Firestore add to field array

DocumentReference washingtonRef = db.collection("cities").document("DC");

// Atomically add a new region to the "regions" array field.
washingtonRef.update("regions", FieldValue.arrayUnion("greater_virginia"));

// Atomically remove a region from the "regions" array field.
washingtonRef.update("regions", FieldValue.arrayRemove("east_coast"));

Similar codes

0 vote213 views2 answers
Print character in string java
Java
1 vote217 views3 answers
Sdkman
Java
0 vote215 views1 answer
Android studio fecth audio from app directory
Java
1 vote214 views1 answer
Reload zsh profile
Java
6 votes224 views9 answers
E
Java
22 votes238 views1 answer
Swing disable button
Java
0 vote275 views1 answer
Spigot hide player
Java
0 vote226 views1 answer
Spring boot interview questions 2020
Java
0 vote217 views1 answer
Remove whitespaces
Java
9 votes222 views2 answers
I have AdoptOpenJDK 8 but java --version gettinbg Unrecognized option: --version Error: Could not create the Java Virtual Machine. Error: A fatal exception has occurred. Program will exit.
Java