Brendan Eich wrote:
Allen Wirfs-Brock <mailto:[email protected]>
January 17, 2012 7:56 PM
On Jan 17, 2012, at 10:14 AM, Grant Husbands wrote:
I think others might have better answers, but it seems that the
meaning of 'break' is to stop the whole statement, and the meaning of
'continue' is to skip the inner block and hence return to
arr.alternate. I'm sorry for my woolly language, but it seems
relatively equivalent to a for loop, in which 'break' stops the whole
statement and 'continue' skips the inner block and hence returns to
the looping code.
Yes, that was the intended meaning I was trying to express. But what I
was illustrating was that for this to work a continue wihout a target
label and an equivalently located break without a target label need to
unwind to different points in the enclosing nesting structure. This
seems different (perhaps surprisingly so) from equivalent
continue/breaks nested only within blocks and an /IterationStatement/.
But that is the semantics that are need to fulfill my intent is this
particular case. Maybe this generalizes to all use reasonable cases,
but it something about it makes me feel a bit uncomfortable.
Agreed, so I'm checking my impulse to extend
http://wiki.ecmascript.org/doku.php?id=strawman:block_lambda_revival and
aiming at separated strawmen for do: and break/continue-with. Not sure
at this point when I'll get to them, more discussion welcome.
See below.
Perhaps what I'm saying is that I think "do:" is a label for the whole
callexpression, covering all lambda-block parameters. As far as the
specification goes, a continue that 'hits' the block lambda may well
be best described as a local return.
Yes, this seems about right. But can this behavior for break/continue
be explained in a way that doesn't seems arbitrarily different from
break/continue in the context of /IterationStatements/ and regular
blocks.
Maybe you can, after all, read my post on the topic from few days ago.
It is not _that_ long, it does break/continue with specifying value, and
it gives them concise meaning (which is easily updateable for case of
"label: { ....; break label; ... }" as well as "for call() {|| ...})".
/be
Herby
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