Count Implementation

database.rb

class Database
  def initialize
    @count = Hash.new(0)
    @db = Hash.new()
  end

  # CRUD COMMANDS

  def set(key, value)
    @db[key] = value
    @count[value] += 1

    return nil
  end

  def get(key)
    @db.fetch(key, "NULL")
  end

  def count(value)
    @count.fetch(value, 0)
  end
end