High Performance JavaScript
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Book Description
Build Faster Web Application Interfaces
Product Description
If you're like most developers, you rely heavily on JavaScript to build interactive and quick-responding web applications. The problem is that all of those lines of JavaScript code can slow down your apps. This book reveals techniques and strategies to help you eliminate performance bottlenecks during development. You'll learn how to improve execution time, downloading, interaction with the DOM, page life cycle, and more.
Yahoo! frontend engineer Nicholas C. Zakas and five other JavaScript experts -- Ross Harmes, Julien Lecomte, Steven Levithan, Stoyan Stefanov, and Matt Sweeney -- demonstrate optimal ways to load code onto a page, and offer programming tips to help your JavaScript run as efficiently and quickly as possible. You'll learn the best practices to build and deploy your files to a production environment, and tools that can help you find problems once your site goes live.
- Identify problem code and use faster alternatives to accomplish the same task
- Improve scripts by learning how JavaScript stores and accesses data
- Implement JavaScript code so that it doesn't slow down interaction with the DOM
- Use optimization techniques to improve runtime performance
- Learn ways to ensure the UI is responsive at all times
- Achieve faster client-server communication
- Use a build system to minify files, and HTTP compression to deliver them to the browser
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3 of 4 people found the following review helpful
Format:Paperback
A short book at around 200 pages this book will give the reader a solid grounding in improving their Javascript, both in writing code and its integration with its environment. High performance Javascript isn't just about getting a program out of the door, given its interaction with elements of a web page - the DOM - and the network infrastructure, there is much more to consider.
The book builds on the basis of Steve Souders' book "High Performance Web Sites", indeed chapter one is an extension of several of the rules in that book. This book takes each aspect of the environment and shows its impact on code speed: Manipulating the DOM is time expensive so do this work away from the document then just add the resulting fragment back is one example. Each tip is backed up by figures showing the resultant speed benefits. Who would have thought that the "for ... in ..." loop was up to seven times slower than other looping constructs for example? The chapter on regular expressions is a particular eye-opener.
The book also takes in to account the differences between the various Javascript interpreters and the effects that optimisations have on each of them, some improvements in one browser may slow things down in another. Traditional programming optimisations are also covered and in this respect Javascript is little different to many other languages. The final two chapters are more concerned with factors outside the code, deployment and tools, and feel a little out of place, there is no need for the mass of screen shots in the tools chapter for instance.
I would have given this book a five but some of the code examples are annoyingly incomplete and these are not available on the supporting website. Still it is a book well worth having, highly recommended.
The book builds on the basis of Steve Souders' book "High Performance Web Sites", indeed chapter one is an extension of several of the rules in that book. This book takes each aspect of the environment and shows its impact on code speed: Manipulating the DOM is time expensive so do this work away from the document then just add the resulting fragment back is one example. Each tip is backed up by figures showing the resultant speed benefits. Who would have thought that the "for ... in ..." loop was up to seven times slower than other looping constructs for example? The chapter on regular expressions is a particular eye-opener.
The book also takes in to account the differences between the various Javascript interpreters and the effects that optimisations have on each of them, some improvements in one browser may slow things down in another. Traditional programming optimisations are also covered and in this respect Javascript is little different to many other languages. The final two chapters are more concerned with factors outside the code, deployment and tools, and feel a little out of place, there is no need for the mass of screen shots in the tools chapter for instance.
I would have given this book a five but some of the code examples are annoyingly incomplete and these are not available on the supporting website. Still it is a book well worth having, highly recommended.
Format:Paperback
The book is very interesting for an experienced javascript developer. Contains many tricks and techniques that can be used to improve the performance of your javascript. However, what I don't like about the book is that it encourage developers to do premature optimization. Would be good if it contained a section about when to do optimizations and when not to do it. E.g. Even faster websites by Steve Souders starts with a chapter about that. I thought the book was enjoying and interesting, but I would question the usefulness of e.g. optimizing loops.
2 of 3 people found the following review helpful
Format:Paperback
I read through this in a couple of days. It's excellent for intermediate to advanced developers. The logic is well explained in step by step detail. The example case studies provide enough for you to understand the logic without even having to test it yourself. This is the kind of book that I like to read through.
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