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object Test {
val failer = () => { println("fail") ; None }
val succeeder = () => { println("success") ; Some(5) }
val fs = List(failer, succeeder, failer, failer, succeeder, failer, failer, failer, succeeder)
def f0 = fs.view flatMap (f => f())
def f1 = f0.headOption
def f2 = f0.head
def f3 = f0.lastOption
def f4 = f0.last
def main(args: Array[String]): Unit = {
println("f1: " + f1)
println("f2: " + f2)
println("f3: " + f3)
println("f4: " + f4)
}
}
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