I have List<List> and I want to create List where I have all cars from List<List>. There is any way in Kotlin to create that (using map or something)? I don’t want to create new list and add items in loops

>Solution :

tl;dr List.flatten()

Let’s say your List<List<Car>> is called carLists, then you can simply call val cars: List<Car> = carLists.flatten() if you want to have a single list containing all the cars from the list of lists of cars.

Code only:

val carLists: List<List<Car>> = … // created or received
val cars = carLists.flatten()