How to create a Mutable List of Alphabets in Kotlin? - kotlin

Question

I want to create a MutableList of alphabets form A to Z but so far I can only think of the following method as the shortest one without writing each and every alphabet.
fun main()
{
var alphabets: MutableList<Char> = mutableListOf()
for (a in 'A'..'Z')
{
alphabets.add(a)
}
print(alphabets)
}
So I wanted to know if there is any Lambda implementation or shorter method for the same?

Answer 1

You can use CharRange() or using .. operator to create a range.
For example:
val alphabets = ('A'..'Z').toMutableList()
print(alphabets)
// [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]
or
val alphabets = CharRange('A','Z').toMutableList()
print(alphabets)
// [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]

Answer 2

Alternatively, you can use ('a'..'z').joinToString("").
val abc = ('a'..'z').joinToString("")
println(abc) //abcdefghijklmnopqrstuvwxyz
You can perform the same functions on a string in Kotlin as you can perform on a list of characters
For example:
for (i in abc) { println(i) }
This lists each alphabet individually on a new line just as it would if you converted it into a list.

Answer 3

You can use rangeTo extension function as below
private val alphabets = ('A').rangeTo('Z').toMutableList()
println(alphabets)
[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]