Map/Set.prototype.size

Erik Arvidsson erik.arvidsson at gmail.com
Fri Oct 12 12:14:00 PDT 2012


On Fri, Oct 12, 2012 at 11:16 AM, David Bruant <bruant.d at gmail.com> wrote:
> Firefox has implement a Map/Set.prototype.size *method* to query the number
> of mapping/elements.
> It's not in the strawman. It appears in the latest draft, though weirdly
> enough Map.prototype.size is a function with an unused argument.
> What about making it an getter instead of a function? I guess we also don't
> need the extra parens to request for Map#keys, Map#values, Map#items.

For keys, values and items I think they are cleaner as methods since
they return a new iterator every time.

If they were properties, I would expect the following to always be true:

map.items === map.items

-- 
erik


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