My paint function is basically
(defn paint [ctx requests]
(let [response (chan)]
(put! requests [:a :custom :request response])
(go
(let [r (<! response)]
:now-paint-the-pixels))))
My inner loop is inside a go block simply because that's where the code landed.
It wasn't essential that it be inside a go block. But it wasn't wrong, either.
It's just where the code made sense, because my paint function happens to
consume a channel.
In case you're wondering, this canvas is a pixel-analyzing component. It's
layered in front of another canvas and examines its pixels on mousemove. That's
why my paint function consumes a channel -- it requests ImageData from the
other component via a channel-based API.
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