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