It is fairly tricky, all things considered. It's one of
two syntactic "ambiguities" in the language that are, rather
unconventionally, resolved with a one-off rule. Basically the rule here is
that "no statement may begin with a FunctionExpression". Consider that:
This works:
foo();
function foo(){};
This doesn't:
foo();
!function foo(){};
One is an ExpressionStatement, the other is a FunctionStatement.
The other ambiguity is curly braces being overloaded for both block
statements and object literals. That too is resolved with a one-off rule of
"no statement may begin with an object literal".
On Thu, Mar 21, 2013 at 5:47 AM, AJ ONeal <[email protected]> wrote:
> First, I concede to the empirical evidence disproving my assertion that
> the expression was hoisted. I have been shown the light (in a way such that
> it has spoken unto mine own understanding) and I now believe. Thanks
> Geerten.
>
> This is why the paren placement boggles me:
>
> 42.toString() // Errorinated
> (42).toString() // Successified
> (42.toString()) // BELETED
>
> I would expect the same behavior here
>
> function () {} ().toString()
> (function () {}).toString()
> (function () {}.toString()) // WORKS !?!?!
>
> That's why I find it odd that the placement of the parens is unimportant.
>
> I don't know what the spec says about it, but the behavior appears
> inconsistent and therefore unintuitive.
>
> AJ ONeal
>
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