OK, now I understand (String/format "'%-9s'" (to-array "12345")) and
(String/format
"'%-9s'" (to-array '(\1 \2 \3 \4 \5))) both return '1 ' - because in each
case the array returned from to-array contains individual characters and
only the first gets formatted using the format string - but that doesn't
explain why I'm not getting the full 9-character padding of '1 '.
It is also somewhat counter-intuitive as you expect clojure.core/format
when using with a single string argument to format that single string, but
in fact it treats the string as a collection of characters and so only
applies the formatting to the first character. Hence the reason (String/format
"'%-9s'" (to-array ["12345"])) works correctly.
Confusing?
On Sunday, 6 April 2014 13:27:09 UTC-6, Paul Umbers wrote:
>
> I'm trying to right-pad a string up to 9 characters, for example "12345"
> should become "12345 ", and the only idea I've come up with so far is to
> use clojure.core/format which states: "Formats a string using
> java.lang.String.format, see java.util.Formatter for format string syntax
> ". However, there seems to be a discrepancy in what the Clojure format
> function returns compared with the Java formatter.
>
> In Java, new Formatter().format("'%-9s'", "12345") correctly returns '12345
> ' - the ' are there for legibility. String.format("'%-9s'", "12345")also
> returns the correctly padded string.
>
> However, in Clojure (format "'%-9s'" "12345") returns '12345 ' - it has
> only padded the string by 1 space, and not 4 as with the Java version.
>
> Also, (String/format "'%-9s'" (to-array "12345")) - taken from the
> clojure.core/format source and substituting parameters directly- returns '1
> ', and (String/format "'%-9s'" (to-array '(\1 \2 \3 \4 \5)))returns '1
> '.
>
> The one thing that works correctly is (String/format "'%-9s'" (to-array
> ["12345"])) which returns '12345 '.
>
> I'm not really clear on what's going wrong here, but clojure.core/format
> doesn't appear to be working as described - at least for a single string
> argument.
>
> I'll continue to investigate, but if anyone can offer some comments to
> help? ...
>
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