Secrets of the JavaScript Ninja is a practical, intermediate-level guide to modern JavaScript development. Organized around design, construction, and maintenance, it explains core language mechanics and shows how to think about applications and libraries from the right perspective.

Chapters focus on essential topics such as functions, objects and prototypes, closures, regular expressions, timers, and event handling. The book also covers DOM manipulation, CSS selector engines, runtime evaluation techniques, and strategies for dealing with browser differences.

Emphasis is placed on building robust, reusable code: testing and debugging practices, cross-browser strategies, and design patterns that make it easier to write and maintain libraries or frameworks. Ideal for developers who already know the basics and want deeper, practical insight into producing cleaner, more adaptable JavaScript.

Key topics

• Core language features: functions, closures, prototypes
• DOM, events, and CSS selector techniques
• Cross-browser development and debugging
• Designing and building reusable libraries

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