Cover of You don't know JS: Async & Performance

You don't know JS: Async & Performance

Kyle Simpson

This book focuses on the new asynchronous features in JavaScript, which are new and confusing to developers.

31 score
#46 overall

Score based on developer article recommendations — not sales data or reviews.

JavaScriptFrontendconcurrencyperformance
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🟢 Developer Verdict

A deep dive into JavaScript's asynchronous features and performance optimizations, clarifying common confusions and advanced patterns.

Read this if

  • You need to untangle complex asynchronous JavaScript patterns.
  • You want to master Promises, async/await, and event loop mechanics.
  • You aim to optimize the performance of your JavaScript applications.

Skip this for now if

  • You are a complete beginner to JavaScript programming.
  • You prefer practical, project-based coding exercises.
  • You need a broad overview of general JavaScript language features.
Developer signal: Overwhelming Consensus · 100% 8 analyzed mentions Deep TechnicalFoundational

🔄 Compare & Reading Path

📊 Why Developers Recommend

1.

It takes language understanding beyond the basics.

2.

Cited by 12 different developers, each bringing their own experience and perspective.

3.

Developers value this book for building durable technical understanding, going beyond surface-level patterns into the reasoning behind design decisions.

Top signals: Deep TechnicalFoundational

💬 What Developers Say

"Last but not least (in fact that's my favorite), it's a series of 6 books by Kyle Simpson, titled *You don't know JS*."

— kapantzak · Some of my favorite Javascript resources · Aug 7, 2019

"If you've never read Kyle Simpson's fantastic series, [You Don't know JS], I'd first encourage to stop reading this, go read _that_ , and then come back."

— paceaux · Kyle Simpson proved I STILL don't know JavaScript (arrays) · Dec 7, 2019

"All the above 3 books by Kyle Simpson are must read , word by word"

— deen_john · Resources to Master Javascript · Apr 16, 2018

Based on 8 developer article mentions

👤 Who Should Read This

Best for

  • Developers looking to grow their careers

Less ideal for

  • Readers looking only for quick interview patterns
  • Developers wanting immediate hands-on tutorials
Difficulty: Intermediate Style: Deep, Foundational

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Score Trend

Last 90 Days

Articles

0

vs prev 90d

+6

Unique authors

12

Total mentions

14

Source Platforms

DEV 14
📰 About this signal · 8 analyzed mentions · Mostly High confidence

Article Types

Book List 5
Tutorial With Reference 2
Personal Story 1

Confidence

High 5
Medium 3
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