Question

How to insert an element in a set with Kotlin

Answer 1

fun main() {
    val mutableSet = mutableSetOf("Kotlin", "C", "C++")
    println("Before adding: $mutableSet")

    // Adding an element
    val isAdded = mutableSet.add("Java")
    println("After adding: $mutableSet")
    println("Element added? $isAdded")
}

 
  
/*
run:
 
Before adding: [Kotlin, C, C++]
After adding: [Kotlin, C, C++, Java]
Element added? true

*/

 

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Answer 2

fun main() {
    val mutableSet = mutableSetOf("Kotlin", "C", "C++")
    println("Before adding: $mutableSet")

    // Adding multiple elements
    mutableSet.addAll(listOf("Java", "Python"))
    println("After adding: $mutableSet")
}

 
  
/*
run:
 
Before adding: [Kotlin, C, C++]
After adding: [Kotlin, C, C++, Java, Python]

*/

 

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