On 3/23/14 at 11:24 AM, [email protected] (Brendan Eich) wrote:
Marcus Stade wrote:
This is assuming that the `current` or `prev` property is
indeed implemented by the engine and not user land, as that
indeed both carries implementation cost and the risk out
running out of sync. Is there any way other than generator
functions to implement iterators? Are any ol' object with a
function called `next` an iterator?
Any old object. It's a structural or "duck-typed" protocol.
We won't therefore be adding complexity, which is also bad on
its own. KISS wins here. More elaborate protocols for harder or
let's say rarer cases are fine and not part of the mandatory minimum.
It seems it should be easy for any user or library to introduce
in generalized intermediate object which implements the
`current` or 'prev' property, so it doesn't need to be in the language.
Cheers - Bill
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