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@ case class Cross[T](items: T*){ | |
def flatMap[V](f: T => Cross[V]): Cross[(T, V)] = { | |
val flattened = for{ | |
i <- items | |
k <- f(i).items | |
} yield (i, k) | |
Cross(flattened:_*) | |
} | |
def map[V](f: T => V): Cross[(T, V)] = { | |
Cross(items.map(i => i -> f(i)):_*) | |
} | |
def withFilter(f: T => Boolean) = { | |
Cross(items.filter(f):_*) | |
} | |
} | |
defined class Cross | |
@ for(a <- Cross(1, 2, 3)) yield a.toString | |
res15: Cross[(Int, String)] = Cross(ArrayBuffer((1, "1"), (2, "2"), (3, "3"))) | |
@ for{ | |
a <- Cross(1, 2) | |
b <- Cross("A", "B") | |
if !(a == 2 && b == "B") | |
} yield b * a | |
res16: Cross[(Int, (String, String))] = Cross( | |
ArrayBuffer((1, ("A", "A")), (1, ("B", "B")), (2, ("A", "AA"))) | |
) |
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