removeFirst
Removes the first element from this mutable list and returns that removed element, or throws NoSuchElementException if this list is empty.
@IgnorableReturnValuefun <T> MutableList<T>.removeFirst(): T(source)
fun main() {
val numbers = mutableListOf(1, 2, 3)
val first = numbers.removeFirst()
println("Removed: $first") // 1
println("Remaining list: $numbers") // [2, 3]
}