I hope this is the right place to ask this question:
When are LexicalEnvironment and VariableEnvironment ever not the same? My
understanding, derived from ECMA-262 is as follows:
(1) Mainly needed for "with", because properties should be found during
identifier lookup, but new bindings should be made in the surrounding
environment.
(2) Function definitions: function declarations use the VariableEnvironment as
scope, while function expressions use the LexicalEnvironment. Rationale? To
make function declarations function-global (=ignoring with statements)?
Did I miss any differences?
The following code can be used to test (2). Console output is "bar" on Firefox
and Rhino, "abc" on V8 (Node.js). If you use a function expression, the output
is "bar" on all platforms.
var foo = "abc";
with({ foo: "bar" }) {
function f() {
console.log(foo);
}
f();
}
Any confirmations are highly appreciated.
Greetings,
Axel
--
Dr. Axel Rauschmayer
[email protected]
twitter.com/rauschma
home: rauschma.de
blog: 2ality.com
_______________________________________________
es-discuss mailing list
[email protected]
https://mail.mozilla.org/listinfo/es-discuss
