Hello guys, Can any one please answer the followi...

# getting-started

[am]

Hello guys,
Can any one please answer the following question
https://discuss.kotlinlang.org/t/how-does-tolist-function-works/6905
🙏

[miszmaniac]

public fun <T> Iterable<T>.toList(): List<T> {
    if (this is Collection) {
        return when (size) {
            0 -> emptyList()
            1 -> listOf(if (this is List) get(0) else iterator().next())
            else -> this.toMutableList()
        }
    }
    return this.toMutableList().optimizeReadOnlyList()
}

This way:)

[miszmaniac]

it’s extension on collection

[Andreas Sinz]

@am we are not talking about mutable vs immutable lists. there are no real ìmmutable-lists in kotlin yet. List is a read-only view of a MutableList underneath

[am]

Hey @Andreas Sinz can you more simplify please

[Andreas Sinz]

immutable means that an object cannot change at all. As you've found out, toList() creates a mutableList and returns an object that implements List<T> which has no methods on it to change the underlying mutableList, so its a read-only List

[Andreas Sinz]

toList only guarantees that you get an object back that implements List<T>, using mutableList() is just an implementation detail

[am]

Ooh thanks it clears a little air, this will help me in future Thank You @Andreas Sinz