Why is map faster than foreach?

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  2. #values
  3. #calls
  4. #defined
  5. #callback
  6. #anything
  7. #provided
  8. #utilizes
  9. #difference
  10. #method
  11. #returns
  12. #actually
  13. #allowed
  14. #mutate
  15. #return
  16. #array
  17. #doesn
  18. #element
  19. #simply
  20. #calling
  21. #foreach
  22. #undefined