On Jul 28, 12:22 pm, Thorsten Wilms <t...@freenet.de> wrote:
> On 07/28/2011 06:34 PM, Tuba Lambanog wrote:
>
> > The determination of whether a called function will apply is left as a
> > responsibility of the function itself, rather than the calling
> > function. The motivation is that a function may be called from a
> > number of places. Perhaps there's a better way?
>
> The called function cannot decide to not be applied, but it may either
> evaluate to its argument (assuming unary), or a value derived from that
> argument.
>
> I guess pattern matching would be nice here, but even without, you could
> perhaps split the conditions from the actions. Is there any reason to
> test additional rules after one matches, or would it be beneficial to
> stop after a match? That would make it similar to URL routing like e.g.
> Moustache does it.
>
> From your description, it did sound like you want to call the 2nd
> function with the original argument, not the result of the 1st function.
> But how would you accumulate all the results, then?
You don't need to "change" the original value at all - you just want
to compute a new value, which, as Thorsten says, may be the same as
the original, or not. Then pass that new value to another function
that may decide to change it again, or not, and then...
(defn fix-ou [word]
(clojure.string/replace word #"ou" "o"))
(defn fix-ize [word]
(clojure.string/replace word #"ise" "ize"))
(defn apply-all-fixes [word]
(fix-ize (fix-ou word)))
(defn fix-whole-sentence [words]
(for [word words]
(apply-all-fixes word)))
user> (fix-whole-sentence ["don't" "criticise" "the" "labour"
"party"])
("don't" "criticize" "the" "labor" "party")
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