[whatwg] native ordered dictionary data type in web storage draft

Patrick Mueller pmuellr at muellerware.org
Tue Apr 14 07:18:31 PDT 2009

The last paragraph in section 4.6 of the Web Storage draft (10 April 
2009), mentions a "native ordered dictionary data type".  The URL to the 
section in the draft is here:


This is the first time I've seen the requirement for such a beast.  You 
can understand the desire for it, given the context, but still.  Does 
anything else in JavaScript make use of such a data structure?  It's not 
clear to me how you would even use it, without something like a list 
comprehension, or some other functional construct.  It's hard to imagine 
how someone might make use of the ordered-ness in a plain old for/in 
loop, for instance.

It would also be impossible, in the JavaScript in use today, AFAIK, to 
emulate this with user-land JavaScript.

Patrick Mueller

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