Not sure if I'm missing something here but I have ...

# getting-started

[Colton Idle]

Not sure if I'm missing something here but I have
data class Person(val phoneNumbers: List<String>, val metaData: String) and then a list of people ( ie val people: List<Person>) and I wanna map it into a single list of phone numbers. That's easy right?

people.flatMap{ it.phoneNumbers } cool. that makes sense. but now I actually want to flat map it into a list of phone numbers, and with each phone number I want to attach a piece of metaData so the final type is List<PairString, String.

Any ideas?

[Riccardo Lippolis]

something like: people.flatMap { person -> person.phoneNumbers.map { it to person.metaData } } ?

[Riccardo Lippolis]

or person.metaData to it , depending on which side of the Pair the phonenumber should be

[Colton Idle]

Phone number should be on the left, and meta data on the right. Hm. Could it be as simple as a map inside of the flatmap!? let me try 🙏

[Colton Idle]

yeah, i think that just about does it. thank you so much @Riccardo Lippolis i wouldn't have thought of that. i was just looking for a different operator in general. lol

[Javier]

Do you have repeated phones? If not, probably you should go with a Map and use any group API

[Colton Idle]

id have to check actually, but thanks for the idea Javier