Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Node conf ar 2018.
Search
Willian Martins
October 19, 2018
Technology
0
540
Node conf ar 2018.
Willian Martins
October 19, 2018
Tweet
Share
More Decks by Willian Martins
See All by Willian Martins
Empirical Observations on the The Future of Scalable UI Architecture
wmsbill
0
150
Além do else! Categorizando Pokemóns com Pattern Matching no JavaScript
wmsbill
0
860
De volta ao Futuro do JS: As próximas features e propostas incríveis
wmsbill
0
98
Back to the future of JS II: Beyond what we can foresee
wmsbill
0
120
A, B, C. 1, 2, 3. Iterables you and me.
wmsbill
0
94
Back to the future of JS II: Beyond what we can foresee
wmsbill
0
110
Back to the future of JS.
wmsbill
0
11
Back to the future of JS
wmsbill
1
76
Back to the future of JS
wmsbill
2
270
Other Decks in Technology
See All in Technology
タスクって今どうなってるの?3.14の新機能 asyncio ps と pstree でasyncioのデバッグを (PyCon JP 2025)
jrfk
1
250
Why React!?? Next.jsそしてReactを改めてイチから選ぶ
ypresto
10
4.3k
ACA でMAGI システムを社内で展開しようとした話
mappie_kochi
0
220
業務自動化プラットフォーム Google Agentspace に入門してみる #devio2025
maroon1st
0
180
AI Agentと MCP Serverで実現する iOSアプリの 自動テスト作成の効率化
spiderplus_cb
0
470
SoccerNet GSRの紹介と技術応用:選手視点映像を提供するサッカー作戦盤ツール
mixi_engineers
PRO
1
160
データエンジニアがこの先生きのこるには...?
10xinc
0
440
Oracle Base Database Service 技術詳細
oracle4engineer
PRO
11
77k
GopherCon Tour 概略
logica0419
2
170
いま注目しているデータエンジニアリングの論点
ikkimiyazaki
0
580
Escaping_the_Kraken_-_October_2025.pdf
mdalmijn
0
120
「Verify with Wallet API」を アプリに導入するために
hinakko
1
220
Featured
See All Featured
Build The Right Thing And Hit Your Dates
maggiecrowley
37
2.9k
GraphQLとの向き合い方2022年版
quramy
49
14k
GraphQLの誤解/rethinking-graphql
sonatard
73
11k
Fireside Chat
paigeccino
40
3.7k
Facilitating Awesome Meetings
lara
56
6.6k
[RailsConf 2023] Rails as a piece of cake
palkan
57
5.9k
Fashionably flexible responsive web design (full day workshop)
malarkey
407
66k
Helping Users Find Their Own Way: Creating Modern Search Experiences
danielanewman
30
2.9k
CSS Pre-Processors: Stylus, Less & Sass
bermonpainter
358
30k
Navigating Team Friction
lara
189
15k
Connecting the Dots Between Site Speed, User Experience & Your Business [WebExpo 2025]
tammyeverts
9
570
The Psychology of Web Performance [Beyond Tellerrand 2023]
tammyeverts
49
3.1k
Transcript
¡Hola!
https://github.com/tc39/proposals
v. NodeConf Ar
@wmsbill What is this?
@wmsbill this in the global scope Browser - window Web
worker - self NodeJS - module.exports
@wmsbill this inside a function?
@wmsbill this inside a function?
@wmsbill What is this?
@wmsbill What is this?
@wmsbill this inside a function Browser - window NodeJS -
global object
@wmsbill this with new operator
@wmsbill this with new operator
@wmsbill this with strict mode
@wmsbill this with strict mode
@wmsbill Setting this value Function.prototype.call Function.prototype.apply Function.prototype.bind new operator Object
member function
@wmsbill Setting this value
@wmsbill How to make this predictable? Reasoning the value of
this is tricky Function.prototype.bind Arrow function () => {}
None
With .bind()
With Arrow
@wmsbill Calling a knowing function
@wmsbill Extracting a method from an object
None
@wmsbill Two syntaxes Unary : :context.method() Binary context: :method()
@wmsbill Unary syntax
@wmsbill Binary syntax
@wmsbill
@wmsbill
@wmsbill
@wmsbill Bind operator is good for virtual methods But relies
on this to be bound
@wmsbill Composing without this
@wmsbill
@wmsbill
None
@wmsbill Pipeline operator |> It is a syntax sugar for
function composition It creates a way to streamline a chain of functions
@wmsbill Pipeline operator |>
@wmsbill
@wmsbill
@wmsbill
@wmsbill Function with more params
@wmsbill Function with more params
@wmsbill Awaiting a function
@wmsbill Awaiting a function
@wmsbill Awaiting a function
@wmsbill Awaiting a function
@wmsbill Awaiting a function
None
@wmsbill Smart pipeline
@wmsbill Smart pipeline Two types bare style and topic style
() or [] are disallowed in bare style When () or [] is needed, topic style is used # token is subject to change
@wmsbill What about curry?
None
@wmsbill F# pipeline proposal Extends the minimal proposal with an
await step Await step waits for the resolution of the previous step
@wmsbill F# pipeline proposal
@wmsbill
@wmsbill Partial application f(…) arity = n; partialapp(f(…)) arity =
m; m < n
@wmsbill
@wmsbill
@wmsbill Partial application in ES Achievable by Function.prototype.bind .bind() binds
context and parameters
@wmsbill
@wmsbill What about currying? We can achieve partial application with
curry Curry ≠ Partial application Curry returns arity n-1
@wmsbill
@wmsbill Partial application with arrow function
None
@wmsbill Partial application proposal Creates two new parameters tokens ?
For single argument . . . for multiple parameters (not in the initial spec anymore)
@wmsbill Partial application syntax
@wmsbill With arbitrary parameter
None
@wmsbill Partial application in template string
@wmsbill Partial application in template string
None
@wmsbill The . . . token Spread the unbound parameters
Useful when you want to bound first or last parameter
@wmsbill The . . . token
@wmsbill The . . . token
@wmsbill Partial application + pipeline
@wmsbill Partial application + pipeline
@wmsbill Should I use all of it in production? These
proposal are in very early stage The adoption of one, may change the syntax/semantics of other Not production ready (yet)
https://medium.com/@wmsbill https://twitter.com/wmsbill
[email protected]
https://www.smashingmagazine.com/2018/10/taming-this-javascript-bind- operator/
¡Gracias!