I have a mutablelist of items. One of the items properties is a date value. They are currently sorte...

# announcements

[Cdev]

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?

[KD]

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

[KD]

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

[Cdev]

Thanks I'll take a look that!

[Nir]

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

[Nir]

probably want a combination of windowed and fold I think

[Cdev]

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

[Casey Brooks]

zipWithNext might also work

[Nir]

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