1. class Moi
  2. [1] pry(main)*   def []=(key,value)
  3. [1] pry(main)*     p key, value
  4. [1] pry(main)*   end
  5. [1] pry(main)* end
  6. => :[]=
  7. [2] pry(main)> Moi.new["foo"] = "bar"
  8. "foo"
  9. "bar"
  10. => "bar"
  11. [3] pry(main)>