Kotlin Questions

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Combine queries in Firestore

Currently i am working on a running tracker app for android phones. for this i will make a follower part also and a news feed. my question
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Kotlin: Nested array indexOf()

Kotlin newbie here -- is there a "neater" way to do this? (my int values are guaranteed unique across the entire set) fun
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Extending Rx Singles zip infinitely

I need to make a lot of api calls asynchronously and obviously make sure that they all pass so i can handle error/success in a single place.
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How to get LiveData from Room?

I'm trying to get livedata from room. so my recycleview can have live updates if anything in database is changed i have tried with out

what is ViewModelFactory

What is viewmodelfactory and when and why should i use it i am new to android and actually i can't understand these concepts in mvvm
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