On Oct 22, 5:55 pm, Christophe Grand wrote:
> (def hexchar? (set "0123456789ABCDEFabcdef"))
That's really nice!
Here is my perverse entry for fun:
(def hexchar? (set (map char (mapcat range [48 65 97] [58 71 103]
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On Wed, Oct 21, 2009 at 5:50 PM, Lauri Pesonen wrote:
>
> 2009/10/21 John Harrop :
>
> > Like this?
> > (def hexchar? #{\0 \1 \2 \3 \4 \5 \6 \7 \8 \9 \A \a \B \b \C \c \D \d \E
> \e
> > \F \f})
>
> Yep, that's what I had in mind as well, but I got tired of typing ;-)
>
(def hexchar? (set "01234
Thanks, all, that's enlightening. So if I understand correctly, I
designed hexchar? to accept a string argument, which means it needed a
CharSequence, right? But instead it was getting a Char, which is not
the same thing as a one-character string, and thus was not a
CharSequence.
Yahrgh, I've bee
2009/10/21 John Harrop :
> Like this?
> (def hexchar? #{\0 \1 \2 \3 \4 \5 \6 \7 \8 \9 \A \a \B \b \C \c \D \d \E \e
> \F \f})
Yep, that's what I had in mind as well, but I got tired of typing ;-)
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! Lauri
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On Wed, Oct 21, 2009 at 10:51 AM, Lauri Pesonen wrote:
> One way to fix this would be to produce a string out of c:
>
> (defn hexchar? [c] (re-find #"[0-9A-Fa-f]" (str c)))
>
> but you should really change hexchar? into something more elegant.
Like this?
(def hexchar? #{\0 \1 \2 \3 \4 \5 \6 \7
Hi Mark,
2009/10/21 Mark Nutter :
>
> (defn blank? [s] (every? #(Character/isWhitespace %) s))
> user=> (defn hexchar? [c] (re-find #"[0-9A-Fa-f]" c))
> user=> (defn hex? [s] (every? #(hexchar? %) s))
> #'user/hex?
> nil
> user=> (hex? "a")
> # cannot be cast to java.lang.CharSequence (NO_S
The problem is that hexchar? expects a CharSequence, but by using
every? you're actually passing a Character into it. The quick fix is
to change hex? to (defn hex? [s] (every? #(hexchar? (str %)) s)).
However, the better solution is probably to change hexchar? to accept
Characters instead -- a la
Hi all, newcomer to clojure/lisp/fp here. I'm working my way through
the Programming Clojure book (very excellent, well worth the money),
and doing some dabbling in the REPL, and I'm seeing something that
puzzles me. In the book there's an example of a clojure blank?
function that looks like this:
