On 03/21/11 17:42, Allen Wirfs-Brock wrote:
On Mar 21, 2011, at 1:13 PM, Erik Arvidsson wrote:
The above use case cannot be solved using private names because
private names conflict with public names.
Erik, I'm not sure that my understanding of the intended semantics of your
extension statement is totally correct. But given what I I think you intended
here is how I might imagine it desugaring using private names. Let me know what
I misinterpretered:
{
private filter;
Object.prototype.filter = function(fun) {
var publicFilter= this["filter"];
if (publicFilter) return publicFilter.apply(this,arguments);
var retval = {};
for (var key in this) {
if (fun(this[key])
retval[key] = this[key];
}
return retval;
}
function largerThanN(obj, n) {
return obj.filter(function(item) {
return item > n;
}
}
var a = [0, 1, 2, 3, 4];
print(largerThanN(a, 2));
var o = {a: 0, b: 1, c: 2, d: 3, e: 4};
print(largerThanN(0, 2));
delete Object.prototype.filter
}
You'd still run into all of the issues caused by "private filter" behaving like
a C++ #define. For example:
var foo = {filter: 34};
then pass foo to an outside client.
Waldemar
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