Hi,
On Sun, Feb 28, 2010 at 06:29:13AM -0800, Jarkko Oranen wrote:
> 3) The reduce needs an empty map as an init value. Otherwise you get
> an exception (You might even want to populate it with empty vectors,
> but it's not necessary since conjing to nil produces a list)
Quiz time: What is the difference between the following?
(reduce #(update-in %1 [:a] conj %2) {} [1 2 3])
(reduce #(update-in %1 [:a] conj %2) {:a []} [1 2 3])
The difference might or might not be of importance.
Sincerely
Meikel
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