Hi,
I've been going through the spec trying to figure out a few edge cases
for block bindings. It appears that there is not a functioning demo for
these (Traceur is mostly working with var semantics, Firefox/Chrome are
not at all spec-compliant), so just thought I would ask to get a better
understanding of the expected behavior.
1. If I'm interpreting this correctly, let and const declarations will
throw an error if used with an identifier that is already defined within
the same block. So I think that means this should throw an error:
function f() {
var count = 10;
let count = 20; // error?
}
However, it seems like this would not (block variable shadowing function
variable?):
function f() {
var count = 10;
if (condition) {
let count = 20; // no error?
}
}
And I would assume this is the same (using let instead of var):
function f() {
let count = 10;
if (condition) {
let count = 20; // no error?
}
}
Am I correct in my understanding of these?
2. Since ECMAScript 6 is always running in strict mode, I'm assuming
that attempting to assign to a declared constant would throw an error
(in that it behaves similar to a non-writable property in strict mode)?
const MAX_ITEMS = 30;
MAX_ITEMS = 25; // error?
Is that correct?
Thanks,
Nicholas
--
___________________________
Nicholas C. Zakas
http://www.nczonline.net
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