The future of JavaScript

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The future of JS it's not about what it is, but what it could be

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who am I_ {twitter, youtube, linkedin…}.lsantos.dev software engineer_ hello@lsantos.dev

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agenda_ - How JS actually evolves - What's coming next - 👍 - stage 4 proposals - 🤩 - stage 3 proposals - 🤔 - stage 2 proposals - 👀 - stage 1 proposals - Final remarks and refs

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How JS evolves?

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JS is actually not JS

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What is JS

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What is JS

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What is JS

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What is JS this is JavaScript

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What is JS this is JavaScript

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What is JS this is JavaScript

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What is JS this is JavaScript these are the caretakers

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TC39 is organized in stages

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there are 5 stages (or 4)

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summary - Stage 0 - Draft - Stage 1 - Better draft - Stage 2 - Deﬁnition - Stage 3 - Reﬁnements - Stage 4 - Shipping 🚀

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warning

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Stage 4 things that are shipped!

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RegEx unicode sets mode

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aka: the v ﬂag

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RegEx v ﬂag

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RegEx v ﬂag

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RegEx v ﬂag

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RegEx v ﬂag https://lsantos.dev/v8-regexp-v

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RegEx v ﬂag https://lsantos.dev/mdn-regex-set

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Change array by copy

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change array by copy

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change array by copy

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change array by copy

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change array by copy https://lsantos.dev/mdn-array-copy

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Stage 3 things that are done

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temporal

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temporal

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temporal

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temporal https://blog.lsantos.dev/temporal-api/

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temporal https://lsantos.dev/tc39-temporal

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what's the status?

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testing temporal

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explicit resource management

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aka: using

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using

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using

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using

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using constructor called

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using constructor called conn[Symbol.dispose]() called as scope ends

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async using

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async using https://lsantos.dev/tc39-using

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JS native decorators

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JS native decorators

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JS native decorators

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JS native decorators

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JS native decorators

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JS native decorators: class methods

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JS native decorators: class assessors

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JS native decorators: class ﬁelds

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JS native decorators: classes

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we cannot decorate parameters https://lsantos.dev/tc39-parameter-decorators

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more resources https://lsantos.dev/tc39-decorators

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more resources https://lsantos.dev/tc39-decorators https://blog.lsantos.dev/javascript-decorators/

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Other proposals

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other proposals - New methods to Set https://lsantos.dev/tc39-set-methods

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other proposals - (async)Iterator helpers https://lsantos.dev/tc39-iterator-helpers

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Stage 2 things that are getting there

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throw expressions

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throw expressions

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throw expressions

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throw expressions https://lsantos.dev/tc39-throw

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immutable structures

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records: immutable objects

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records: immutable objects

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records: immutable objects

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tuples: immutable arrays

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tuples: immutable arrays https://lsantos.dev/tc39-records

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JSON.parseImmutable

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pipeline operator

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pipeline operator

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pipeline operator

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pipeline operator https://lsantos.dev/tc39-pipeline-op

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iterator ranges

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Iterator.range

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Other proposals

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other proposals - Array grouping https://github.com/tc39/proposal-array-grouping

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other proposals - parseImmutable https://github.com/tc39/proposal-json-parseimmutable

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other proposals - map.upsert https://github.com/tc39/proposal-upsert

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Stage 1 things

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types in JS

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types in JS https://lsantos.dev/tc39-js-types

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do expressions

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do expressions https://lsantos.dev/tc39-do-expr

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pattern matching

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pattern matching https://lsantos.dev/tc39-pattern-matching

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Other proposals

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other proposals - Function memoization https://github.com/tc39/proposal-function-memo - Reversible split https://github.com/tc39/proposal-reversible-string-split - slice notation https://github.com/tc39/proposal-slice-notation - operator overloading https://github.com/tc39/proposal-operator-overloading - object pick/omit https://github.com/tc39/proposal-object-pick-or-omit - parameter decorator https://github.com/tc39/proposal-class-method-parameter-decorators - structs and mutexes https://github.com/tc39/proposal-structs - Intl.MessageFormat https://github.com/tc39/proposal-intl-messageformat

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refs_ - https://lsantos.dev/tc-39-type-annotations - https://lsantos.dev/tc39-process - https://lsantos.dev/tc39-stage-1 - https://lsantos.dev/tc39-stage-2 - https://lsantos.dev/tc39-stage-3 - https://lsantos.dev/tc39-stage-4 - https://lsantos.dev/ecma-262