Efficient heaps in purely functional languages

Question

As an exercise in Haskell, I\'m trying to implement heapsort. The heap is usually implemented as an array in imperative languages, but this would be hugely inefficient in purely

Answer 1

I tried to port standard binary heap into functional settings. There is an article with described idea: A Functional Approach to Standard Binary Heaps. All the source code listings in the article are in Scala. But it might be ported very easy into any other functional language.