PersistentArrayMap is automatically promoted to PersistentHashMap when it
reaches a specific size. This is done for performance reasons. Neither
collection is considered ordered, and you should use a different datatype
if you want ordered data.
On Sunday, August 9, 2015 at 6:31:20 PM UTC-7, Philos Kim wrote:
>
> This works well as expected. The order of input elements is maintained.
>
> (into (array-map) [[1 :a] [2 :b] [3 :c] [4 :d] [5 :e] [6 :f] [7 :g] [8
> :h]])
> ; => {1 :a, 2 :b, 3 :c, 4 :d, 5 :e, 6 :f, 7 :g, 8 :h}
>
> However, as soon as the number of the input elements exceeds 9, the order
> is not maintained any more.
>
> (into (array-map) [[1 :a] [2 :b] [3 :c] [4 :d] [5 :e] [6 :f] [7 :g] [8 :h]
> [9 :i]])
> ; => {7 :g, 1 :a, 4 :d, 6 :f, 3 :c, 2 :b, 9 :i, 5 :e, 8 :h}
>
> Is this a bug or the intended result?
>
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