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missionary
2024-12-19T16:12:14.329069Z
Hi, so I’ve been playing around with missionary and it’s really an amazing library.
I’m trying to only run (m/reduce) when a value changes. I.e is not equal to it’s previous value. Is there a way to do this?
Here’s a rough outline of my code:
(def main
(let [m/reduce if the <result signal value is not equal to the previous <result signal value. Hope that makes sense! Thanks.
leonoel 2024-12-19T16:18:07.231239Z
cp and latest have this optimization baked in - e.g. (m/latest prn <result) will not print duplicates
leonoel 2024-12-19T16:18:44.056669Z
you still need m/reduce to sample, but it can be a no-op
2024-12-19T16:23:43.214299Z
(def main
(let [<result (m/signal (m/latest some-query <db))
<x (m/latest prn <result)]
(m/reduce {} nil <x)))leonoel 2024-12-19T16:24:02.498619Z
it should
2024-12-19T16:25:43.680419Z
This is so much better than async/event buses. Blown away with how simple it has been to get the actual behaviour I want (once you get over the initial learning curve). Makes writing push based system so much nicer. Thank you!
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