BitSet in Scala - GeeksforGeeks

04 Jul, 2019
A set is a collection which only contains unique items which are not repeatable. A BitSet is a collection of small integers as the bits of a larger integer. Non negative integers sets which represented as array of variable-size of bits packed into 64-bit words is called BitSets. The largest number stored in bitset is the memory of a bitset. It extends Set trait.
Syntax:
var BS : BitSet = BitSet(element1, element2, element3, ....)  

Where BS is the name of created BitSet
In Scala, BitSet have two versions: scala.collection.immutable.BitSet and scala.collection.mutable.BitSet. They are almost identical but the mutable version changes the bits in place so immutable data structures are much better for concurrency.
Initialize a BitSet : Below is the example to create or initialize BitSet.
Example :
// Scala program to initialize a BitSetimport scala.collection.immutable.BitSet  // Creating objectobject GFG{     // Main method    def main(args:Array[String])    {         println("Initialize a BitSet")                  // Creating HashSet        val bitSet: BitSet = BitSet(0, 1, 2, 3)        println(s"Elements are = $bitSet")    }} 
Initialize a BitSet
Elements are = BitSet(0, 1, 2, 3)

 Check specific elements in BitSet :
Example :
// Scala program of Check specific elements in BitSetimport scala.collection.immutable.BitSet  // Creating objectobject GFG{     // Main method    def main(args:Array[String])    {         println("Initialize a BitSet")                  // Creating BitSet        val bitSet: BitSet = BitSet(0, 1, 2, 3)        println(s"Elements are = $bitSet")                  // Checking        println(s"Element 2 = ${bitSet(2)}")        println(s"Element 4 = ${bitSet(4)}")    }} 
Initialize a BitSet
Elements are = BitSet(0, 1, 2, 3)
Element 2 = true
Element 4 = false

 Adding an elements in BitSet : We can add an element in BitSet by using + sign. below is the example of adding an element in BitSet.
Example :
// Scala program of adding an element in BitSetimport scala.collection.immutable.BitSet  // Creating objectobject GFG{     // Main method    def main(args:Array[String])    {         println("Initialize a BitSet")                  // Creating BitSet        val bs: BitSet = BitSet(0, 1, 2, 3)        println(s"Elements are = $bs")                  // Adding an element in BitSet        val bs1: BitSet = bs + 10 + 11        println(s"Adding elements to BitSet = $bs1")    }}
Initialize a BitSet
Elements are = BitSet(0, 1, 2, 3)
Adding elements to BitSet = BitSet(0, 1, 2, 3, 10, 11)

 Adding more than one element in BitSet : We can add more than one element in BitSet by using ++ sign. below is the example of adding more than one elements in BitSet.
Example :
// Scala program of adding more elements in BitSetimport scala.collection.immutable.BitSet  // Creating objectobject GFG{     // Main method    def main(args:Array[String])    {         println("Initialize a BitSet")                  // Creating BitSet        val bs: BitSet = BitSet(0, 1, 2, 3)        println(s"Elements are = $bs")                  // Adding elements in BitSet        val bs1: BitSet = bs ++ BitSet(4, 5, 6)        println(s"Add more than one elements to BitSet = $bs1")    }}
Initialize a BitSet
Elements are = BitSet(0, 1, 2, 3)
Add more than one elements to BitSet  = BitSet(0, 1, 2, 3, 4, 5, 6)

 Remove element in BitSet : We can remove an element in BitSet by using – sign. below is the example of removing an element in BitSet.
Example :
// Scala program of removing element in BitSetimport scala.collection.immutable.BitSet  // Creating objectobject GFG{     // Main method    def main(args:Array[String])    {         println("Initialize a BitSet")                  // Creating BitSet        val bs: BitSet = BitSet(0, 1, 2, 3)        println(s"Elements are = $bs")                  // removing elements in BitSet        val bs1: BitSet = bs - 2        println(s"remove element from bitset = $bs1")    }}
Initialize a BitSet
Elements are = BitSet(0, 1, 2, 3)
remove element from bitset = BitSet(0, 1, 3)

 Find the intersection between two BitSets : We can find intersection between two BitSets by using & sign. below is the example of finding intersection between two BitSets.
Example :
// Scala program of finding the intersection between two BitSetsimport scala.collection.immutable.BitSet  // Creating objectobject GFG{     // Main method    def main(args:Array[String])    {         println("Initialize two BitSets")                  // Creating two BitSet        val bs: BitSet = BitSet(0, 1, 2, 3)        println(s"Elements of bitset1 are = $bs")                  val bs1: BitSet = BitSet(4, 5, 3, 6)        println(s"Elements of bitset2 are = $bs1")                  // finding the intersection between two BitSets        println(s"Intersection of bitSet1 and bitSet2 = ${bs & bs1}")    }}
Initialize two BitSets
Elements of bitset1 are = BitSet(0, 1, 2, 3)
Elements of bitset2 are = BitSet(3, 4, 5, 6)
Intersection of bitSet1 and bitSet2 = BitSet(3)

 Initializing an empty BitSet :
Example :
// Scala program of Initializing an empty BitSetimport scala.collection.immutable.BitSet  // Creating objectobject GFG{     // Main method    def main(args:Array[String])    {         // Initializing an empty BitSet        val emptyBitSet: BitSet = BitSet.empty        println(s"Empty BitSet = $emptyBitSet")    }}
Empty BitSet = BitSet()

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