What is a hash in Ruby?

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  1. #indexing
  2. #arbitrary
  3. #salary
  4. #similar
  5. #object
  6. #index
  7. #except
  8. #employee
  9. #value
  10. #integer
  11. #advertisements
  12. #pairs
  13. #hashes
  14. #array
  15. #collection