013/10/13/ordering-case-classes/
// Tuple Ordering available up to 9 arity - https://github.com/scala/scala/blob/v2.10.2/src/library/scala/math/Ordering.scala#L358

manjuraj

//
// Semigroup with a associative binary method `append`, subject
// to semigroup laws
//
// A Semigroup in type F must satisfy two laws:
// - closure: ∀ a, b in F, append(a, b) is also in F. This is
//   enforced by the type system
// - associativity: ∀ a, b, c in F, the following equation holds
//   => append(append(a, b), c) = append(a, append(b , c))
//

manjuraj

//
// References: 
// - http://www.tikalk.com/java/type-safe-builder-scala-using-type-constraints/
// - http://www.blumenfeld-maso.com/2011/05/statically-controlling-calls-to-methods-in-scala/
// - http://dcsobral.blogspot.com/2009/09/type-safe-builder-pattern.html
// - http://blog.rafaelferreira.net/2008/07/type-safe-builder-pattern-in-scala.html
// - http://jim-mcbeath.blogspot.com/2009/09/type-safe-builder-in-scala-part-4.html
// - http://villane.wordpress.com/2010/03/05/taking-advantage-of-scala-2-8-replacing-the-builder/
// - http://debasishg.blogspot.com/2010/08/using-generalized-type-constraints-how.html#sthash.GKfUGq9p.dpuf
//

manjuraj

//
// Show typeclass parameterized on a concrete type
//
trait Show[A] {
  def show(a: A): String
}

object Show {
  implicit object StringShow extends Show[String] {
    def show(s: String) = s"*$s*"

manjuraj

// https://github.com/twitter/util/blob/master/util-app/src/main/scala/com/twitter/app/Flag.scala

// Type class / Typeclass / Type traits 

// References
// - http://www.haskell.org/haskellwiki/Typeclassopedia
// - http://www.haskell.org/wikiupload/8/85/TMR-Issue13.pdf
// - https://github.com/channingwalton/typeclassopedia
// - http://ropas.snu.ac.kr/~bruno/papers/TypeClasses.pdf
// - http://debasishg.blogspot.com/2010/06/scala-implicits-type-classes-here-i.html

manjuraj

// http://stackoverflow.com/questions/5328007/why-doesnt-option-have-a-fold-method
// See scalaz option cata()
// 
// fold[B](ifEmpty: => B)(f: A => B): B

http://www.blumenfeld-maso.com/2010/01/scala-word-of-the-day-catamorphism/

manjuraj

import com.fasterxml.jackson.core.{JsonGenerator, JsonToken, JsonParser, JsonFactory}
import com.fasterxml.jackson.databind._

val mapper = new ObjectMapper
val jsonFactory = new JsonFactory(mapper)
val content =
  """
  {
    "name" : "Watership Down",
    "location" : {

manjuraj

import java.util.{Map ⇒ JMap}
import java.util.{List ⇒ JList}