How to shuffle elements of Mutable list in Kotlin? - kotlin

Question

I wanted to create a MutableList of alphabets and then shuffle them and store it in another MutableList.
I used shuffle() function but it resulted in the original list being shuffled as well which I didn't wanted to happen as I will be using the original list to map it with new shuffled one.
fun main(){
val alphabets = ('A'..'Z').toMutableList()
var shuffAlp = alphabets
shuffAlp.shuffle()
println(alphabets)
println(shuffAlp)
}
So I had to create two mutable list and then shuffle one of them
val alphabets = ('A'..'Z').toMutableList()
var shuffAlp = ('A'..'Z').toMutableList()
shuffAlp.shuffle()
This might be a trivial question but is there any other way where I do not have to create two same list?

Answer 1

shuffle does shuffle into original list, shuffled do and return new list.
And same behavior is for sort & sorted, sortBy & sortedBy, reverse & asReversed:
fun main(){
val alphabets = ('A'..'Z').toMutableList()
val shuffAlp = alphabets.shuffled()
println(alphabets)
println(shuffAlp)
}
Result:
[A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z]
[U, B, A, N, H, R, O, K, X, C, W, E, Q, P, J, Z, L, Y, S, M, I, D, V, F, G, T]