Converting immutable to mutable collections
scala> var a=collection.mutable.Set[Int](1,2,3)
a: scala.collection.mutable.Set[Int] = Set(1, 2, 3)
scala> var b=collection.immutable.Set[Int](1,2,3)
b: scala.collection.immutable.Set[Int] = Set(1, 2, 3)
scala> collection.mutable.Set(b.toArray:_*)
res0: scala.collection.mutable.Set[Int] = Set(1, 2, 3)
scala> collection.mutable.Set(b.toSeq:_*)
res1: scala.collection.mutable.Set[Int] = Set(1, 2, 3)
scala> collection.mutable.Set(b.toList:_*)
res2: scala.collection.mutable.Set[Int] = Set(1, 2, 3)
Starting Scala 2.13
, via factory builders applied with .to(factory)
:
Set(1, 2, 3).to(collection.mutable.Set)
// collection.mutable.Set[Int] = HashSet(1, 2, 3)
Prior to Scala 2.13
and starting Scala 2.10
:
Set(1, 2, 3).to[collection.mutable.Set]
// collection.mutable.Set[Int] = Set(1, 2, 3)