Question

How to insert an element in a set with Scala

Answer 1

import scala.collection.mutable

val mutableSet = mutable.Set(1, 2, 3, 4)
mutableSet += 5          // Adds a single element
mutableSet ++= Set(6, 7) // Adds multiple elements

println(mutableSet)     



/*
run:
 
HashSet(1, 2, 3, 4, 5, 6, 7)
 
*/
 

 

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Answer 2

val immutableSet = Set(1, 2, 3, 4)
val newSet = immutableSet + 5          // Adds a single element
val anotherSet = immutableSet ++ Set(6, 7) // Adds multiple elements

println(newSet)     
println(anotherSet)  



/*
run:
 
HashSet(5, 1, 2, 3, 4)
HashSet(1, 6, 2, 7, 3, 4)
 
*/

 

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