> (comma-separated (list "1" "2" "3" "4" "5")) ==> "\"1\", \"2\",
\"3\", \"4\", \"5
> It must work with any data type - ints, strings, other lists, etc.
The OP needs different encoding rules per type (some of which are
unspecified, strings must be quoted, "etc."), and this could possibly be
recursive (list of list of whatever* *and so on).
On Wednesday, April 3, 2013 1:33:22 AM UTC+2, Jim foo.bar wrote:
>
> I'm sorry, I've not followed this discussion - what is wrong with
>
> user=>(apply str (interpose \, (list 1 2 3 4 5)))
> "1,2,3,4,5"
>
> the problem is strings where you want to preserve each string...you can
> special case that and avoid the (apply str...) bit..
> user=> (interpose \, (list "jim" "jon" "chris"))
> ("jim" \, "jon" \, "chris")...
>
> once you have that pr-str is your friend...
>
> =>(apply pr-str (interpose \, (list "jim" "jon" "chris")))
> "\"jim\" \\, \"he\" \\, \"dan\""
>
> Is this not exactly what you want and fast enough?
>
> Jim
>
>
> On 02/04/13 23:49, Max Penet wrote:
>
> Using a protocol fn to do the encoding of the values according to the
> rules you set per type then using clj.string/join should be quite fast and
> not so horrible.
>
>
> On Thursday, October 28, 2010 2:18:08 AM UTC+2, andrei wrote:
>>
>> Hi all,
>>
>> I work with a database and need a function, that will convert Clojure
>> sequence to a string with a comma-separated elements. E.g.,
>>
>> (comma-separated (list 1 2 3 4 5)) ==> "1, 2, 3, 4, 5"
>>
>> It must work with any data type - ints, strings, other lists, etc.
>> E.g. for a list of strings it must generate
>>
>> (comma-separated (list "1" "2" "3" "4" "5")) ==> "\"1\", \"2\",
>> \"3\", \"4\", \"5\""
>>
>> I tried `cl-format` function from clojure.contrib.pprint package:
>>
>> (cl-format nil "~{~S~^, ~}" lst)
>>
>> It works fine, but is too slow. Next, I tried such function:
>>
>> (defn comma-separated [s]
>> (if (= (type (first s)) String)
>> (chop (chop (chop (str "\" (apply str (interleave s
>> (repeatedly (fn [] "\", \"")))))))
>> (chop (chop (apply str (interleave s (repeatedly (fn [] ",
>> ")))))))))
>>
>> This one works much faster (~20 times), but it is ugly and still
>> doesn't cover all cases.
>>
>> So, what is the fastest way to generate such list?
>
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