Cover of You Don't Know JS: this & Object Prototypes

You Don't Know JS: this & Object Prototypes

Kyle Simpson

No matter how much experience you have with JavaScript, odds are you don’t fully understand the language. This concise, in-depth guide takes you inside JavaScript’s this structure and object prototypes.

5 score
#491 overall

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

JavaScriptSoftware ArchitectureFrontenddesign-patternsperformance
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🟢 Developer Verdict

A concise, in-depth guide demystifies JavaScript's `this` keyword and object prototypes, revealing their inner workings.

Read this if

  • You need a deep, clear understanding of JavaScript's `this` keyword.
  • You want to grasp the underlying mechanics of JS object prototypes.
  • You are frustrated by JavaScript's more complex, often misunderstood features.

Skip this for now if

  • You are new to JavaScript and need an introductory language overview.
  • You seek hands-on coding exercises or project-based learning.
  • You prefer content on modern JS features like ES6 modules or async/await.
Developer signal: Overwhelming Consensus · 100% 2 analyzed mentions Deep TechnicalWell WrittenCareer Changing

📊 Why Developers Recommend

1.

It takes language understanding beyond the basics.

2.

It develops deeper mastery and more idiomatic usage of the language.

3.

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

Top signals: Deep TechnicalWell WrittenCareer Changing

💬 What Developers Say

"If you want learn more about the inner workings of the code patterns above, read Kyle Simpson's excellent book series called, You Don't Know JS (Yet)"

— f1lt3r · TypeScript?.. or JavaScript? · Jul 22, 2020

"I recommend checking out this series if you’ve been frustrated with JavaScript."

— realtoughcandy · You Don’t Know JavaScript Book Review (Kyle Simpson) · Dec 17, 2020

"While also understanding the tough stuff like closures and `this`."

— realtoughcandy · You Don’t Know JavaScript Book Review (Kyle Simpson) · Dec 17, 2020

👤 Who Should Read This

Best for

  • Senior engineers deepening their expertise
  • 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

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Recommended in 2 Articles

TypeScript?.. or JavaScript?
● DEVby f1lt3r· Jul 22, 2020
You Don’t Know JavaScript Book Review (Kyle Simpson)
● DEVby realtoughcandy· Dec 17, 2020

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📰 About this signal · 2 analyzed mentions · Mostly High confidence

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