Slide 1

Slide 1 text

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

Slide 2

Slide 2 text

who am I_ {twitter, youtube, linkedin…}.lsantos.dev software engineer_ [email protected]

Slide 3

Slide 3 text

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

Slide 4

Slide 4 text

How JS evolves?

Slide 5

Slide 5 text

JS is actually not JS

Slide 6

Slide 6 text

What is JS

Slide 7

Slide 7 text

What is JS

Slide 8

Slide 8 text

What is JS

Slide 9

Slide 9 text

What is JS this is JavaScript

Slide 10

Slide 10 text

What is JS this is JavaScript

Slide 11

Slide 11 text

What is JS this is JavaScript

Slide 12

Slide 12 text

What is JS this is JavaScript these are the caretakers

Slide 13

Slide 13 text

TC39 is organized in stages

Slide 14

Slide 14 text

there are 5 stages (or 4)

Slide 15

Slide 15 text

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

Slide 16

Slide 16 text

warning

Slide 17

Slide 17 text

Stage 4 things that are shipped!

Slide 18

Slide 18 text

RegEx unicode sets mode

Slide 19

Slide 19 text

aka: the v flag

Slide 20

Slide 20 text

RegEx v flag

Slide 21

Slide 21 text

RegEx v flag

Slide 22

Slide 22 text

RegEx v flag

Slide 23

Slide 23 text

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

Slide 24

Slide 24 text

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

Slide 25

Slide 25 text

Change array by copy

Slide 26

Slide 26 text

change array by copy

Slide 27

Slide 27 text

change array by copy

Slide 28

Slide 28 text

change array by copy

Slide 29

Slide 29 text

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

Slide 30

Slide 30 text

Stage 3 things that are done

Slide 31

Slide 31 text

temporal

Slide 32

Slide 32 text

temporal

Slide 33

Slide 33 text

temporal

Slide 34

Slide 34 text

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

Slide 35

Slide 35 text

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

Slide 36

Slide 36 text

what's the status?

Slide 37

Slide 37 text

testing temporal

Slide 38

Slide 38 text

explicit resource management

Slide 39

Slide 39 text

aka: using

Slide 40

Slide 40 text

using

Slide 41

Slide 41 text

using

Slide 42

Slide 42 text

using

Slide 43

Slide 43 text

using constructor called

Slide 44

Slide 44 text

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

Slide 45

Slide 45 text

async using

Slide 46

Slide 46 text

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

Slide 47

Slide 47 text

JS native decorators

Slide 48

Slide 48 text

JS native decorators

Slide 49

Slide 49 text

JS native decorators

Slide 50

Slide 50 text

JS native decorators

Slide 51

Slide 51 text

JS native decorators

Slide 52

Slide 52 text

JS native decorators: class methods

Slide 53

Slide 53 text

JS native decorators: class assessors

Slide 54

Slide 54 text

JS native decorators: class fields

Slide 55

Slide 55 text

JS native decorators: classes

Slide 56

Slide 56 text

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

Slide 57

Slide 57 text

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

Slide 58

Slide 58 text

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

Slide 59

Slide 59 text

Other proposals

Slide 60

Slide 60 text

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

Slide 61

Slide 61 text

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

Slide 62

Slide 62 text

Stage 2 things that are getting there

Slide 63

Slide 63 text

throw expressions

Slide 64

Slide 64 text

throw expressions

Slide 65

Slide 65 text

throw expressions

Slide 66

Slide 66 text

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

Slide 67

Slide 67 text

immutable structures

Slide 68

Slide 68 text

records: immutable objects

Slide 69

Slide 69 text

records: immutable objects

Slide 70

Slide 70 text

records: immutable objects

Slide 71

Slide 71 text

tuples: immutable arrays

Slide 72

Slide 72 text

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

Slide 73

Slide 73 text

JSON.parseImmutable

Slide 74

Slide 74 text

pipeline operator

Slide 75

Slide 75 text

pipeline operator

Slide 76

Slide 76 text

pipeline operator

Slide 77

Slide 77 text

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

Slide 78

Slide 78 text

iterator ranges

Slide 79

Slide 79 text

Iterator.range

Slide 80

Slide 80 text

Other proposals

Slide 81

Slide 81 text

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

Slide 82

Slide 82 text

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

Slide 83

Slide 83 text

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

Slide 84

Slide 84 text

Stage 1 things

Slide 85

Slide 85 text

types in JS

Slide 86

Slide 86 text

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

Slide 87

Slide 87 text

do expressions

Slide 88

Slide 88 text

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

Slide 89

Slide 89 text

pattern matching

Slide 90

Slide 90 text

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

Slide 91

Slide 91 text

Other proposals

Slide 92

Slide 92 text

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

Slide 93

Slide 93 text

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

Slide 94

Slide 94 text

This talk: https://lsantos.dev/whats-next-for-js

Slide 95

Slide 95 text

thank you_ lsantos.dev