a while?

example.rb

I need 100 usernames some may fail the test

def get_usernames
  response = []
  #loop
    name = random_name()
    response << random_name unless User.find(username: name)
  #end loop
  response
end

def get_usernames
  response = []
  begin
    name = random_name()
    response << random_name unless User.find(username: name)
  end while response.length < 100
  response
end

def get_usernames(desired_names=100)
  names = (10*desired_names).times{ random_name }
  existing = User.all.pluck(:username)
  names = names - existing
  names_still_needed = desired_names - names.length
  if  names < desired_names
    names += get_usernames(names_still_needed)
  else
    names
  end
end