What about protocols?
> On 13 בפבר 2014, at 16:46, Kevin Smith <[email protected]> wrote: > > I'm not sure to what extent this has been discussed previously, but I think > we should consider merging relationships and bind syntax. > > The relationships strawman introduces two new built-in symbols: @geti and > @seti. I will instead use the more descriptive names: `Symbol.referenceGet` > and `Symbol.referenceSet`. > > The basic idea is that arbitrary objects can be used as the "referenced name" > in a Reference object. When GetValue or PutValue is called on those kinds of > reference objects, behavior is delegated to the functions defined on the > "reference name" object at the appropriate symbol. If the required method is > not defined on the name object, then an exception is thrown. > > The operator "::" creates such a reference object. > > The following code should illustrate the idea: > > Function.prototype[Symbol.referenceGet] = function(target) { return this > }; > > Map.prototype[Symbol.referenceGet] = function(target) { > > while (target !== null) { > > if (this.has(target)) > return this.get(target); > > target = Object.getPrototypeOf(target); > } > > return void 0; > }; > > Map.prototype[Symbol.referenceSet] = Map.prototype.set; > > // Using a Map as a set of internal fields: > var obj = {}; > var field = new Map; > > obj::field = "value"; > obj::field; // "value" > > // Using a function as an extension method: > function f() { return this.x; } > > obj.x = "abc"; > obj::f(); // "abc"; > >
_______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
