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Created March 7, 2014 11:36
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learning scala
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learning_scala.md

march 6, 2014

What's the difference between val and var?

  • A val variable can not have it's value changed, but a var variable can.

march 7, 2014

What's the deal with implicit val?

  • Marking a value as implicit allows it to be used by functions that accept implicit parameters.
  def fn(x: Int)(implicit y: Boolean) = if(y) x else - x

  fn(1)(true) // returns 1
  implicit val b = false
  fn(1) // returns -1 using b as the argument for the implicit argument
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