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davidandrzej/lazy.scala

Created May 25, 2012 03:36
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Laziness, side-effects / mutability, and short-circuiting: a cautionary tale
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lazy.scala
scala> val mutant = collection.mutable.ListBuffer[Int]()
mutant: scala.collection.mutable.ListBuffer[Int] = ListBuffer()
scala> (0 until 4).view.map{idx => {
mutant.append(idx); idx > 0}}.exists(identity)
res3: Boolean = true
scala> mutant
res4: scala.collection.mutable.ListBuffer[Int] =
ListBuffer(0, 1)
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