* Allen Wirfs-Brock wrote:
>On Dec 7, 2013, at 4:55 PM, John Cowan wrote:
>> Allen Wirfs-Brock scripsit:
>>
>>> Similarly, the JSON texts:
>>> {"1": 1, "2", 2}
>>> and
>>> {"2": 2, "1": 1}
>>>
>>> or the JSON texts:
>>> {"a": 1, "a": 2}
>>> and
>>> {"a": 2, "a": 1}
>>>
>>> have an ordering of the object members that must be preserved by the
>>> parser in order for downstream semantics to be applied.
>>
>> I cannot accept this statement without proof. Where in the ECMAscript
>> definition does it say this?
>In other words, ECMA-262 explicitly specifies that when multiple
>occurrences of the same member name occurs in a JSON object, the value
>associated with the last (right-most) occurrence is used. Order matters.
>
>A similar analysis applies to the first example.
Your analysis does not demonstrate that `JSON.parse` preserves ordering.
I am confident that even in the current ES6 draft `JSON.stringify` does
not preserve ordering even if `JSON.parse` somehow did. It's based on
`Object.keys` which does not define ordering as currently proposed. If
you can re-create the key-value-pair order in your first example from
the output of `JSON.parse` without depending on implementation-defined
behavior, seeing the code for that would be most instructive.
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Björn Höhrmann · mailto:[email protected] · http://bjoern.hoehrmann.de
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