ClojureScript - convert arbitrary JavaScript object to Clojure Script map

Question

I am trying to convert a Javascript object to a Clojure. However, I get the following error :

 (js/console.log (js->clj e)) ;; has no effect
 (pprint (js->         


        

Answer 1

Two approaches that do not require writing custom conversion functions - they both employ standard JavaScript functions to loose the custom prototype and thus enable clj->js to work correctly.

Using JSON serialization

This approach just serializes to JSON and immediately parses it:

(js->clj (-> e js/JSON.stringify js/JSON.parse))

Advantages:

• does not require any helper function
• works for nested objects, with/without prototype
• supported in every browser

Disadvantages:

• performance might be a problem in critical pieces of codebase
• will strip any non-serializable values, like functions.

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Using Object.assign()

This approach is based on Object.assign() and it works by copying all the properties from e onto a fresh, plain (no custom prototype) #js {}.

(js->clj (js/Object.assign #js {} e))

Advantages:

• does not require any helper function

Disadvantages:

• works on flat objects, if there is another nested object withing e, it won't be converted by clj->js.
• Object.assign() is not supported by old browsers, most notably - IE.