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Large Scale JavaScript Applications

Large Scale JavaScript Applications

Slides of my talk about large scale JS applications

Alexander Beletsky

May 12, 2012

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  1. Big Credits to: Addy Osmani Addy Osmani is a rebel

    JavaScript blogger, speaker and a UI Developer for AOL (yes, we're still around!). He is also a member of the jQuery [Bug Triage/Docs/Front-end] teams where he assists with bugs, documentation and developer evangelism. His recent open-source projects include TodoMVC, which helps developers compare JavaScript MVC frameworks. For more on Addy’s work, check out his official website AddyOsmani.com for tutorials and magazines such as .net for his thoughts and commentaries on the state of the web.
  2. Early JavaScript application • Mainly for web design • Copy/Paste

    pattern commonly used • Very poor browser support • Lack of “community” knowledge base • Low performace
  3. Modern JavaScript application • AJAX era started • Adoption and

    respect by masses • Huge improvement on standard and vendors • Performance boosted • New web assembly language • Expertice & Best practices
  4. “Modern web apps tend to be more (or equaly) complex

    on front end rather on back end”
  5. What is Large scale app? “In my view, large-scale JavaScript

    apps are non- trivial applications requiring significant developer effort to maintain, where most heavy lifting of data manipulation and display falls to the browser.” - Addy Osmani
  6. Namespace pattern “Namespacing is a technique employed to avoid collisions

    with other objects or variables in the global namespace” Goal: avoid names collision and provide facilities to organize blocks of functionality into easily managable groups
  7. Module pattern “The module pattern is a popular design that

    pattern that encapsulates 'privacy', state and organization using closures” Goal: It provides a way of wrapping a mix of public and private methods and variables, protecting pieces from leaking into the global scope and accidentally colliding with another developer's interface
  8. Facade pattern “ The facade pattern provides a convenient higher-level

    interface to a larger body of code, hiding its true underlying complexity. Think of it as simplifying the API being presented to other developers” Goal: to hide implementation-specific details about a body of functionality contained in individual modules. The implementation of a module can change without the clients really even knowing about it.
  9. Mediator pattern “ The mediator is a behavioral design pattern

    that allows us to expose a unified interface through which the different parts of a system may communicate” Goal: promotes loose coupling by ensuring that instead of components referring to each other explicitly, their interaction is handled through this central point. This can help us decouple systems and improve the potential for component reusability.
  10. Observer pattern “ The Observer is a design pattern which

    allows an object (known as a subscriber) to watch another object (the publisher), where we provide a means for the subscriber and publisher form a listen and broadcast relationship” Goal: the promotion of loose coupling. Rather than single objects calling on the methods of other objects directly, they instead subscribe to a specific task or activity of another object and are notified when it occurs.
  11. Proposed Architecture Module Facade Mediator RequireJS AMD • Loosely coupled

    • Broken into independent modules • Flexible (framework agnostic)
  12. Further reading: • Learning JavaScript Design Patterns http://addyosmani.com/resources/essentialjsdesignpatterns/book/ • Patterns

    For Large-Scale JavaScript Application Architecture http://addyosmani.com/largescalejavascript • Writing Modular JavaScript With AMD, CommonJS & ES Harmony http://addyosmani.com/writing-modular-js/ • Scalable JavaScript Application Architecture http://www.youtube.com/watch?v=vXjVFPosQHw&feature=youtu.be