Understanding ECMAScript 6
Understanding ECMAScript 6
About the Book
What you'll learn:
- All of the changes to the language since ECMAScript 5
- Why iterators and generators are useful
- How arrow functions are differ from regular functions
- Additional options for storing data using sets, maps, and more
- The power of inheriting from native types
- Why people are so excited about promises for asynchronous programming
- How modules will change the way you organize code
- The Road to ECMAScript 6
- About This Book
- Var Declarations and Hoisting
- Block-Level Declarations
- Block Binding in Loops
- Global Block Bindings
- Emerging Best Practices for Block Bindings
Strings and Regular Expressions
- Better Unicode Support
- Other String Changes
- Other Regular Expression Changes
- Template Literals
- Functions with Default Parameter Values
- Working with Unnamed Parameters
- Increased Capabilities of the Function Constructor
- The Spread Operator
- ECMAScript 6’s name Property
- Clarifying the Dual Purpose of Functions
- Block-Level Functions
- Arrow Functions
- Tail Call Optimization
Expanded Object Functionality
- Object Categories
- Object Literal Syntax Extensions
- New Methods
- Duplicate Object Literal Properties
- Own Property Enumeration Order
- More Powerful Prototypes
- A Formal Method Definition
Destructuring for Easier Data Access
- Why is Destructuring Useful?
- Object Destructuring
- Array Destructuring
- Mixed Destructuring
- Destructured Parameters
Symbols and Symbol Properties
- Creating Symbols
- Using Symbols
- Sharing Symbols
- Symbol Coercion
- Retrieving Symbol Properties
- Exposing Internal Operations with Well-Known Symbols
Sets and Maps
- Sets and Maps in ECMAScript 5
- Problems with Workarounds
- Sets in ECMAScript 6
- Maps in ECMAScript 6
Iterators and Generators
- The Loop Problem
- What are Iterators?
- What Are Generators?
- Iterables and for-of
- Built-in Iterators
- The Spread Operator and Non-Array Iterables
- Advanced Iterator Functionality
- Asynchronous Task Running
- Class-Like Structures in ECMAScript 5
- Class Declarations
- Class Expressions
- Classes as First-Class Citizens
- Accessor Properties
- Computed Member Names
- Generator Methods
- Static Members
- Inheritance with Derived Classes
- Using new.target in Class Constructors
Improved Array Capabilities
- Creating Arrays
- New Methods on All Arrays
- Typed Arrays
- Similarities Between Typed and Regular Arrays
- Differences Between Typed and Regular Arrays
Promises and Asynchronous Programming
- Asynchronous Programming Background
- Promise Basics
- Global Promise Rejection Handling
- Chaining Promises
- Responding to Multiple Promises
- Inheriting from Promises
Proxies and the Reflection API
- The Array Problem
- What are Proxies and Reflection?
- Creating a Simple Proxy
Validating Properties Using the
Object Shape Validation Using the
Hiding Property Existence Using the
Preventing Property Deletion with the
- Prototype Proxy Traps
- Object Extensibility Traps
- Property Descriptor Traps
Function Proxies with the
- Revocable Proxies
- Solving the Array Problem
- Using a Proxy as a Prototype
Encapsulating Code With Modules
- What are Modules?
- Basic Exporting
- Basic Importing
- Renaming Exports and Imports
- Default Values in Modules
- Re-exporting a Binding
- Importing Without Bindings
- Loading Modules
Appendix A: Smaller Changes
- Working with Integers
- New Math Methods
- Unicode Identifiers
Appendix B: Understanding ECMAScript 7 (2016)
- The Exponentiation Operator
- The Array.prototype.includes() Method
- Change to Function-Scoped Strict Mode
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