- Scala Collections Tutorial
- Scala Collections - Home
- Scala Collections - Overview
- Scala Collections - Environment Setup
- Scala Collections - Arrays
- Scala Collections - Array
- Scala Collections - Multi-Dimensional Array
- Scala Collections - Array using Range
- Scala Collections - ArrayBuffer
- Scala Collections - Lists
- Scala Collections - List
- Scala Collections - ListBuffer
- Scala Collections - ListSet
- Scala Collections - Vector
- Scala Collections - Sets
- Scala Collections - Set
- Scala Collections - BitSet
- Scala Collections - HashSet
- Scala Collections - TreeSet
- Scala Collections - Maps
- Scala Collections - Map
- Scala Collections - HashMap
- Scala Collections - ListMap
- Scala Collections - Miscellaneous
- Scala Collections - Iterator
- Scala Collections - Option
- Scala Collections - Queue
- Scala Collections - Tuple
- Scala Collections - Seq
- Scala Collections - Stack
- Scala Collections - Stream
- Scala Collections Combinator methods
- Scala Collections - drop
- Scala Collections - dropWhile
- Scala Collections - filter
- Scala Collections - find
- Scala Collections - flatMap
- Scala Collections - flatten
- Scala Collections - fold
- Scala Collections - foldLeft
- Scala Collections - foldRight
- Scala Collections - map
- Scala Collections - partition
- Scala Collections - reduce
- Scala Collections - scan
- Scala Collections - zip
- Scala Collections Useful Resources
- Scala Collections - Quick Guide
- Scala Collections - Useful Resources
- Scala Collections - Discussion
Scala Collections - ListSet
Scala Set is a collection of pairwise different elements of the same type. In other words, a Set is a collection that contains no duplicate elements. ListSet implements immutable sets and uses list structure. Elements insertion order is preserved while storing the elements.
Declaring ListSet Variables
The following is the syntax for declaring an ListSet variable.
Syntax
var z : ListSet[String] = ListSet("Zara","Nuha","Ayan")
Here, z is declared as an list-set of Strings which has three members. Values can be added by using commands like the following −
Command
var myList1: ListSet[String] = myList + "Naira";
Processing ListSet
Below is an example program of showing how to create, initialize and process ListSet −
Example
import scala.collection.immutable.ListSet
object Demo {
def main(args: Array[String]) = {
var myList: ListSet[String] = ListSet("Zara","Nuha","Ayan");
// Add an element
var myList1: ListSet[String] = myList + "Naira";
// Remove an element
var myList2: ListSet[String] = myList - "Nuha";
// Create empty set
var myList3: ListSet[String] = ListSet.empty[String];
println(myList);
println(myList1);
println(myList2);
println(myList3);
}
}
Save the above program in Demo.scala. The following commands are used to compile and execute this program.
Command
\>scalac Demo.scala \>scala Demo
Output
ListSet(Zara, Nuha, Ayan) ListSet(Zara, Nuha, Ayan, Naira) ListSet(Zara, Ayan) ListSet()
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