I found an answer to my question, see below. Suggestions for improvements
are welcome!
(defn showeval [form]
(let [[f & args] form]
(str (clojure.string/trim-newline
(with-out-str
(clojure.pprint/pprint (map #(if (list? %1) `'~%1 %1) form))))
" => "
(or (pr-str (apply (resolve f) args)) "nil"))))
(doseq [op '(first next rest)]
(doseq [cs '((nil)
(() (1 2 3))
([] [1 2 3])
({} {:a 1 :b 2 :c 3})
(#{} #{1 2 3}))]
(doseq [c cs]
(println (showeval `(~op ~c))))))
Prints:
(first nil) => nil
(first '()) => nil
(first '(1 2 3)) => 1
(first []) => nil
(first [1 2 3]) => 1
(first {}) => nil
(first {:a 1, :b 2, :c 3}) => [:a 1]
(first #{}) => nil
(first #{1 3 2}) => 1
(next nil) => nil
(next '()) => nil
(next '(1 2 3)) => (2 3)
(next []) => nil
(next [1 2 3]) => (2 3)
(next {}) => nil
(next {:a 1, :b 2, :c 3}) => ([:b 2] [:c 3])
(next #{}) => nil
(next #{1 3 2}) => (3 2)
(rest nil) => ()
(rest '()) => ()
(rest '(1 2 3)) => (2 3)
(rest []) => ()
(rest [1 2 3]) => (2 3)
(rest {}) => ()
(rest {:a 1, :b 2, :c 3}) => ([:b 2] [:c 3])
(rest #{}) => ()
(rest #{1 3 2}) => (3 2)
Le jeudi 13 novembre 2014 13:35:25 UTC+1, Sébastien Bocq a écrit :
>
> Hi,
>
> I would like to display the results of applying first, next, rest to
> different collections. In the end, I'd like to create an org table with the
> forms and their result.
>
> I began simply with this:
>
> (doseq [op '(first next rest)]
> (doseq [cs '((nil)
> ('() '(1 2 3))
> ([] [1 2 3])
> ({} {:a 1 :b 2 :c 3})
> (#{} #{1 2 3}))]
> (doseq [c cs]
> (println (showeval `(~op ~c))))))
>
> To print:
>
> (first nil) => nil
> (first '()) => nil
> (first '(1 2 3)) => 1
> ...
>
> Question: how would you implement showeval?
>
> Thanks,
> Sébastien
>
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