lists, vecotrs, and hashes all have an empty() method, so
(defn clone-coll
([coll clone-item] (clone-item (seq coll) coll clone-item))
([seq coll clone-item]
(if (not seq)
(.empty coll)
(cons (clone-item (first seq)) (clone-coll (rest seq) coll clone-
item))
)
)
)
will clone your collection and in if you pass your replacement
function, as clone-item, youc can replace the symbol.
On Nov 15, 11:15 pm, Konrad Hinsen <[EMAIL PROTECTED]> wrote:
> I am trying to write a function (for use in a macro) that replaces a
> given keyword in a form by a given symbol, i.e.
>
> (replace-symbol :foo :bar form)
>
> should return the form with all occurences of :foo replaced by :bar.
> This turned out to be surprisingly difficult. I started out like this:
>
> (defn replace-symbol [original replacement form]
> (if (= form original)
> replacement
> (if (islist? form) ...)))
>
> But there is no islist?, nor anything that looks equivalent. So how
> do I test if form is a list? Or a vector? Or a map? For processing
> general forms, I'd need to handle all of these, right? Or is there a
> simpler way to do it?
>
> Konrad.
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