Comma operator in Arrow functions

Jordan Harband ljharb at gmail.com
Sat Mar 14 19:46:16 UTC 2015


To me, `a=()=>1,2;` looks like `statement1,statement2` where `statement1`
is the arrow function, and `statement2` is `2`.

On Sat, Mar 14, 2015 at 12:37 PM, Caitlin Potter <caitpotter88 at gmail.com>
wrote:

> ConciseBody is an AssignmentExpression in this case, so I believe the
> comma is a syntax error.
>
>
>
> > On Mar 14, 2015, at 3:29 PM, Biju <bijumaillist at gmail.com> wrote:
> >
> > I was looking into Firefox implementation of Arrow functions
> >
> > And noticed this
> >
> > function a(){return 1,2};
> > a();
> >
> > gives "2"
> >
> >
> > But with same with Arrow functions
> >
> > a=()=>1,2;
> > a();
> >
> >
> > gives "1"
> >
> >
> > To get answer "2" in Arrow functions you need parentheses, like
> >
> > a=()=>(1,2);
> > a();
> >
> >
> >
> > Is this expected ?
> >
> >
> >
> > Cheers
> > GC
> > _______________________________________________
> > es-discuss mailing list
> > es-discuss at mozilla.org
> > https://mail.mozilla.org/listinfo/es-discuss
>
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