I was playing around with transducers that recently dropped in clojurescript.  

I started off with this which works as I expect 

(transduce (filter #(not (.hasOwnProperty prevChildMapping %))) conj [] 
nextKeys)

This returns a PersistentVector which is not what I require because I am 
working in react so I tried the following code:

(transduce (filter #(not (.hasOwnProperty prevChildMapping %))) (.-push #js[]) 
#js [] nextKeys) 

This returns the following error:

Uncaught TypeError: Array.prototype.push called on null or undefined

Could this be a bug or am I missing some other interop that is required to work 
with native objects?



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