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Refactoring JavaScript
Evan Burchard
Turning Bad Code into Good Code
Refactoring JavaScript
by Evan Burchard
Copyright © 2017 Evan Burchard. All rights reserved.
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• March 2017: First Edition
Revision History for the First Edition
• 2017-03-10: First Release
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JavaScript,
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While the publisher and the author have used good faith efforts to ensure that
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lisher and the author disclaim all responsibility for errors or omissions, includ-
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liance on this work. Use of the information and instructions contained in this
work is at your own risk. If any code samples or other technology this work con-
tains or describes is subject to open source licenses or the intellectual property
rights of others, it is your responsibility to ensure that your use thereof com-
plies with such licenses and/or rights.
978-1-491-96492-7
[LSI]
For Jade, again and always.
Table of Contents
Foreword
Preface
CHAPTER 1:
What Is Refactoring?
How Can You Guarantee Behavior Doesn’t Change?
Why Don’t We Care About Details of Implementation?
Why Don’t We Care About Unspecified and Untested Behavior?
Why Don’t We Care About Performance?
What Is the Point of Refactoring if Behavior Doesn’t Change?
Balancing Quality and Getting Things Done
What Is Quality and How Does It Relate to Refactoring?
Refactoring as Exploration
What Is and Isn’t Refactoring
Wrapping Up
CHAPTER 2:
Which JavaScript Are You Using?
Versions and Specifications
Platforms and Implementations
Precompiled Languages
Frameworks
Libraries
What JavaScript Do You Need?
What JavaScript Are We Using?
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