There's a ticket requesting that enhancement:
http://dev.clojure.org/jira/browse/CLJ-863
Andy
On Feb 15, 2013, at 1:15 PM, Denis Washington wrote:
> Hi,
>
> I just solved the "Replicate a Sequence" problem on 4clojure [1] using
> "interleave". However, I noticed that "interleave" cannot be called with
> a single argument. My first attempt at solving the problem was like
> this:
>
> (defn replicate-n-times [xs n]
> (apply interleave (replicate n xs)))
>
> This works fine for n > 1:
>
> clojure=> (replicate-n-times [1 2 3] 3)
> (1 1 1 2 2 2 3 3 3)
>
> However, for n = 1 the function fails with an exception:
>
> clojure=> (replicate-n-times [1 2 3] 1)
> ArityException Wrong number of args (1) passed to: core$interleave
> clojure.lang.AFn.throwArity (AFn.java:437)
>
> I had to add a special case to make this work:
>
> (fn replicate-n-times [xs n]
> (if (= n 1) xs (apply interleave (replicate n xs))))
>
> I think it would be nice if "interleave" called with a single argument
> would just return the argument itself, just like single-argument "+" and
> "*" do.
>
> Regards,
> Denis Washington
>
> [1] http://www.4clojure.com/problem/33
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