> This would seem to be a fundamental conflict between using [ ] to access
> private properties and using [ ] as a special collection element accessor
> syntax. You might take this as problem with using [ ] as a collection
> accessor or as a discovering that using [ ] as a private property access or
> is not very future proof. I think that the long term appeal of using [ ] for
> collections is compelling enough that we should re-consider the private name
> usage and define perhaps define new syntax/semantics for private name access.
> Here is a first cut:
>
> MemberExpression : MemberExpression @ Identifier
>
> where the semantics is that Identifier is evaluated as a variable reference
> and its value is used as a private name keyed property lookup. Throws if the
> value of the variable is not a private name object. We would then write my
> example as:
>
> import {collectionGetter, collectionSetter} from "@metaCollections";
> content = Name.create();
> export function StringKeyedMap() {
> this@content = Object.create(null); //note content object is a "normal
> object" and [ ] on it does regular property access
> this@collectionGetter = function(k) {return this@content [k]};
> this@collectionSetter = function(k,v) {this@content [k]=v;};
> this.size = function() {Object.getOwnPropertyNames(this@content ).length};
> //I'm lazy
> this.has = function(k) {return {}.hasOwnProperty.call(this@content,k};
> this.delete = function(k) {return delete this@content [k]}
> }
I agree 100% percent with the observations, but not with the solution.
Shouldn’t this be done the other way around, by introducing a new way of
accessing map elements? For example:
map@[key]
map.[key]
Then we can continue to use . and [] to access properties and use @[] to access
data structure elements. I wouldn’t like the asymmetry introduced by using []
for the latter task.
Axel
--
Dr. Axel Rauschmayer
[email protected]
twitter.com/rauschma
home: rauschma.de
blog: 2ality.com
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