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6 Copying objects and Arrays

 来源:Axel 浏览 531 扫码 分享 2020-06-08 21:57:09
  • 6 Copying objects and Arrays

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    6 Copying objects and Arrays

    In this chapter, we will learn how to copy objects and Arrays in JavaScript.

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    • I Frontmatter
      • 1 About this book
        • 1.1 Where is the homepage of this book?
        • 1.2 What is in this book?
        • 1.3 What do I get for my money?
        • 1.4 How can I preview the content?
        • 1.5 How do I report errors?
        • 1.6 Tips for reading
        • 1.7 Notations and conventions
        • 1.8 Acknowledgements
    • II Types, values, variables
      • 2 Type coercion in JavaScript
        • 2.1 What is type coercion?
        • 2.2 Operations that help implement coercion in the ECMAScript specification
        • 2.3 Intermission: expressing specification algorithms in JavaScript
        • 2.4 Example coercion algorithms
        • 2.5 Operations that coerce
        • 2.6 Glossary: terms related to type conversion
      • 3 The destructuring algorithm
        • 3.1 Preparing for the pattern matching algorithm
        • 3.2 The pattern matching algorithm
        • 3.3 Empty object patterns and Array patterns
        • 3.4 Applying the algorithm
      • 4 A detailed look at global variables
        • 4.1 Scopes
        • 4.2 Lexical environments
        • 4.3 The global object
        • 4.4 In browsers, globalThis does not point directly to the global object
        • 4.5 The global environment
        • 4.6 Conclusion: Why does JavaScript have both normal global variables and the global object?
        • 4.7 Further reading and sources of this chapter
      • 5 % is a remainder operator, not a modulo operator
        • 5.1 Remainder operator rem vs. modulo operator mod
        • 5.2 An intuitive understanding of the remainder operation
        • 5.3 An intuitive understanding of the modulo operation
        • 5.4 Similarities and differences between rem and mod
        • 5.5 The equations behind remainder and modulo
        • 5.6 Where are rem and mod used in programming languages?
        • 5.7 Further reading and sources of this chapter
    • III Working with data
      • 6 Copying objects and Arrays
        • 6.1 Shallow copying vs. deep copying
        • 6.2 Shallow copying in JavaScript
        • 6.3 Deep copying in JavaScript
        • 6.4 Further reading
      • 7 Updating data destructively and non-destructively
        • 7.1 Examples: updating an object destructively and non-destructively
        • 7.2 Examples: updating an Array destructively and non-destructively
        • 7.3 Manual deep updating
        • 7.4 Implementing generic deep updating
      • 8 The problems of shared mutable state and how to avoid them
        • 8.1 What is shared mutable state and why is it problematic?
        • 8.2 Avoiding sharing by copying data
        • 8.3 Avoiding mutations by updating non-destructively
        • 8.4 Preventing mutations by making data immutable
        • 8.5 Libraries for avoiding shared mutable state
    • IV OOP: object property attributes
      • 9 Property attributes: an introduction
        • 9.1 The structure of objects
        • 9.2 Property descriptors
        • 9.3 Retrieving descriptors for properties
        • 9.4 Defining properties via descriptors
        • 9.5 Object.create(): Creating objects via descriptors
        • 9.6 Use cases for Object.getOwnPropertyDescriptors()
        • 9.7 Omitting descriptor properties
        • 9.8 What property attributes do built-in constructs use?
        • 9.9 API: property descriptors
        • 9.10 Further reading
      • 10 Where are the remaining chapters?
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