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    Beautiful Code
    Dedication
    Foreword
    Preface
    Ch. 1. A Regular Expression Matcher
    Ch. 2. Subversion's Delta Editor: Interface As Ontology
    Ch. 3. The Most Beautiful Code I Never Wrote
    Ch. 4. Finding Things
    Ch. 5. Correct, Beautiful, Fast (in That Order): Lessons from Designing XML Verifiers
    Ch. 6. Framework for Integrated Test: Beauty Through Fragility
    Ch. 7. Beautiful Tests
    Ch. 8. On-the-Fly Code Generation for Image Processing
    Ch. 9. Top Down Operator Precedence
    JavaScript
    Symbol Table
    Tokens
    Precedence
    Expressions
    Infix Operators
    Prefix Operators
    Assignment Operators
    Constants
    Scope
    Statements
    Functions
    Array and Object Literals
    Things to Do and Think About
    Ch. 10. The Quest for an Accelerated Population Count
    Ch. 11. Secure Communication: The Technology Of Freedom
    Ch. 12. Growing Beautiful Code in BioPerl
    Ch. 13. The Design of the Gene Sorte
    Ch. 14. How Elegant Code Evolves with Hardware The Case of Gaussian Elimination
    Ch. 15. The Long-Term Benefits of Beautiful Design
    Ch. 16. The Linux Kernel Driver Model: The Benefits of Working Together
    Ch. 17. Another Level of Indirection
    Ch. 18. Python's Dictionary Implementation: Being All Things to All People
    Ch. 19. Multidimensional Iterators in NumPy
    Ch. 20. A Highly Reliable Enterprise System for NASA's Mars Rover Mission
    Ch. 21. ERP5: Designing for Maximum Adaptability
    Ch. 22. A Spoonful of Sewage
    Ch. 23. Distributed Programming with MapReduce
    Ch. 24. Beautiful Concurrency
    Ch. 25. Syntactic Abstraction: The syntax-case Expander
    Ch. 26. Labor-Saving Architecture: An Object-Oriented Framework for Networked Software
    Ch. 27. Integrating Business Partners the RESTful Way
    Ch. 28. Beautiful Debugging
    Ch. 29. Treating Code As an Essay
    Ch. 30. When a Button Is All That Connects You to the World
    Ch. 31. Emacspeak: The Complete Audio Desktop
    Ch. 32. Code in Motion
    Ch. 33. Writing Programs for "The Book"
    Appx. A. Afterword
    Appx. B. Contributors
    Colophon
    Index
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    9.3. Tokens

    We assume that the source text has been transformed into an array of simple token objects (tokens), each containing a type member that is a string ("name", "string", "number", "operator") and a value member that is a string or number.

    The token variable always contains the current token:


      

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