One way to solve this might currently include extending `Array` and overriding`indexOf` in a derived class to reflect the `Option` behavior you're after.
On Wednesday, July 5, 2017 8:10:05 PM CEST Boris Cherny wrote: > Hey guys, > > What would it take to get block scoped prototype extensions into JavaScript? > I’m curious to get some thoughts before I write a proposal. > > The use case is similar to Scala’s block scoped implicits. In my application > code I want Array.prototype.indexOf to return an Option<number>, rather > than number | -1. If I patch Array’s prototype directly, it will break > other libraries in my project. It would be nice to have a way to extend the > prototype for just a block, or just a file. > > Would a combination of block-scoped imports (maybe dynamic imports, to patch > the prototype) and some sort of onExitBlock hook (to unpatch the prototype) > be enough to implement this? Has anyone else thought about this sort of > feature? > > Boris > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss
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