Re: maphash

["Stephen J. Turnbull" <stephen@xemacs.org>]

>>>>> "rms" == Richard Stallman <rms@gnu.org> writes:

    I have discovered by experimentation that maphash actually does what 
    I hoped it would, which is to pass key/value pairs to the mapping 
    function in the same order in which they were added to the table. 

    rms> An small anount of experimentation doesn't show you it will
    rms> always to do that.  It would be necessary to study the code
    rms> and construct a proof, before we could promise this to the
    rms> users.

If I understand the OP's description correctly, I can already promise
you that code depending on such a feature won't be portable to XEmacs:

(let ((my-hash (make-hash-table))
      result)
  (puthash "key1" "val1" my-hash)
  (puthash "key2" "val2" my-hash)
  (puthash "key3" "val3" my-hash)
  (maphash (lambda (k v) (setq result (cons k result))) my-hash)
  (reverse result))

=> ("key2" "key3" "key1")


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