addMember method

Group addMember(
  1. String userId
)

//////////// //////////// Adds a member to the group

Implementation

// II.E - Membership Methods
///////////////
/// Adds a member to the group
Group addMember(String userId) {
  if (members.contains(userId)) return this;

  final newMembers = List<String>.from(members);
  newMembers.add(userId);

  return copyWith(members: newMembers);
}