Kevin Smith wrote:
Using suffix-? on the expression side is not backward compatible for
the ASI reasons already mentioned:
a.b?
c:
d;
I raised this problem-case, so I want to point out that we could take
other courses:
* Reckon that labels are rare and this won't bite, so let it stand, just as
a = b
(c)
is a hazard today -- and one that bites much more.
* Don't allow suffix-? to be followed by a newline.
So we're down to two possibilities:
1) Expression: prefix-?, Pattern: suffix-?
2) Expression: prefix-? Pattern: prefix-?
Consistency would seem to dictate (1).
{ p: { ?q: v } } = o;
v = o.p.?q;
You must have meant (2).
Apart from deviating from the cowpath (CoffeeScript), prefix-? is
equivalent to suffix-? as I argued in reply to Herby. We'd want to support
let ?{p: v} = o;
let v = ?o.p;
to handle the case of undefined or null 'o', of course, in which case v
would be initialized to undefined.
Stopping here to make sure we are in sync.
/be
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