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You're reading from  Professional JavaScript for Web Developers - Fourth Edition

Product typeBook
Published inNov 2019
Reading LevelBeginner
PublisherWiley
ISBN-139781119366447
Edition4th Edition
Languages
JavaScript
Concepts
Web Programming
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Author (1)
Matt Frisbie
Matt Frisbie
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Matt Frisbie

Matt Frisbie has worked in web development for over a decade. During that time, he's been a startup co-founder, an engineer at a Big Four tech company, and the first engineer at a Y Combinator startup that would eventually become a billion-dollar company. As a Google software engineer, Matt worked on both the AdSense and Accelerated Mobile Pages (AMP) platforms; his code contributions run on most of the planet's web browsing devices. Prior to this, Matt was the first engineer at DoorDash, where he helped lay the foundation for a company that has become the leader in online food delivery. Matt has written two books and recorded two video series for O'Reilly and Packt, speaks at frontend meetups and web casts, and is a level 1 sommelier. He majored in Computer Engineering at the University of Illinois Urbana-Champaign. Matt's Twitter handle is @mattfriz.
Read more about Matt Frisbie

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ASYNCHRONOUS ITERATION

Asynchronous execution and the iterator protocol are two extremely pervasive themes in new ECMAScript features over recent releases. Asynchronous execution involves releasing control of the execution thread to allow slow operations to finish before regaining control, and the iterator protocol involves defining a canonical ordering for arbitrary objects. Asynchronous iteration is merely the logical assimilation of these two concepts.

A synchronous iterator provides you with a { value, done } pair each time next() is invoked. Of course, this requires that the computation and resource fetching needed to determine the contents of this pair be completed by the time the next() invocation exits—otherwise, these values are indeterminate. When using a synchronous iterator to iterate over values that are determined asynchronously, the main execution thread will be blocked while waiting for the asynchronous operation to complete.

With asynchronous iterators, this problem...

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Professional JavaScript for Web Developers - Fourth Edition
Published in: Nov 2019Publisher: WileyISBN-13: 9781119366447
© 2019 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Matt Frisbie

Matt Frisbie has worked in web development for over a decade. During that time, he's been a startup co-founder, an engineer at a Big Four tech company, and the first engineer at a Y Combinator startup that would eventually become a billion-dollar company. As a Google software engineer, Matt worked on both the AdSense and Accelerated Mobile Pages (AMP) platforms; his code contributions run on most of the planet's web browsing devices. Prior to this, Matt was the first engineer at DoorDash, where he helped lay the foundation for a company that has become the leader in online food delivery. Matt has written two books and recorded two video series for O'Reilly and Packt, speaks at frontend meetups and web casts, and is a level 1 sommelier. He majored in Computer Engineering at the University of Illinois Urbana-Champaign. Matt's Twitter handle is @mattfriz.
Read more about Matt Frisbie

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