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Exploring ES2018 and ES2019

Table of contents

• Background
  • About this book
    • This book isn’t finished, yet
    • Feedback and corrections
  • About the author
  • The TC39 process for ECMAScript features
    • Who designs ECMAScript?
    • How is ECMAScript designed?
    • Don’t call them ECMAScript 20xx features
    • Further reading
• ECMAScript 2018
  • Asynchronous iteration
    • Asynchronous iteration
    • for-await-of
    • Asynchronous generators
    • Examples
    • WHATWG Streams are async iterables
    • The specification of asynchronous iteration
    • Alternatives to async iteration
    • Further reading
  • Rest/Spread Properties
    • The rest operator (...) in object destructuring
    • The spread operator (...) in object literals
    • Common use cases for the object spread operator
    • Spreading objects versus Object.assign()
  • RegExp named capture groups
    • Numbered capture groups
    • Named capture groups
    • Backreferences
    • replace() and named capture groups
    • Named groups that don’t match
    • Implementations
    • Further reading
  • RegExp Unicode property escapes
    • Overview
    • Unicode character properties
    • Unicode property escapes for regular expressions
    • Examples
    • Trying it out
    • Further reading
  • RegExp lookbehind assertions
    • Lookahead assertions
    • Lookbehind assertions
    • Conclusions
    • Further reading
  • s (dotAll) flag for regular expressions
    • Overview
    • Limitations of the dot (.) in regular expressions
    • The proposal
    • FAQ
  • Promise.prototype.finally()
    • How does it work?
    • Use case
    • .finally() is similar to finally {} in synchronous code
    • Availability
    • Further reading
  • Template Literal Revision
    • Tag functions and escape sequences
    • Problem: some text is illegal after backslashes
    • Solution