deanwampler

case class Error[E,A](e:Either[E,A])  {
   
    def flatMap[B](f:A => Error[E,B]):Error[E,B] ={
      Error(e.right.flatMap(a=> f(a).e))
    }
    def map[B](f:A=>B):Error[E,B]={
      Error(e.right.map(f))
    }
  }
object ErrorUtils{

deanwampler

object looksLikeAFunction{
  def apply(s:String):Int=1
}
object nowAFunction extends Function[String,Int]{
  def apply(s:String):Int=1
}

object TestMethods {
   implicit def  functionToAnother(f:Function[String,Int]):Function[Int,String] = 
                                                          (i:Int)=> f(i.toString()).toString()

deanwampler

// When you run "scala colors.scala", it's like you compiled the following script,
// where the contents of colors.scala is embedded inside the "new Anyref {...}".
object Script {
  def main(args: Array[String]): Unit = {
    new AnyRef {
      // If you change "object" to "class" and remove the
      // "type Color = Value" declaration, it compiles.
      class Color extends Enumeration {
        type Color = Value
        val Empty  = Value

deanwampler

case class Point(x: Int, y: Int) {
  require(x >= 0)
  require(y >= 0)
}

case class Piece(ps: Set[Point]) {
  def flip = {
    val mx = spanx
    Piece(ps.map(p => Point(mx - p.x, p.y)))
  }

deanwampler

import javax.swing.SwingWorker

class A {
  def loadAll(f:(Int) => List[String]): List[String] = List("a")
  def getFriendsIds(page: Int): List[String] = List("a")
  def getFollowersIds(page: Int): List[String] = List("a")
}

class B {
  def setFollowers(followers: List[String]) {}

deanwampler

class MySwingWorker extends SwingWorker[List[TwitterUserId], Object](ids: List[String]) {
  def doInBackground = twitterSession.loadAll(ids)
  override def done = streams.setFollowerIds(get map (_.id.toString()))
}

(new MySwingWorker(twitterSession.getFollowersIds)).execute
(new MySwingWorker(twitterSession.getFriendsIds)).execute

deanwampler

/**
 * http://gist.github.com/161702.
 * Start with this Groovy example, http://gist.github.com/160492
 * and Scala variants suggested by others, http://gist.github.com/161159
 * and http://gist.github.com/162389
 * 
 * Here is what I came up with, but it's somewhat different. The others assume 
 * that Cucumber will parse the regex's and invoke the anonymous function 
 * specified with the Given declaration. The problem is that it's difficult to
 * define a generic function signature. 

deanwampler

# Not clear in the rdocs what the behavior will be when you pass nil!
def foo(val = nil)
  val ||= "default"
end

# This one provides much better documentation to the reader, especially "rdocs"
# (At least, I *think* rdocs show the default values...)
def bar(val = "default")
  val
end