Phil Hagelberg <p...@hagelb.org> writes:
> It's a pretty common idiom in other languages for substring functions
> to count from the end if given a negative index.
>
> (substring "hello world!" 6 -1) ;; => "world"
>
> I'd be glad if Clojure's "subs" function could work like this. Should
> I create an issue and patch to implement it?
Haven't heard any response on this positive or negative.
Here's the new function definition:
(defn subs
"Returns the substring of s beginning at start inclusive, and ending
at end (defaults to length of string), exclusive. Negative arguments
count from the end."
([#^String s start] (subs s start (count s)))
([#^String s start end]
(let [count-back #(if (< 0 %) (+ (count s) %) %)]
(.substring s (count-back start) (count-back end)))))
Am I the only one who finds this useful? Perhaps if it's not suited for
core it could go in str-utils in contrib as "substring".
Thoughts?
-Phil
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