Can anybody explain to me why it is that something like
function baz(bar) {
var foo = {};
if (!bar in foo) { return false; }
// do stuff
}
is legit whereas
function baz(bar) {
var foo = {};
bar in foo || return false;
// do stuff
}
gives a syntax error?
Just in terms of the logic it seems like they should both do the same
thing, i.e. if bar is not in foo, then return false. I suppose the
difference between the two is that the first form _executes_ some code
if the conditional is false, whereas the second form _evaluates_
something if the expression on the left is falsey? I'm not really all
that surprised that it doesn't work, but I can't seem to find anything
online or even in the spec that explains exactly why that is; I'm sure
it's in there, I just can't find it.
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