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
Your Code Sucks: Best Practices for Enterprise ...
Search
Arthur Kay
August 15, 2012
Programming
8
2.6k
Your Code Sucks: Best Practices for Enterprise JavaScript Development
From ThatConference 2012
Arthur Kay
August 15, 2012
Tweet
Share
More Decks by Arthur Kay
See All by Arthur Kay
Analyzing the ROI of JavaScript in Enterprise Software Development
arthurakay
0
150
Debugging your Apps with Google Chrome and Sencha
arthurakay
1
260
Announcing Ext JS 5
arthurakay
0
130
Conquering the Command Line
arthurakay
0
300
The Future of Enterprise App Development
arthurakay
0
130
Best Practices for Enterprise JavaScript Applications
arthurakay
7
2.5k
Bringing the Mobile Web to the Cloud
arthurakay
2
550
Building Native Windows 8 Apps with Sencha
arthurakay
0
250
Creating Windows 8 Apps with Ext JS
arthurakay
1
280
Other Decks in Programming
See All in Programming
設計やレビューに悩んでいるPHPerに贈る、クリーンなオブジェクト設計の指針たち
panda_program
6
2k
おやつのお供はお決まりですか?@WWDC25 Recap -Japan-\(region).swift
shingangan
0
120
なんとなくわかった気になるブロックテーマ入門/contents.nagoya 2025 6.28
chiilog
1
270
「テストは愚直&&網羅的に書くほどよい」という誤解 / Test Smarter, Not Harder
munetoshi
0
150
AIプログラマーDevinは PHPerの夢を見るか?
shinyasaita
1
210
Railsアプリケーションと パフォーマンスチューニング ー 秒間5万リクエストの モバイルオーダーシステムを支える事例 ー Rubyセミナー 大阪
falcon8823
5
1.1k
#QiitaBash MCPのセキュリティ
ryosukedtomita
1
990
Composerが「依存解決」のためにどんな工夫をしているか #phpcon
o0h
PRO
1
250
AI時代のソフトウェア開発を考える(2025/07版) / Agentic Software Engineering Findy 2025-07 Edition
twada
PRO
76
25k
なぜ「共通化」を考え、失敗を繰り返すのか
rinchoku
1
640
GitHub Copilot and GitHub Codespaces Hands-on
ymd65536
2
150
データの民主化を支える、透明性のあるデータ利活用への挑戦 2025-06-25 Database Engineering Meetup#7
y_ken
0
350
Featured
See All Featured
実際に使うSQLの書き方 徹底解説 / pgcon21j-tutorial
soudai
PRO
181
53k
Agile that works and the tools we love
rasmusluckow
329
21k
The Cost Of JavaScript in 2023
addyosmani
51
8.5k
Code Review Best Practice
trishagee
69
18k
Build The Right Thing And Hit Your Dates
maggiecrowley
36
2.8k
Designing Dashboards & Data Visualisations in Web Apps
destraynor
231
53k
Become a Pro
speakerdeck
PRO
28
5.4k
Designing for Performance
lara
610
69k
Performance Is Good for Brains [We Love Speed 2024]
tammyeverts
10
950
Thoughts on Productivity
jonyablonski
69
4.7k
Put a Button on it: Removing Barriers to Going Fast.
kastner
60
3.9k
How to Think Like a Performance Engineer
csswizardry
24
1.7k
Transcript
Best Practices for Enterprise JavaScript Applications YOUR CODE SUCKS
WHO AM I? • Arthur Kay • Solutions Engineer @
Sencha, Inc. • Web Development ~15 years • www.akawebdesign.com • @arthurakay
AGENDA • Improving application performance • Increasing code stability •
Scaling applications for enterprise • Tools • Advice
None
IMPROVING APPLICATION PERFORMANCE Part 1
CACHING
THIS CODE SUCKS
DO THIS INSTEAD • Cache values (references) • Avoid using
document.getElementById() and other global queries
DO THIS INSTEAD
OVER NESTING
THIS CODE SUCKS
DO THIS INSTEAD • Use lightweight containers (reduce DOM) •
Lazy Rendering
DO THIS INSTEAD
MEMORY LEAKS
THIS CODE SUCKS
DO THIS INSTEAD
INCREASING CODE STABILITY Part 2
SYNTAX ERRORS
THIS CODE SUCKS
DO THIS INSTEAD • Use JSLint (or something else) •
AUTOMATE SYNTAX CHECKING
ONE CLASS PER FILE
THIS CODE SUCKS
DO THIS INSTEAD • Organize your file system • Files
and folders should match namespacing • MVC (or something) • Development loader / Production builder
NAMES HAVE MEANING
THIS CODE SUCKS
DO THIS INSTEAD • Descriptive names on everything (except iterators)
• Common naming conventions (camelCase vs TitleCase vs nocase) • Exceptions for • constants ( SOME_CONSTANT ) • constructors ( MyClass ) • sub-namespaces ( Foo.bar.Class )_
COMMENTS / DOCUMENTATION
THIS CODE SUCKS
DO THIS INSTEAD • Comment top-level structures • Add notes
whenever logic is not obvious • Build your docs into a searchable tool
SCALING APPLICATIONS FOR ENTERPRISE Part 3
AVOID DUPLICATION
THIS CODE SUCKS
DO THIS INSTEAD • Abstraction! • Use mixins when possible
• Apply stuff to prototypes • Have similar classes/methods? • call() and apply()
DO THIS INSTEAD
SMALLER FILES. WHITE SPACE.
THIS CODE SUCKS
DO THIS INSTEAD • Keep methods under 50 lines •
Keep files under 500 lines • Use as much whitespace as possible.
UNIT TESTS
THIS CODE SUCKS
DO THIS INSTEAD • Write “testable” code • Focus on
important / trouble areas • AUTOMATE UNIT TESTING • Don’t insist on UI (integration/iteraction) tests * Test Driven JavaScript Development by Christian Johansen
TOOLS Stuff You Should Know About
IDE
INSPECT ELEMENT
YSLOW
JS DUCK
PHANTOM.JS
ADVICE Things I’ve Learned
SPECIFICATION – NOT TDD
NEVER STOP LEARNING
BREAK (SOME) RULES
None
ADDITIONAL RESOURCES • “Maintainable JavaScript” by Nicholas Zakas • http://www.slideshare.net/nzakas/maintainable-javascript-2012
• “Code Conventions for JS” by Douglass Crockford • http://javascript.crockford.com/code.html • “JavaScript Performance Tips & Tricks” by Grgur Grisogono • http://moduscreate.com/javascript-performance-tips-tricks/
THANKS! Arthur Kay | @arthurakay
SPEAKERDECK.COM/U/ARTHURAKAY Share this presentation: