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
The Dark Side of JavaScript
Search
Lucas Santos
May 17, 2021
Technology
97
0
Share
Embed
Copy iframe code
Copy JS code
Copy link
Start on current slide
The Dark Side of JavaScript
Lucas Santos
May 17, 2021
More Decks by Lucas Santos
See All by Lucas Santos
The Hitchhiker's Guide for an Amazing API with TypeScript
khaosdoctor
0
120
Escalando globalmente com TypeScript e JavaScript na Klarna
khaosdoctor
0
220
The future of JavaScript
khaosdoctor
0
96
TypeScript tips that could save your life
khaosdoctor
0
250
É hora de falar sobre Deno
khaosdoctor
0
93
JS Software testing for beginners
khaosdoctor
0
100
Ambientes dinâmicos com GitHub Actions
khaosdoctor
0
69
Integrating Containers Into JavaScript
khaosdoctor
0
86
Entendendo o ecossistema de containers
khaosdoctor
1
1.1k
Other Decks in Technology
See All in Technology
組織にどうSREを根付かせるか?〜IVRyの場合〜
abnoumaru
0
330
Master Dataグループ紹介資料
sansan33
PRO
1
4.8k
【CEDEC2026】コードレビュー支援ツール開発から学ぶ:LLMを用いた業務システムの実践的な運用設計と誤出力対策
cygames
PRO
0
630
【CEDEC2026】グラフィックスエンジニアのためのニューラルシェーディング入門
cygames
PRO
0
130
Eight Engineering Unit 紹介資料
sansan33
PRO
3
8.1k
名刺メーカーDevグループ 紹介資料
sansan33
PRO
0
1.2k
AI時代の強いチームの作り方
yuukiyo
26
16k
今こそ聞きたいソフトウェア設計 ドメイン駆動設計再入門
masuda220
PRO
17
6.9k
TypeScript入門 2026
recruitengineers
PRO
3
500
[ChatGPT Work LT]事務作業が苦手な人のための バックオフィスの「半」自動化
chimaki_iot
0
250
オートロックマンションなのに、各部屋は施錠なし!? 攻撃者が組織内ネットワークで大暴れする理由 / The Front Door Is Locked, but the Rooms Are Wide Open: Why Attackers Move Freely Inside Enterprise Networks
nttcom
1
1.6k
【5分でわかる】セーフィー エンジニア向け会社紹介
safie_recruit
0
53k
Featured
See All Featured
AI: The stuff that nobody shows you
jnunemaker
PRO
9
890
Darren the Foodie - Storyboard
khoart
PRO
3
3.6k
Build your cross-platform service in a week with App Engine
jlugia
234
19k
From Legacy to Launchpad: Building Startup-Ready Communities
dugsong
0
290
Exploring the relationship between traditional SERPs and Gen AI search
raygrieselhuber
PRO
2
4.2k
Conquering PDFs: document understanding beyond plain text
inesmontani
PRO
4
2.9k
4 Signs Your Business is Dying
shpigford
187
22k
Leo the Paperboy
mayatellez
8
2.1k
The Power of CSS Pseudo Elements
geoffreycrofte
82
6.5k
Statistics for Hackers
jakevdp
799
230k
Heart Work Chapter 1 - Part 1
lfama
PRO
8
36k
Designing for Timeless Needs
cassininazir
1
430
Transcript
Javascript as you never saw before
cloud advocate_ who am I_
[email protected]
{twitter, facebook, linkedin…}.lsantos.dev
The magic JS
Removing Callbacks
The Dark Side of Javascript JS
Symbols
None
None
None
BUT BE AWARE_
Small usage example
Other usage example in Node.js source code bit.ly/nodejs-symbol Check it
out!
Async Iterators_
None
None
None
None
None
None
None
Promise.finally
None
Promise.allSettled
None
None
Ranges
None
None
None
Readonly properties_
Object.defineProperty
None
Object.defineProperties
‘age’ hasn’t been shown because it’s not enumerable
Private class fields_
None
None
Dynamic function creation_
None
None
in operator_
None
None
Dynamic instances by reflection_
None
None
None
Bitwise Operators_
AND
None
What!?
A B C D Result X 0 1 0 1
5 Y 0 0 0 1 1 Z 0 0 0 1 1
String as binary data
OR
None
A B C D Result X 0 1 0 1
5 Y 0 0 0 1 1 Z 0 1 0 1 5
XOR
None
A B C D Result X 0 1 0 1
5 Y 0 0 0 1 1 Z 0 1 0 0 4
Cryptography
None
NOT
None
A B C D Resultado X 0 1 0 1
5 Z 1 0 1 0 10
Existence condition
None
SHIFT
None
Multiply and divide
None
refs_ - imasters.com.br/desenvolvimento/o-lado-escuro-javascript - medium.com/trainingcenter/entendendo-promises-de-uma-vez-por-todas-3 2442ec725c2 - imasters.com.br/desenvolvimento/campos-publicos-e-privados-em-classes-j avascript-o-que-vem-por-ai-no-esnext -
imasters.com.br/javascript/futuro-das-promises-no-javascript - medium.com/trainingcenter/iterators-em-javascript-880adef14495 - medium.com/trainingcenter/reflection-em-javascript-73fc0e702e2 - developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objec ts/Reflect - slides.lsantos.dev/desmistificando-heranca-e-prototipos-no-javascript - dev.to/khaosdoctor/entendendo-async-iterators-1opo
thank you_ info.lsantos.dev