You Don't Know JS Yet: The Unbooks
You Don't Know JS Yet: The Unbooks
Previously Unpublished 2nd-Ed Book Content (Raw & Uncut)
About the Book
You Don’t Know JS Yet: The Unbooks is a special, draft-edition release collecting the final remaining content from the second edition of the You Don’t Know JS Yet series. It includes the complete, previously unpublished drafts of Book 3: Objects & Classes and Book 4: Types & Grammar—books that were written in full but never formally edited or released for publication.
These chapters reflect the same in-depth exploration and care you’ve come to expect from the series, just presented here in their raw, unedited, unpolished form. They’re readable, structurally complete, and technically solid—offered honestly as-is.
This release also includes two bonus chapters on the “lost” volumes that were never written: Book 5: Sync & Async and Book 6: ES.Next & Beyond. These reflective essays explain what those books were meant to be, why they were ultimately abandoned, and what insights remain worth sharing. This is a project for the completists, the curious, and anyone who still cares deeply about understanding JavaScript, not just using it.
About the Author
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Table of Contents
-
- Preface
-
Objects & Classes (Unbook 3)
-
Chapter 1: Object Foundations (Objects & Classes)
- About This Book
- Objects As Containers
- Defining Properties
- Accessing Properties
- Assigning Properties
- Deleting Properties
- Determining Container Contents
- Temporary Containers
- Containers Are Collections Of Properties
-
Chapter 2: How Objects Work (Objects & Classes)
- Property Descriptors
- Object Sub-Types
- Object Characteristics
- Extending The MOP
-
[[Prototype]]Chain - Objects Behavior
-
Chapter 3: Classy Objects (Objects & Classes)
- When Should I Class-Orient My Code?
-
Keep It
classy -
Class Instance
this - Class Extension
- Static Class Behavior
- Private Class Behavior
- Class Example
-
Chapter 4: This Works (Objects & Classes)
- This Aware
- This Is It!
- An Arrow Points Somewhere
- Variations
- Stay Aware
-
Chapter 5: Delegation (Objects & Classes)
- Preamble
- What’s A Constructor, Anyway?
- Ditching Class Thinking
- Delegation Illustrated
- Composing Peer Objects
- Why This?
-
Chapter 1: Object Foundations (Objects & Classes)
-
Types & Grammar (Unbook 4)
-
Chapter 1: Primitive Values (Types & Grammar)
- Value Types
- Empty Values
- Boolean Values
- String Values
- Number Values
- BigInteger Values
- Symbol Values
- Primitives Are Built-In Types
-
Chapter 2: Primitive Behaviors (Types & Grammar)
- Primitive Immutability
- Primitive Assignments
- String Behaviors
- Number Behaviors
- Primitives Are Foundational
-
Chapter 3: Object Values (Types & Grammar)
- Types of Objects
- Plain Objects
- Fundamental Objects
- Other Built-in Objects
- Arrays
- Regular Expressions
- Functions
- Proposed: Records/Tuples
-
Chapter 4: Coercing Values (Types & Grammar)
- Coercion: Explicit vs Implicit
- Abstracts
- Concrete Coercions
- Coercion Corner Cases
- Type Awareness
- What’s Left?
-
Chapter 1: Primitive Values (Types & Grammar)
-
Sync & Async (Unbook 5)
-
Chapter 1: Lost Book (Sync & Async)
- The Plan
- The Reality
- That said…
-
Chapter 2: Random Musings (Sync & Async)
- Synchronous Iteration
- Asynchronous Iteration
-
Chapter 1: Lost Book (Sync & Async)
-
ES.Next & Beyond (Unbook 6)
-
Chapter 1: Lost Book (ES.Next & Beyond)
- However…
-
Chapter 2: The Bright Parts (ES.Next & Beyond)
- Nullish
- Synchronous Iteration Helpers
- Readable Numbers
- Named Regex Capture Groups
- Promise Expansions
-
Chapter 1: Lost Book (ES.Next & Beyond)
- Second Edition Thank Yous
- Notes
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