On 31.12.2010 19:16, Marc Harter wrote:
The correct and full explanation is here:
http://dmitrysoshnikov.com/ecmascript/chapter-5-functions/#question-about-surrounding-parentheses
This is good Dmitry, thanks for sharing, I understood what you could and could
not do but didn't know the reasons to that depth.
The thing is that (almost?) all explanations (I repeat -- books,
articles, etc) talked about `calling`, that is wrong. While the reason
is that parentheses at the end are not parentheses of a call
(`Arguments` production), but just a grouping operator (without an
expression inside) which causes the error.
function foo(x) {
alert(x)
}(1);
There is no error. But it's not a call. It's a FD and the following
grouping operator with the expression `1`. I.e. it's:
function foo(x) {
alert(x)
}
(1);
And since an empty grouping operator () causes an error, exactly this is
the reason:
function foo(x) {
alert(x)
}();
and not in "FD cannot be _called_", since it's not about calling at all.
Dmitry.
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