You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: data.rb
    path of file: ./repos/facets/work/rejected/hash
    
    the code of the file until where you have to start completion: require 'facets/functor'

class Hash

  # TODO: Change name of Hash#data to something bette
    
  def data
    this = self
    Functor.new do |op, *a|
      case op.to_s
      when /\=$/
        op = op.to_s.chomp('=')
        this[op] = a.first
      when /\?$/
        op = op.to_s.chomp('?')
        this.key?(op.to_s) || this.key?(op.to_sym)
      when /\!$/
        op = op.to_s.chomp('!')
        this[op] # ???
      else
        this[op.to_s] || this[op.to_sym]
      end
    end