28Best Practices


  • Writing maintainable code
  • Ensuring code performance
  • Deploying code to production


Please note that all the code examples for this chapter are available as a part of this chapter's code download on the book's website at www.wrox.com/go/projavascript4e on the Download Code tab.

The discipline of web development has grown at an extraordinary rate since 2000. What used to be a virtual Wild West, where just about anything was acceptable, has evolved into a complete discipline with research and established best practices. As simple websites grew into more complex web applications, and web hobbyists became paid professionals, the world of web development was filled with information about the latest techniques and development approaches. JavaScript, in particular, was the beneficiary of a lot of research and conjecture. Best practices for JavaScript fall into several categories and are handled at different points in the development process.


In early websites, JavaScript was used primarily for small effects or form validation. Today's web applications are filled with thousands of lines of JavaScript executing all types of complicated processes. This evolution requires that developers take maintainability into account. As with software engineers in more traditional disciplines, JavaScript developers are hired to create value for their company, and they do that not just by delivering products ...

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