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on 12-Sep-2014 (Fri)

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Flashcard 149631244

Tags
#odersky-programming-in-scala-2ed #scala
Question
How can you simplify this class?

class ArrayElement(conts: Array[String]) extends Element {
  val contents: Array[String] = conts
}
Answer
Create a parametric field:

class ArrayElement(
  val contents: Array[String]
) extends Element


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Flashcard 149632101

Tags
#odersky-programming-in-scala-2ed #scala
Question
How come an abstract method can call super? It would certainly fall for classes.

trait Doubling extends IntQueue {
  abstract override def put(x: Int) { super.put(2 * x) }
}
Answer
Since super calls in a trait are dynamically bound, the super call in trait Doubling will work so long as the trait is mixed in after another trait or class that gives a concrete definition to the method.


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Flashcard 149632691

Tags
#odersky-programming-in-scala-2ed #scala
Question
How can I write import p.n using full import selectors?
Answer
import p.{n}


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Flashcard 149632789

Tags
#odersky-programming-in-scala-2ed #scala
Question
What does access modifier private[this] mean? Is it more or less restrictive than private ?
Answer
It is more restrictive, because it allows access only from the same object. Same class, different object is not allowed (think: typical implementation of equals() in Java has this.x == that.x; it wouldn't work with private[this] in Scala)


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