morning

mornings

@jonpither emacs every day

couldn't get by w/o org-mode

does anyone know a neat way to apply <, >, min, max to things that aren’t numbers, but could maybe be java Comparable?

sort-by takes < (for example)

i've done a reduce with a comparator fn in such circumstances @peterwestmacott - no neat trick though

So that's one option, it depends on what you want to do.

oh, you use compare apparently 🙂

I wanted to say eg. (< offset-date-time-1 offset-date-time-2)

yeah compare is a good default comparator

(sort > [4 5 6]) there's definitely something going on with this. I think clojure functions implement the Comparator interface.

yes i think they do @dominicm - you can use any old 2-arg clojure-fn iirc

there’s min-key which is quite nice

Interesting: sort actually creates a java array and uses it's sort method.

min-key/max-key are good for this sort of thing, yeah.

Is there any reason not to use the function from the date system you're using?

eg: (sort (OffsetDateTime/timeLineOrder) [(OffsetDateTime/now) (.minusSeconds (OffsetDateTime/now) 15)]) ?

apart from it being long and ugly, I’m mostly checking if dates are before/after each other, rather than needing to sort a lot of them so it would likely be more performant to call .isBefore

^^ that's what I meant, .isBefore

I just wondered if there was a more general solution (either for all things, or more likely things that are already Comparable), but it sounds like I should just compose core lib fns or get specific

I think core has avoided have multimethods/interfaces for these things for performance reasons. But don't quote me on that.

Morning all.

I'm starting to get hungry, I have a horrible craving for bacon mayo.

all I have is cinnamon bagels.

moin moin, we got back home late last night... our flight on Monday got cancelled 😡

Boo.

@dominicm that sounds likely re: performance

really ? protocols boil down to java interfaces don't they and are fast - is it not just hysterical raisins ?

(where just ~ ∞)

‘just’ is my favourite dangerous word