(Short Code) ES6 Method for users

Hey i need someone to make a method on my code, its a short one // 1. I wish I could filter all my users as cleanly as possible, keeping only the key with informations // 2. I would like to make a match between the emails from Table A (API) with Table B (FIREBASE) using the email, provided by both. // 3. I'd like to get a final table, from one or the other, with only the USERS present in the LYYTI list, BUT with the avatars coming from Firebase my code is very light ( around 50 lines ) Code is ready, all examples are made, i want it for tomorrow, just tell me :)