firebase - How to search document(s) from a collection based on a Field in Firestore database?

Question

I'm working on a React Native application and I'm fetching profiles from a firebase collection. And I want to add a search functionality where when I enter even the first 1 or 2 (or more) alphabets of a username and press the search button. I should be able to fetch usernames starting with those 1 or 2 alphabets.

I did check Cloud Firestore queries but couldn't find one for my problem.

UPDATED QUESTION:

In the above code, I'm adding the below code as answered by Renaud Tarnec.

 let queries = hashes.map(hash => rangeQueryParams(hash))
            .map(range => profiles.where('hash', '>=', range.start).where('hash', '<', range.end)
            .orderBy('displayName') // displayName is the name of Field here
            .startAt(searchString)
            .endAt(searchString + 'uf8ff')
            .get());

But this doesn't seems to work. I guess it's because range filter and orderBy are on different fields here.

Answer 1

Waitting for answers