is there a simpler way to write something like: ```val urlIds = ArrayList<Long?> for (u in u...

# getting-started

[Doug]

is there a simpler way to write something like:

val urlIds = ArrayList<Long?>

for (u in urls) {
  urlIds.add(u.id)
}

[Patrick Louis]

I'd suggest

val urlIds = urls.map { it.id }

[Doug]

@Patrick Louis thank you so much!

[Tobias Berger]

If you want to avoid the nullable Long type in the result, you could also use mapNotNull, which will automatically discard the null values and make the generic parameter in your response non-null