Thanks. I hadn't thought of (apply > ...) - nice! On Sunday, August 20, 2017 at 5:55:01 PM UTC-7, Ghadi Shayban wrote: > > You have the right idea with s/and. I would name & defn the predicate to > something meaningful like increasing?. Defining and thus naming it is > essential so that you can get reuse, and also so that consumers of your > spec, whether it's you or someone else, don't have to interpret the code in > the brain. Btw, the impl can be simplified, but I still wouldn't inline it. > > (defn increasing? [coll] > (apply < coll)) > #'user/increasing? > user=> (increasing? [1 2 3]) > true > user=> (increasing? [1 2 2]) > false > (s/and (s/coll-of number?) increasing?) > > > On Sunday, August 20, 2017 at 7:53:48 PM UTC-4, Mark wrote: >> >> What's the 'right' way to spec relationship between values in a sequence? >> For example, the following spec defines a sequence of number in increasing >> order: >>> >>> >>> >>> (s/conform (s/and (s/coll-of number?) >>> #(->> % >>> (partition 2 1) >>> (map (fn [[a b]] (< a b))) >>> (every? true?))) >>> [1 2 3]) >>> >>> It feels like there ought to be a more elegant solution - especially as >> the relationships become more complex. Is there another approach? >> >
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