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* bug#25129: 26.0.50; seq-some function
@ 2016-12-07  8:09 Pierre Lorenzon
  2016-12-07  8:48 ` Nicolas Petton
  0 siblings, 1 reply; 9+ messages in thread
From: Pierre Lorenzon @ 2016-12-07  8:09 UTC (permalink / raw)
  To: 25129



Is documentation in following seq-somme function not ambiguous
? One might believe taht it returns the element and not the
test result as it does. Moreover I suspect even if I did not
verify that it was not so in a previous implementation since I
had no error in my code before using seq-some.


I well understand now that I must use seq-find instead of
seq-some but I think that I will not be the only one being
confused by these functions specifications !

In fact there is a very subtle difference between two
documentation : value not equal element .... But what means
value ? Is it obvious taht it means test result ?


Regards

Pierre
>>>  -- Code 

(cl-defgeneric seq-some (pred sequence)
  "Return the first value for which if (PRED element) is non-nil for in SEQUENCE."
  (catch 'seq--break
    (seq-doseq (elt sequence)
      (let ((result (funcall pred elt)))
        (when result
          (throw 'seq--break result))))
    nil))

(cl-defgeneric seq-find (pred sequence &optional default)
  "Return the first element for which (PRED element) is non-nil in SEQUENCE.
If no element is found, return DEFAULT.

Note that `seq-find' has an ambiguity if the found element is
identical to DEFAULT, as it cannot be known if an element was
found or not."
  (catch 'seq--break
    (seq-doseq (elt sequence)
      (when (funcall pred elt)
        (throw 'seq--break elt)))
    default))

>>>  -- End Code 









In GNU Emacs 26.0.50.1 (x86_64-unknown-linux-gnu)
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^ permalink raw reply	[flat|nested] 9+ messages in thread

end of thread, other threads:[~2016-12-07 16:57 UTC | newest]

Thread overview: 9+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2016-12-07  8:09 bug#25129: 26.0.50; seq-some function Pierre Lorenzon
2016-12-07  8:48 ` Nicolas Petton
2016-12-07 10:19   ` Tino Calancha
2016-12-07 10:24     ` Nicolas Petton
2016-12-07 10:31       ` Tino Calancha
2016-12-07 12:31         ` Nicolas Petton
2016-12-07 16:16         ` Eli Zaretskii
2016-12-07 16:57         ` Pierre Lorenzon
2016-12-07 16:28   ` Pierre Lorenzon

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