Candidate mirror function to `fun <T> Iterab...

# stdlib

[Rob Elliot]

Candidate mirror function to fun <T> Iterable<T>.withIndex(): Iterable<IndexedValue<T>> to include in the stdlib:
fun <T> Iterable<IndexedValue<T>>.withoutIndex(): List<T> = map(IndexedValue<T>::value)

[ephemient]

withIndex provides a indexed view, not a copy, while map copies eagerly

[Rob Elliot]

I'm sure there's a better implementation, it's the concept I'm suggesting. Perhaps I should just have gone with the signature:
fun <T> Iterable<IndexedValue<T>>.withoutIndex(): Iterable<T>

[Dominaezzz]

Feels a bit specific. Like what if the indexes are wrong.

[Rob Elliot]

What if they are? It's just to discard them. Iteration order would be unchanged.

[marcinmoskala]

fun <T> Iterable<IndexedValue<T>>.withoutIndex(): Iterable<T> = UnindexedIterable(this)

internal class UnindexedIterable<T>(private val iterable: Iterable<IndexedValue<T>>) : Iterable<T> {
    override fun iterator(): Iterator<T> = UnindexedIterator(iterable.iterator())
}

internal class UnindexedIterator<out T>(private val iterator: Iterator<IndexedValue<T>>) : Iterator<T> {
    override fun hasNext(): Boolean = iterator.hasNext()
    override fun next(): T = iterator.next().value
}