I've actually replied to the op, I didn't mean to answer you directly, but the only reason I wrote that is because I could, no other reasons.
However, people unaware of the handleEvent pattern for event listeners often hope to be able to pass objects as listeners, ignoring the fact they can do that already (but they need a handleEvent method, own or inherited, in that object). There is at least another use case I can't remember now, but I do remember doing the Proxy dance before ending up realizing that the apply hook needs objects anyway. But yeah, I don't think it's a must have, specially because we can have something similar already, as shown in my example. On Wed, Dec 5, 2018 at 1:25 PM Ranando King <[email protected]> wrote: > Maybe I asked it wrong. > > How is making an ordinary object callable at all useful for anything that > can't already be easily handled via objects and functions? (looking for use > cases here) > How does this make coding easier to do and understand? (for the AST parser > and for the human) > > On Tue, Dec 4, 2018 at 11:54 PM Andrea Giammarchi < > [email protected]> wrote: > >> How about this: >> >> ```js >> >> // the poly >> if (!Symbol.callable) >> Symbol.callable = Symbol('callable'); >> >> // the setup >> class Callable extends Function { >> constructor(object) { >> super('return arguments.callee[Symbol.callable](...arguments)'); >> // sloppy mode FTW! >> Object.setPrototypeOf(this, object); >> } >> } >> >> >> // the example >> const obj = new Callable({ >> [Symbol.callable](value) { >> return value + this.value; >> }, >> value: 123 >> }); >> >> obj(7); // 130 >> >> >> ``` >> >> On Wed, Dec 5, 2018 at 12:02 AM 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 >> >
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