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Tags
#odersky-programming-in-scala-2ed #scala
Question
Why won't this compile? 

class Rational(n: Int, d: Int) { // This won’t compile
  require(d != 0)
  override def toString = n +"/"+ d
  def add(that: Rational): Rational =
  new Rational(n * that.d + that.n * d, d * that.d)
}
Answer
Because n and d can only be accessed in methods for this object - they seem to be captured like in closure for toString. They are not fields / members though

Tags
#odersky-programming-in-scala-2ed #scala
Question
Why won't this compile? 

class Rational(n: Int, d: Int) { // This won’t compile
  require(d != 0)
  override def toString = n +"/"+ d
  def add(that: Rational): Rational =
  new Rational(n * that.d + that.n * d, d * that.d)
}
Answer
?

Tags
#odersky-programming-in-scala-2ed #scala
Question
Why won't this compile? 

class Rational(n: Int, d: Int) { // This won’t compile
  require(d != 0)
  override def toString = n +"/"+ d
  def add(that: Rational): Rational =
  new Rational(n * that.d + that.n * d, d * that.d)
}
Answer
Because n and d can only be accessed in methods for this object - they seem to be captured like in closure for toString. They are not fields / members though
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statusnot learnedmeasured difficulty37% [default]last interval [days]               
repetition number in this series0memorised on               scheduled repetition               
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