Re: [PATCH] Gnu Elpa: stream.el: Add some more basic stream operations

[Nicolas Petton]

Michael Heerdegen <address@hidden> writes:

> BTW, with the suggested approach, you can use a counter to specify a
> break condition, like here, were I want to calculate the stream of
> natural numbers up to a place where two subsequent elements have a
> difference that is not less than 2 (which never happens), but where I
> say I want to have at most 25 elements:
>
> #+begin_src emacs-lisp
> (seq-into-sequence
>  (car
>   (stream-divide
>    (let (the-naturals) (setq the-naturals (stream-cons 1 (seq-map #'1+ 
> the-naturals))))
>    (let ((counter 0))
>      (lambda (this next)
>        (and (< (cl-incf counter) 25)
>             (< (- next this) 2)))))))
> ==> (1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25)
> #+end_src

That's really neat!

Cheers,
Nico

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