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Use cached value in derived atom watcher #3

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Use cached value in derived atom watcher #3

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10 changes: 6 additions & 4 deletions src/okulary/core.cljs
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Original file line number Diff line number Diff line change
Expand Up @@ -100,11 +100,13 @@
;; As first step we apply the selector to
;; the new source value.
new-value (selector-fn new-source-value)
old-value (selector-fn old-source-value)]
old-value
(if (and (identical? srccache old-source-value)
(not (identical? cache EMPTY)))
cache
(selector-fn old-source-value))]

;; Store the new source value in the instance;
;; this is mainly used by the deref, so this is
;; just a small performance improvement for it.
;; Store the new source value in the instance cache
(set! srccache new-source-value)

;; Cache the new value in the instance.
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