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I have a mutablelist of items. One of the items properties is a date value. They are currently sorted by said date value. I want to insert separator items in-between the items that have different days. What's an idiomatic way to iterate through the mutablelist list and compare the current item and the next item to see if I should insert a separator?

I believe a `mapindexed` would suffice <https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/map-indexed.html>

However you’d have to deal with the edge-case of last index access yourself.

mapIndexed will not quite do it, I don't think, because the result list can have more items than the original one

probably want a combination of `windowed` and `fold` I think

Gotcha, thanks I'll take a look at windowed and fold (I haven't heard of windowed before).

yeah good call zipWithNext is basically windowed for n=2 but nicer