Comment #2 on issue 278 by isaacschlueter: Can't change a function's "name"
property
http://code.google.com/p/v8/issues/detail?id=278
Hm, it seems that you're right, Safari also sets the {ReadOnly} flag on
Function.name. Firefox lets you set a name for anonymous functions, but
you can't do
that in the spidermonkey shell, which is interesting.
Is this just a common implementation, or does the spec dictate this
behavior? I
can't seem to find *any* mention of Function.name in section 13 of the
ECMAScript 3 spec.
The use case is not terribly vital or common. I have some code that wraps a
function, and the intent was to have it be as transparent as possible to
the calling
code. So, if I do this:
wrap( function foo (n) {return n} );
it should return a different function with the same apparent properties
(toString()
result and name, specifically). The way that I was doing this is like this:
wrapFunction = function (fn) {
var f = function () {
return fn.apply(
this, Array.prototype.slice.call(arguments,0)
);
};
f.toString = function () { return fn.toString(); };
f.name = fn.name;
f.prototype = wrapObject(fn.prototype);
for (var i in fn) {
if (!(i in f)) f[i] = wrap(fn[i]);
}
return f;
};
I'm using this to create a "safe" sandbox for running code. I don't expect
it to be
a perfect protection against all possible malicious code, so being slightly
detectable is not necessarily a problem. However, I would prefer that the
wrapped
function be effectively identical to its parent, in case there are
situations where
function.name is used somehow.
I could get around that by using eval, but I'd hoped there was a "cleaner"
way:
var f = eval("function " + fn.name + "() {"+
"return fn.apply("+
"this, Array.prototype.slice.call(arguments,0)"+
");"+
"};");
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