what’s a kotliny way of using

find

to find the one and only item in a list where I know there is no repetition with, according to its ID?

single

?

ahh

That returns the item that matches and throws an exception if there is 0 or more than one that match

everytime i think i got it, i miss another thing 😛

There is also

singleOrNull

if you want

null

in case no item matches

to ensure an item exists, i would use this then

if (leaseCars.singleOrNull { it.id == listingId } != null)

that would check that a singular item with that ID exists, yes.