2012/10/10 David Bruant bruan...@gmail.com
About making the restriction for membranes official could be done by
introducing branded proxies which output values (through
get/getOwnPropertyDescriptor/getPrototypeOf... traps) would also be
branded proxies (with the same brand). Brand validation
This wasn't totally unexpected but seriously made me go WTF. It appears
that arguments to regexp.test are cast to a string. This was bad for me
since I was writing a js parser at the time and checking the argument to
see if it matched one of the reserved words. See the example below:-
On Wednesday, October 10, 2012 at 6:19 AM, gaz Heyes wrote:
This wasn't totally unexpected but seriously made me go WTF. It appears that
arguments to regexp.test are cast to a string. This was bad for me since I
was writing a js parser at the time and checking the argument to see if it
Hi,
I've tried the following on Firefox:
function f(a, b = 34, c){
console.log('b', b)
}
f(1, undefined, 43)
and got Exception: parameter(s) with default followed by parameter without
default
It seems intentional, but I wonder why it's been decided this way.
It seems that default
You /are/ actually passing in a second argument though, your second
argument is `undefined`. Default arguments aren't meant to replace
`undefined` values, they're meant to be permissible for omission.
--
Keith Cirkel
On 10 October 2012 14:19, David Bruant bruan...@gmail.com wrote:
Hi,
I've
On 9 October 2012 01:55, Brendan Eich bren...@mozilla.org wrote:
Andreas Rossberg wrote:
Let me try again. How about the following desugaring?
function f(x1 = e1, ~~~, xN = eN) { body }
means
function f(x1, ~~~, xN) {
if (x1 === undefined) x1 = e1;
~~~
if (xN ===
2012/10/10 Keith Cirkel es-disc...@keithcirkel.co.uk
You /are/ actually passing in a second argument though, your second
argument is `undefined`. Default arguments aren't meant to replace
`undefined` values, they're meant to be permissible for omission.
From
On Oct 10, 2012, at 6:33 AM, Andreas Rossberg wrote:
On 9 October 2012 01:55, Brendan Eich bren...@mozilla.org wrote:
Andreas Rossberg wrote:
Let me try again. How about the following desugaring?
function f(x1 = e1, ~~~, xN = eN) { body }
means
function f(x1, ~~~, xN) {
if
On Oct 10, 2012, at 6:19 AM, David Bruant wrote:
Hi,
I've tried the following on Firefox:
function f(a, b = 34, c){
console.log('b', b)
}
f(1, undefined, 43)
and got Exception: parameter(s) with default followed by parameter without
default
It seems intentional, but
On Oct 10, 2012, at 6:39 AM, David Bruant wrote:
2012/10/10 Keith Cirkel es-disc...@keithcirkel.co.uk
You /are/ actually passing in a second argument though, your second argument
is `undefined`. Default arguments aren't meant to replace `undefined` values,
they're meant to be permissible
I notice that the current draft spec says:
The ExpectedArgumentCount of a FormalParameterList is the
number of FormalParameters to the left of either the rest parameter
or the first FormalParameter with an Initialiser.
This aligns ExpectedArgumentCount with built-in functions like
ExpectedArgumentCount is used to the the length property of function objects.
We've discussed this extensively before and there doesn't seem to be many
plausible use cases for the function length property.
Given that length isn't very useful alignment with the conventions used for the
On Oct 10, 2012, at 9:12 AM, Allen Wirfs-Brock al...@wirfs-brock.com wrote:
On Oct 10, 2012, at 6:39 AM, David Bruant wrote:
2012/10/10 Keith Cirkel es-disc...@keithcirkel.co.uk
You /are/ actually passing in a second argument though, your second argument
is `undefined`. Default
We've discussed this extensively before and there doesn't seem to be many
plausible use cases for the function length property.
Here's the only use case that I've encountered (admittedly not particularly
strong): Overriding the behavior of a function/method based on the
signature of an input
Oliver Hunt wrote:
On Oct 10, 2012, at 9:12 AM, Allen Wirfs-Brock al...@wirfs-brock.com
mailto:al...@wirfs-brock.com wrote:
On Oct 10, 2012, at 6:39 AM, David Bruant wrote:
2012/10/10 Keith Cirkel es-disc...@keithcirkel.co.uk
mailto:es-disc...@keithcirkel.co.uk
You /are/ actually
Agreed, desugaring is helpful for checking intuition or a design idea
but it can be the wrong tool for the job.
Main thing we should discuss is Andreas's idea of a separate scope for
parameter default expressions, shadowed by the function's body scope.
/be
Allen Wirfs-Brock wrote:
On Oct
2012/10/10 David Bruant bruan...@gmail.com
Having this uniqueness invariant is what enforces graph isomorphism. In a
nutshell, unlike the current proposal, traps can still return proxies, but
it has to be the exact proxy that can be returned is decided in advanced,
pretty much like the
2012/10/10 Tom Van Cutsem tomvc...@gmail.com
2012/10/10 David Bruant bruan...@gmail.com
Having this uniqueness invariant is what enforces graph isomorphism. In a
nutshell, unlike the current proposal, traps can still return proxies, but
it has to be the exact proxy that can be returned is
Allen Wirfs-Brock wrote:
I proposed that we replace Program in this context with Script.
This is much less confusing and matches the most common manifestation
of an ES Program as an HTML script block.
+1 -- it the term at least some engines use, and it makes more sense for
eval, or at least
Tom Van Cutsem wrote:
We should also be wary of adding even more Proxy constructors, as
we'll otherwise end up with a combinatorial explosion (revocable
branded proxies, branded proxies with a symbol whitelist, etc.)
But didn't David find a way to avoid Proxy.revocable, namely make
+1 Tracuer uses 'Program' and that makes it too easy to forget that
the program consists of multiple Program-s
jjb
On Wed, Oct 10, 2012 at 11:56 AM, Brendan Eich bren...@mozilla.com wrote:
Allen Wirfs-Brock wrote:
I proposed that we replace Program in this context with Script. This
is
David Bruant wrote:
2012/10/10 Brendan Eich bren...@mozilla.org mailto:bren...@mozilla.org
Tom Van Cutsem wrote:
We should also be wary of adding even more Proxy constructors,
as we'll otherwise end up with a combinatorial explosion
(revocable branded proxies,
On Wednesday, October 10, 2012 at 6:14 PM, John J Barton wrote:
+1 Tracuer uses 'Program' and that makes it too easy to forget that
the program consists of multiple Program-s
jjb
On Wed, Oct 10, 2012 at 11:56 AM, Brendan Eich bren...@mozilla.com wrote:
Allen Wirfs-Brock wrote:
On Oct 10, 2012 4:20 PM, Rick Waldron waldron.r...@gmail.com wrote:
On Wednesday, October 10, 2012 at 6:14 PM, John J Barton wrote:
+1 Tracuer uses 'Program' and that makes it too easy to forget that
the program consists of multiple Program-s
jjb
On Wed, Oct 10, 2012 at 11:56 AM,
I'm tarting to work on the global scope/program/module level of the
specification.
One of the pieces of awkward ES specification terminology has been the use of
the word Program as the name for a global top-level StatementList. A ES
Program is commonly only a single fragment of what most of
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