10-3 集合之Set

scala> val s1 = Set(1,2,3,4)
s1: scala.collection.Set[Int] = Set(1, 2, 3, 4)

scala> val s2 = Set(3,4,5,6)
s2: scala.collection.Set[Int] = Set(3, 4, 5, 6)

交集

scala> s1 & s2
res78: scala.collection.Set[Int] = Set(3, 4)

scala> s1 intersect s2
res79: scala.collection.Set[Int] = Set(3, 4)

并集

scala> s1 | s2
res80: scala.collection.Set[Int] = Set(5, 1, 6, 2, 3, 4)

scala> s1 union s2
res81: scala.collection.Set[Int] = Set(5, 1, 6, 2, 3, 4)

scala> s1++ s2
res91: scala.collection.Set[Int] = Set(5, 1, 6, 2, 3, 4)

差集

scala> s1 -- s2
res86: scala.collection.Set[Int] = Set(1, 2)

scala> s1 &~ s2
res89: scala.collection.Set[Int] = Set(1, 2)

scala> s1 diff s2
res90: scala.collection.Set[Int] = Set(1, 2)