On Tuesday, November 20, 2012 10:29:18 AM UTC-8, Andy Fingerhut wrote: > > > On Nov 20, 2012, at 10:12 AM, Mark Engelberg wrote: > > > Clojure's sorted collections must be provided with a sorting function > where items "tie" if and only if they are equal. > > > > (sorted-set-by #(compare [(second %) %] [(second %2) %2]) [:a 1] [:b 1] > [:c 1])) > > Mark, I like the brevity of this way of writing comparison functions with > tie breakers, and see that it would extend well to multiple sort keys, and > ascending or descending order on each key can be chosen independently. > > My question is perhaps of the > is-the-number-of-angels-that-can-dance-on-the-head-of-a-pin-finite-or-infinite > > kind. > > Does Clojure promise anywhere in its documentation that it compares > vectors and sequences in lexicographic order? > > I hope not, because that's not what it does! Sequences don't implement Comparable at all, so unless you supply a comparator they can't be sorted. And vectors are compared first by length; only if they have the same length are their elements considered for a lexicographical comparison.
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