On Jan 18, 2012, at 10:36 AM, Gavin Barraclough wrote:
> On Jan 18, 2012, at 2:09 AM, Brendan Eich wrote:
>> x = y
>> ^{z: w}
>
> On Jan 18, 2012, at 9:05 AM, Oliver Hunt wrote:
>> Alas ^ is syntactically ambiguous in the non-argument case:
>> foo
>> ^{...}
>
> The ambiguity here doesn't seem particularly troubling. Under ASI this parses
> in a sensible fashion.
It doesn't
a
^
b
does not get any ASI, and is parsed (correctly) as a^b
> This seems unlikely to cause any confusion in real usage, since it only
> effects an object literal as an operand to a bitwise operator.
I dislike the | mode quite a lot, the only obvious reason for that proposal
existing is some peoples current love of ruby :) Why not use the C++ lambda
syntax? or the MSVC lambda syntax? or the haskell syntax? etc, etc (Obj-C uses
the ^ that we've already demonstrated is ambiguous :D )
>
> On the other hand, reuse of | seems somewhat more awkward. Based on the block
> lambda revival proposal, I believe:
> {|x = (a&b)| x}
> {|x = (a&&b)| x}
> {|x = a&b| x}
> Are all valid block lambdas, but:
> {|x = a&&b| x}
> Isn't.
> Allowing an arbitrary subset of infix operators in initializer expressions
> seems an unfortunate wart, and potentially confusing to users of the language.
>
> On Jan 18, 2012, at 2:09 AM, Brendan Eich wrote:
>> 2. The TCP conformance makes anything like function (params) {body} an
>> anti-pattern. Changing function to ^ does not avoid this problem. We want
>> block-lambdas to look different from functions.
>>
>> (2) is an overriding objection in my view.
>
> That's a fair point.
> For my tastes reusing | as delimiters to the parameter lists is a step too
> far away from function-like syntax, particularly if it restricts an arbitrary
> subset of infix operators from initializers.
>
> I'd suggest changing the terminator for the parameter list to something other
> than | ...
> {|: foo() }
> {|x,y: foo(x,y) }
> But I'd hate myself if I did. ;-)
>
> G.
>
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