Herby Vojčík <mailto:[email protected]>
January 23, 2012 11:51 AM
Brendan Eich-2 wrote:
Herby Vojčík<mailto:[email protected]>
January 23, 2012 3:21 AM
It can be solved this way:
module {
private foo, bar;
export function factory1 (args) { ... }
export function factory2 (args) { ... }
but then foo and bar are known to the rest of the module. It was not
the premise.
There is nothing wrong with this solution, and everything right. If you
want to keep foo and bar secret from other modules, you've done so. If
you, for some reason, want to keep them secret from other contents of
this module, use a block (but you'll have a harder time exporting --
export must come at module top level).
In other way, it is impossible to have truly lexical-local private names.
No, the private binding form that is desugared from
private foo;
to
const foo = Name.create("foo");
or better (with hygiene to use the right Name, etc.) is lexical in its
binding structure.
You must define them all at the upper level, tens or maybe hundreds of lines
back.
What?
We're talking about singletons -- you seemed to agree. Why should deeply
nested declarations be evaluated only once (at compile time? What does
that mean exactly? Or somehow first-run-only, at their nesting depth...)?
There's no difference here between other forms, including regular
expression literals and function expressions and declarations. A
function declaration in particular is evaluated ot a fresh object bound
to the declared name. The desugaring is complicated by hoisting, but
consider a magic hoist primitive:
function bar(params) {body}
desugars to
hoist bar = function bar(params) {body};
and you get a fresh object per evaluation.
You want to mislocate private for some reason. Why? Are you focused too
much on class constructors?
The module with two functions sharing private names use-case is
addressed by module-scope private declarations. What is the syntax you
want there?
/be
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