In feature(ES4), ES may have OptionalParameter, that will cause trouble
{ |a ,b = 1 | c | d | e | f }
is
{ (|a ,b = 1 |) c | d | e | f }
or
{ (|a ,b = 1 | c) | d | e | f }
Regards,
Eric Suen
----- Original Message -----
From: "Yuh-Ruey Chen" <[EMAIL PROTECTED]>
To: "Brendan Eich" <[EMAIL PROTECTED]>
Cc: "Eric Suen" <[EMAIL PROTECTED]>; "Maciej Stachowiak"
<[EMAIL PROTECTED]>; "es-discuss"
<[email protected]>
Sent: Wednesday, December 03, 2008 8:56 PM
Subject: Re: Allen's lambda syntax proposal
> Brendan Eich wrote:
>> C# uses (a, b, c) => ... but in JS the comma operator makes that nasty
>> to parse top-down. I think the only candidates have to be of the form
>>
>> ^(a, b, c) {...}
>>
>> (^ could be another character, but it seems to beat \ as others have
>> noted), or else the Smalltalky
>>
>> { |a, b, c| ... }
>>
>> At this point we need a bake-off, or a convincing argument against the
>> unusual vertical bar usage.
>
> Here's a possible technical issue that might not apply to ES: Ruby
> blocks params can't have default arguments according to
> http://eigenclass.org/hiki.rb?Changes+in+Ruby+1.9#l9 :
>
> The new syntax allows to specify default values for block arguments,
> since
>
> {|a,b=1| ... }
>
>
> is said to be impossible with Ruby's current LALR(1) parser, built
> with bison.
>
>
>
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