On 11/24/2019 5:30 PM, Jonathan Simpson wrote:
The documentation for char=? leaves the impression that it takes a
minimum of two arguments:
https://docs.racket-lang.org/reference/characters.html?q=expand#%28def._%28%28quote._~23~25kernel%29._char~3d~3f%29%29
If a single character is passed
Not sure if this is the main reason, but say you are applying char=? to a list
of unknown length to see if all elements are equal. It makes sense that a list
with 1 element is a list with all elements equal.
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First, I strongly recommend the second edition, which is what you get
at htdp.org. In that case, you'll do many things differently with
respect to teachpacks, but the ideas will be very similar.
Second, when you choose "Add Teachpack" from the "Language" menu in
DrRacket, you should see three pane
Thank you, Sam-
I'm apparently reading a pdf version published in 2002 (Copyright 2001
Third Printing). Of course, it still refers to DrScheme and Scheme. Is
there a newer one?
I'm at Exercise 2.2.1, converting Fahrenheit to Celsius. The exercise calls
for installing the teachpack "convert.ss"
Which edition of the book are you using? And can you point to where in
the book you ran into trouble, and what happened? The full book is
online, so a link to the section would be very helpful.
Sam
On Sun, Nov 24, 2019 at 9:28 PM Michael Burke wrote:
>
> I'm sure this has been asked and answered
I'm sure this has been asked and answered, but are their any current
descriptions of how people are adjusting to the book, "How to Design
Programs"? I ran into a problem on the first little exercise that required
me to use a teachpack. Surely someone has a lit of work-around for this?
Thanks,
The documentation for char=? leaves the impression that it takes a minimum
of two arguments:
https://docs.racket-lang.org/reference/characters.html?q=expand#%28def._%28%28quote._~23~25kernel%29._char~3d~3f%29%29
If a single character is passed as argument 1, char=? returns true. To me,
'='
Thanks, Dominik,
that appears to do the trick! (pdfgrep is immediately happy...).
Much appreciated,
Tim
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Hi,
On 24. 11. 19 13:01, Tim Hanson wrote:
> hi,
>
> I need to fetch a number of PDF documents and wrote a bit of racket to make
> it easier. The part that "downloads" is this:
>
> (let ([content
>((compose port->string get-pure-port string->url) (url-for-doc
> year doc-name))
hi,
I need to fetch a number of PDF documents and wrote a bit of racket to make it
easier. The part that "downloads" is this:
(let ([content
((compose port->string get-pure-port string->url) (url-for-doc year
doc-name))])
(let ([out (open-output-file full-path-of-file-to-w
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