trivial bug in eintr

trivial bug in eintr

[Ralph Moritz]

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Hello Emacs,

edition 2.14 of the Emacs Lisp Introduction (eintr) says the
following in section 7.5 (Node: setcar),

  ...
       (setq animals '(antelope giraffe lion tiger))
  ...
       (setcar animals 'hippopotamus)
  ...
       animals
            => (hippopotamus giraffe lion tiger)

  The first element on the list, `antelope' is replaced by `hippopotamus'.

     So we can see that `setcar' did not add a new element to the list as
  `cons' would have; it replaced `giraffe' with `hippopotamus'; it
  _changed_ the list.

I believe that `giraffe' should be changed to `antelope' in the last
paragraph, above.

Regards,
Ralph

-- 
Ralph Moritz
Ph:     +27 72385 0679 (cell)
        +27 31705 5268 (home)

A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on Usenet?

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Re: trivial bug in eintr

[David Kastrup]

"Ralph Moritz" <ralmoritz@gmail.com> writes:

> Hello Emacs,
>
> edition 2.14 of the Emacs Lisp Introduction (eintr) says the
> following in section 7.5 (Node: setcar),
>
>  ...
>       (setq animals '(antelope giraffe lion tiger))
>  ...
>       (setcar animals 'hippopotamus)
>  ...
>       animals
>            => (hippopotamus giraffe lion tiger)
>
>  The first element on the list, `antelope' is replaced by `hippopotamus'.
>
>     So we can see that `setcar' did not add a new element to the list as
>  `cons' would have; it replaced `giraffe' with `hippopotamus'; it
>  _changed_ the list.
>
> I believe that `giraffe' should be changed to `antelope' in the last
> paragraph, above.

Fixed.

-- 
David Kastrup, Kriemhildstr. 15, 44793 Bochum