Scala notes.scala

// Random ASCII
def randomString(length: Int) = scala.util.Random.alphanumeric.take(length).mkString

//signum
def signum[T: Numeric](v: T) : Int = {
  val v1 = implicitly[Numeric[T]].toLong(v)
  if(v1 > 0 ) 1 else if(v1 < 0 ) -1 else 0
}
print(signum(1.2))
print(signum(BigInt(2).pow(1029)))

/**
* Come up with one situation where the assignment x = y = 1 is valid in Scala. 
* (Hint: Pick a suitable type for x.)
*/
// #1
var y = 2
var x = y = 1
// #2
var x:Unit = {}
var y = 0
x = y = 1

/**
 * Write a Scala equivalent for the Java loop
 * for (int i = 10; i >= 0; i--) System.out.println(i);
 */
for (i<- (0 to 10).reverse) println(i)
for (i <- 10.to(0, -1)) println(i)
(0 to 10).reverse.foreach(println)

def countdown(n: Int): Unit ={
  for(i<- (0 to n).reverse) println(i)
}