Scala BitSet

Scala BitSet is a collection type that implements the BitSet data structure. A BitSet represents a collection of bits and provides efficient methods for manipulating the bits. It is very useful for optimizing memory usage and for performing bitwise operations.

Creating a BitSet

A BitSet can be created in several ways. The most common way is to create an empty BitSet using the BitSet() constructor:

val bitSet: BitSet = BitSet()

A BitSet can also be created from a collection of integers:

val integers: Seq[Int] = Seq(1, 4, 5)
val bitSet: BitSet = BitSet(integers: _*)

Adding and removing elements

To add an element to a BitSet, use the += operator:

bitSet += 3

To remove an element from a BitSet, use the -= operator:

bitSet -= 4

Operations on BitSets

Union

To perform a union operation between two BitSets, use the | operator:

val bitSet1: BitSet = BitSet(1, 2, 3)
val bitSet2: BitSet = BitSet(3, 4, 5)
val union: BitSet = bitSet1 | bitSet2
// union: scala.collection.immutable.BitSet = BitSet(1, 2, 3, 4, 5)

Intersection

To perform an intersection operation between two BitSets, use the & operator:

val bitSet1: BitSet = BitSet(1, 2, 3)
val bitSet2: BitSet = BitSet(3, 4, 5)
val intersection: BitSet = bitSet1 & bitSet2
// intersection: scala.collection.immutable.BitSet = BitSet(3)

Difference

To perform a difference operation between two BitSets, use the &~ operator:

val bitSet1: BitSet = BitSet(1, 2, 3)
val bitSet2: BitSet = BitSet(3, 4, 5)
val difference: BitSet = bitSet1 &~ bitSet2
// difference: scala.collection.immutable.BitSet = BitSet(1, 2)

Conclusion

Scala BitSet is a powerful collection type for storing and manipulating sets of bits. It provides efficient methods for adding and removing elements, as well as for performing union, intersection, and difference operations on sets of bits.