about 1. if that's meant to be portable, yes, not the best indeed, but if 
you look at c.c.string/* or even c.c/str, most of the functions use 
stringbuilder I think.
about 2. probably slower than subs, these are just alternatives to what you 
suggested

On Wednesday, April 2, 2014 1:06:40 PM UTC+2, Andy Smith wrote:
>
> the first isnt pure clojure wo I would probably try to avoid this... e.g. 
> what if I want to port to clojureCLR?
>
> The second 'looks' quite a roundabout way of simply manipulating a string?
>
> How would the following compare for performance?
>
> (defn replace-substring [s r start len] (str (subs s 0 start) r (subs s (+ 
> len start))))
>
> If there is nothing better then I wonder why there isn't something like 
> this in the clojure standard libraries (must be a good reason I suppose)? 
> Its a fairly standard function for a string library isnt it?
>
> Andy
>
>

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