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object Test extends App {
def testTakeWhile = {
val numbers = Iterator.range(0, 50)
val zeroTo9 = numbers.takeWhile(x => { println("p(" + x + ")"); x < 10 } )
zeroTo9.foreach(println _)
val zeroTo1 = Iterator.range(0, 20).takeWhile(x => { println("p(" + x + ")"); x < 2 } )
println(zeroTo1.hasNext)
println(zeroTo1.hasNext)
println(zeroTo1.next)
println(zeroTo1.hasNext)
println(zeroTo1.next)
println(zeroTo1.hasNext)
println(zeroTo1.hasNext)
}
def testFilter = {
val predicate = (x: Int) => { println("p(" + x + ")"); x % 2 == 0 }
val evens = Iterator.range(0, 10).filter(predicate)
println(evens.hasNext)
println(evens.hasNext)
println(evens.next)
evens.foreach(println _)
}
testTakeWhile
testFilter
}
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