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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