arrow function syntax simplified

Brendan Eich brendan at mozilla.com
Tue Mar 27 14:31:22 PDT 2012


On Mar 27, 2012, at 5:28 PM, Brendan Eich <brendan at mozilla.com> wrote:

> We went over this in the thread Isaac started. You'd need a [no LineTerminator here] between ) and {, and then the syntax looks too much like a juxtaposed parenthesized expression and block.
> 
> The latter problem, a lack of syntactic distinctiveness, also felled there entry

Thanks, iPad!

"the recently mooted", of course.

/be


> mooted {(x)x} block-lambda alternative syntax.
> 
> /be
> 
> On Mar 27, 2012, at 5:22 PM, Russell Leggett <russell.leggett at gmail.com> wrote:
> 
>> On Tue, Mar 27, 2012 at 3:43 PM, Brendan Eich <brendan at mozilla.com> wrote:
>> http://wiki.ecmascript.org/doku.php?id=strawman:arrow_function_syntax
>> 
>> Use => only with an expression body (do-expressions if accepted allow statements and combined with => compete with block-lambdas).
>> 
>> Use -> only with body block, as for long-form function.
>> 
>> Just a thought - if a block is required on the RHS of the ->, why not just skip the arrow? I could be mistaken, but would it be just as easy grammatically to do:
>> 
>>     array.forEach((v, i) { if (i & 1) oddArray[i >>> 1] = v; });
>> 
>> instead of:
>> 
>>      array.forEach((v, i) -> { if (i & 1) oddArray[i >>> 1] = v; });
>> 
>> This way, there would only be one kind of arrow.  Without an arrow its basically just removing the keyword function, and therefore maybe a little bit easier to transition. With the arrow added, you can expect a bigger jump in semantics.
>> 
>> - Russ
>> 
>>  
>> 
>> I deferred other accretions.
>> 
>> In a rush here, comments and corrections welcome and I'll edit as I can.
>> 
>> /be
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