Exploring ES2016 and ES2017
Exploring ES2016 and ES2017
About the Book
- Complete contents of this book: http://exploringjs.com/es2016-es2017/
- Homepage with various resources: http://exploringjs.com/es2016-es2017.html
About the Author
Bundles that include this book
Table of Contents
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What you need to know about this book
- Support
- About the author
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What you need to know about this book
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I Background
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1. The TC39 process for ECMAScript features
- 1.1 Who designs ECMAScript?
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1.2 How is ECMAScript designed?
- 1.2.1 Problem: ECMAScript 2015 (ES6) was too large a release
- 1.2.2 Solution: the TC39 process
- 1.3 Don’t call them ECMAScript 20xx features
- 1.4 Further reading
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2. FAQ: ES2016 and ES2017
- 2.1 Isn’t ECMAScript 2016 too small?
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1. The TC39 process for ECMAScript features
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II ECMAScript 2016
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3.
Array.prototype.includes- 3.1 Overview
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3.2 The Array method
includes - 3.3 Frequently asked questions
- 3.4 Further reading
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4. Exponentiation operator (
**)- 4.1 Overview
- 4.2 An infix operator for exponentiation
- 4.3 Examples
- 4.4 Precedence
- 4.5 Further reading
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3.
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III ECMAScript 2017
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5. Async functions
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5.1 Overview
- 5.1.1 Variants
- 5.1.2 Async functions always return Promises
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5.1.3 Handling results and errors of asynchronous computations via
await
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5.2 Understanding async functions
- 5.2.1 Writing asynchronous code via generators
- 5.2.2 Writing asynchronous code via async functions
- 5.2.3 Async functions are started synchronously, settled asynchronously
- 5.2.4 Returned Promises are not wrapped
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5.3 Tips for using
await-
5.3.1 Don’t forget
await -
5.3.2 You don’t need
awaitif you “fire and forget” -
5.3.3
awaitis sequential,Promise.all()is parallel
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5.3.1 Don’t forget
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5.4 Async functions and callbacks
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5.4.1
Array.prototype.map() -
5.4.2
Array.prototype.forEach()
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5.4.1
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5.5 Tips for using async functions
- 5.5.1 Know your Promises
- 5.5.2 Immediately Invoked Async Function Expressions
- 5.5.3 Unit testing with async functions
- 5.5.4 Don’t worry about unhandled rejections
- 5.6 Further reading
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5.1 Overview
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6. Shared memory and atomics
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6.1 Parallelism vs. concurrency
- 6.1.1 Models of parallelism
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6.2 A history of JS parallelism
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6.2.1 The next step:
SharedArrayBuffer
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6.2.1 The next step:
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6.3 Shared Array Buffers
- 6.3.1 Creating and sending a Shared Array Buffer
- 6.3.2 Receiving a Shared Array Buffer
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6.4 Atomics: safely accessing shared data
- 6.4.1 Problem: Optimizations make code unpredictable across workers
- 6.4.2 Solution: atomics
- 6.4.3 Problem: torn values
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6.5 Shared Array Buffers in use
- 6.5.1 Shared Array Buffers and the run-to-completion semantics of JavaScript
- 6.5.2 Shared Array Buffers and asm.js and WebAssembly
- 6.5.3 Sharing data other than integers
- 6.5.4 How much faster is code that uses Shared Array Buffers?
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6.6 Example
- 6.6.1 Using a shared lock
- 6.6.2 Implementing a shared lock
- 6.6.3 Conclusion for the example
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6.7 The API for shared memory and atomics
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6.7.1
SharedArrayBuffer -
6.7.2
Atomics
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6.7.1
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6.8 FAQ
- 6.8.1 What browsers support Shared Array Buffers?
- 6.9 Further reading
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6.1 Parallelism vs. concurrency
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7.
Object.entries()andObject.values()-
7.1 Overview
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7.1.1
Object.entries() -
7.1.2
Object.values()
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7.1.1
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7.2
Object.entries()-
7.2.1 Setting up Maps via
Object.entries() -
7.2.2 FAQ:
Object.entries()
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7.2.1 Setting up Maps via
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7.3
Object.values()
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7.1 Overview
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8. New string methods:
padStartandpadEnd- 8.1 Overview
- 8.2 Why pad strings?
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8.3
String.prototype.padStart(maxLength, fillString=' ')-
8.3.1 A simple implementation of
padStart()
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8.3.1 A simple implementation of
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8.4
String.prototype.padEnd(maxLength, fillString=' ') -
8.5 FAQ:
padStartandpadEnd-
8.5.1 Why aren’t the padding methods called
padLeftandpadRight?
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8.5.1 Why aren’t the padding methods called
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9.
Object.getOwnPropertyDescriptors()- 9.1 Overview
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9.2
Object.getOwnPropertyDescriptors() -
9.3 Use cases for
Object.getOwnPropertyDescriptors()- 9.3.1 Use case: copying properties into an object
- 9.3.2 Use case: cloning objects
- 9.3.3 Use case: cross-platform object literals with arbitrary prototypes
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9.4 Pitfall: copying methods that use
super
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10. Trailing commas in function parameter lists and calls
- 10.1 Overview
- 10.2 Trailing commas in object literals and Array literals
- 10.3 Feature: allow trailing commas in parameter definitions and function calls
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5. Async functions
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