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  1. import Stream._
  2. trait Stream[+A]
  3.  
  4. case object Empty extends Stream[Nothing]
  5. case class Cons[+A](h: () => A, t: () => Stream[A]) extends Stream[A]
  6.  
  7. object Stream {
  8.   def constant[A](a: A): Stream[A] = { 
  9.     lazy val tail: Stream[A] = Cons(() => a, () => tail)
  10.     tail
  11.   }
  12. }
  13.  
  14. object Main extends App {
  15.   println(constant(5))
  16.  
  17. }
Success #stdin #stdout 0.39s 382016KB
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Standard input is empty
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Cons(<function0>,<function0>)
https://ideone.com/QCm6Vv
language:
Scala (scala 2.12.8)
created:
9 years ago
visibility:
public

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