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    Copyright
    Preface
    Ch. 1. Working with JavaScript Strings
    Ch. 2. Using Regular Expressions
    Ch. 3. Dates, Time, and Timers
    Ch. 4. Working with Numbers and Math
    Ch. 5. Working with Arrays and Loops
    Ch. 6. Building Reusability with JavaScript Functions
    Ch. 7. Handling Events
    Ch. 8. Browser Pieces
    Ch. 9. Form Elements and Validation
    Ch. 10. Debugging and Error Handling
    Ch. 11. Accessing Page Elements
    Ch. 12. Creating and Removing Elements and Attributes
    Ch. 13. Working with Web Page Spaces
    Ch. 14. Creating Interactive and Accessible Effects with JavaScript, CSS, and ARIA
    Ch. 15. Creating Media Rich and Interactive Applications
    Ch. 16. JavaScript Objects
    recipe 16.1. Introduction
    recipe 16.2. Defining a Basic JavaScript Object
    recipe 16.3. Keeping Object Members Private
    recipe 16.4. Expanding Objects with prototype
    recipe 16.5. Adding Getter/Setter to Objects
    recipe 16.6. Inheriting an Object’s Functionality
    recipe 16.7. Extending an Object by Defining a New Property
    recipe 16.8. Enumerating an Object’s Properties
    recipe 16.9. Preventing Object Extensibility
    recipe 16.10. Preventing Object Additions and Changes to Property Descriptors
    recipe 16.11. Preventing Any Changes to an Object
    recipe 16.12. One-Off Objects and Namespacing Your JavaScript
    recipe 16.13. Rediscovering “this” with Prototype.bind
    recipe 16.14. Chaining Your Object’s Methods
    Ch. 17. JavaScript Libraries
    Ch. 18. Communication
    Ch. 19. Working with Structured Data
    Ch. 20. Persistence
    Ch. 21. JavaScript Outside the Box
    Colophon
    Index
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    Chapter 16. JavaScript Objects > Preventing Object Extensibility

    recipe 16.9. Preventing Object Extensibility

    16.9.1. Problem

    You want to prevent others from extending an object.

    16.9.2. Solution

    Use the new ECMAScript 5 Object.preventExtensions method to lock an object against future property additions:


      

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