Mutable and immutable set

Collections.kt

// immutable set and mutable set
val colors = setOf("red", "blue", "yellow", "white")
var miniColors = listOf("red", "blue")
var result = colors.containsAll(miniColors)
println(result)

val mutableColors = mutableSetOf("red", "blue", "yellow")
mutableColors.add("pink")
var mutableSetIteratorColors =  mutableColors.iterator()
while (mutableSetIteratorColors.hasNext()) {
    print(mutableSetIteratorColors.next())
}