Jason Orendorff wrote:
On Thu, May 9, 2013 at 11:42 PM, Mike Stay <[email protected]
<mailto:[email protected]>> wrote:
In Scala, this is desugared into
expr1.flatMap(x =>
expr2(x).flatMap(y => ...
exprN(x, y, ...).map(z =>
result(x, y, ..., z)
)
)
)
Currently comprehensions use the same protocol as for-of statements,
namely iterators. I think we definitely want them to use the same
protocol.
.map() is appealing, but to work with for-of statements, it would have
to support break, continue, and early return, either using exceptions
(like Scala's Breaks) or something new. Part of the appeal of the
iterator protocol is that it doesn't complicate break/continue/return.
Agreed. JS ain't Scala.
Note for Mike Stay, in case it helps a bit (just syntax): we agreed to
use LTR order, so:
[for (x of expr1) for (y of expr2(x)) result(x, y)]
to shorten your example a bit.
Separately, for the list: are arrow-functions lexically transparent to
super and arguments? I hope so! For this kind of desugaring, if
nothing else.
'super' like 'this' is lexical -- the outer function's same-named
keyword meaning.
'arguments' per
http://wiki.ecmascript.org/doku.php?id=harmony:arrow_function_syntax is
an error. Perhaps we should change this to match the keywords. Allen?
/be
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