Update docs to give example of associng a bean

[mfikes]

In the Object Extraction doc (https://github.com/mfikes/cljs-bean/blob/master/doc/object.md) it gives an example where associng a string key causes a snapshot.

The doc should be updated to describe that associng a map value also causes a snapshot. The doc can describe how associng a bean can be used as a workaround to avoid snapshotting.

[martinklepsch]

(-> (cljs-bean/->clj #js {:some "data"})
    (assoc ::more (cljs-bean/->clj #js {:data "foo"})))

Here's an example of the workaround. I didn't completely understand what you meant the first time you mentioned it, but now it clicked. Thanks 🙂

[martinklepsch]

I'm also curious, does it make a difference to do something like this? i.e. will it cause a snapshot?

(-> (cljs-bean/->clj #js {:some "data"})
    (assoc-in [::more :data] "foo"))

[mfikes]

@martinklepsch Yes, that would cause a snapshot as well because it is like

(let [m (cljs-bean/->clj #js {:some "data"})]
   (assoc m ::more (assoc-in (get m ::more) [:data] "foo")))

and that inner assoc-in operates on nil, producing a persistent map.