Angus Croll wrote:
Apologies if this is not yet nailed down. I'm looking for the
following details re. the arrow function grammar which I was unable to
determine from the strawman proposal:
1. Will the syntax support more than an expression in the function
body? The proposal appeared to be veering towards expression only
syntax - although this could be mitigated by the ES 6 proposed do {}
syntax.
The grammar at
http://wiki.ecmascript.org/doku.php?id=strawman:arrow_function_syntax
is clear enough: both expression and braced block body alternatives.
2. Will the grammar allow for implicit returns in the manner of Ruby,
CoffeeScript. Seems to be the case for expression bodies.
Only for that case.
If multiple statements are allowed (within block syntax) will implicit
return apply to the last statement or does explicit return become
necessary?
No, please read the sub-thread starting at
https://mail.mozilla.org/pipermail/es-discuss/2012-March/021879.html
3. Are parenthese required for zero arguments or will
let a = => doThis();
syntax be permitted (in line with CS)
This too is clearly specified by
http://wiki.ecmascript.org/doku.php?id=strawman:arrow_function_syntax#grammar_changes
ArrowFormalParameters, second right-part.
Thanks for writing. I take it from twitter you want soft-bound-|this| so
a .call or .apply (or new?) can override lexical-this?
/be
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