Edit: the wrapper needs to be a function, so ignore that last email. It's wrong.
----- Isiah Meadows [email protected] www.isiahmeadows.com On Tue, Dec 4, 2018 at 2:14 PM Isiah Meadows <[email protected]> wrote: > > BTW, there are proxies [1], and one of the proxy hooks is to intercept > calls [2]. > > [1]: > https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy > [2]: > https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/apply > > Your "callable object" proposal would be literally as simple as this > to implement: > > ```js > const callable = Symbol.for("callable") > const handler = { > apply(target, thisArg, argsList) { > return Reflect.apply(target[callable], thisArg, argsList) > }, > } > function makeCallable(obj) { return new Proxy(obj, handler) } > > // Your example, ported > const obj = makeCallable({ > [callable]: function (...args) { return this[Symbol.for('value')] }, > [Symbol.for(''value')]: 'value', > }) > > assert(obj() === 'value') > obj[callable] = () => 1 > assert(obj() === 1) > ``` > > ----- > > Isiah Meadows > [email protected] > www.isiahmeadows.com > On Tue, Dec 4, 2018 at 12:02 PM Sultan <[email protected]> wrote: > > > > Something along the lines of Symbol.iterator protocol for defining callback > > objects i.e: Symbol.callable: > > > > const obj = { > > [Symbol.callable]: function (...args) { return > > this[Symbol.for('value')] }, > > [Symbol.for(''value')]: 'value', > > } > > > > assert(obj() === 'value') > > _______________________________________________ > > es-discuss mailing list > > [email protected] > > https://mail.mozilla.org/listinfo/es-discuss _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
