longbot.blogg.se - What you dont know js

#What you dont know js generator
#What you dont know js update
#What you dont know js series

The "setPrototype" change event is fired if the ] of an object is changed, either by setting it with the _proto_ setter, or using tPrototypeOf(.).

In addition, "reconfigure" change events will also be fired for each property on the object. The "preventExtensions" change event is fired if the object is made non-extensible via Object.preventExtensions(.).īecause both al(.) and eeze(.) also imply Object.preventExtensions(.), they'll also fire its corresponding change event.

#What you dont know js series

See the this & Object Prototypes title of this series for more information. The "reconfigure" change event is fired if one of the object's properties is reconfigured with fineProperty(.), such as changing its writable attribute.In addition to the main "add", "update", and "delete" change types:

#What you dont know js generator

Recall this generator example from Chapter 4: run( function * main( ) Let's take a brief look at that proposed feature, called async function. In "Generators + Promises" in Chapter 4, we mentioned that there's a proposal for direct syntactic support for the pattern of generators yielding promises to a runner-like utility that will resume it on promise completion. This chapter will evolve in future editions of this title as these (and other!) features finalize. While they're likely to land, and probably will look similar, take the contents of this chapter with more than a few grains of salt. Warning: These features are all in various stages of development. With that in mind, it's already time for us to look at some of them. Babel, Traceur, and several other major transpilers already have support for some of the post-ES6 features that are most likely to stabilize. Transpilers and polyfills are how we'll bridge to these new features even before all browsers we support have implemented them. If you haven't already learned ES6, the time is past due to get on board!Īs the time of this writing, a list of future proposals and their status can be seen here ( ). We're all strongly encouraged to adopt features once they're ready instead of waiting for some official standards vote. As soon as a feature is spec-complete and has its kinks worked out through implementation experiments in a few browsers, that feature will be considered stable enough to start using. That alone is going to radically change how JS developers learn about and keep up with the language.īut even more importantly, the committee is actually going to work feature by feature.

#What you dont know js update

But even as ES6 is being finalized, the TC39 committee is already hard at work on features for ES7/2016 and beyond.Īs we discussed in Chapter 1, it's expected that the cadence of progress for JS is going to accelerate from updating once every several years to having an official version update once per year (hence the year-based naming). Please ignore this stuff.Īt the time of this writing, the final draft of ES6 ( ECMAScript 2015) is shortly headed toward its final official vote of approval by ECMA.

You Don't Know JS Yet: ES.Next & Beyond - 2nd Edition Chapter 8: Beyond ES6 NOTE:Įverything below here is previous text from 1st edition, and is only here for reference while 2nd edition work is underway.