You Don't Know JS Yet: Scope & Closures [2 ed.] 9781647862213
The worldwide best selling You Don't Know JS book series is back for a 2nd edition: You Don't Know JS Yet. All
1,646 119 1MB
English Pages 270 Year 2020
Table of contents :
Table of Contents
Foreword
Preface
The Parts
The Title?
The Mission
The Path
Chapter 1: What's the Scope?
About This Book
Compiled vs. Interpreted
Compiling Code
Compiler Speak
Cheating: Runtime Scope Modifications
Lexical Scope
Chapter 2: Illustrating Lexical Scope
Marbles, and Buckets, and Bubbles… Oh My!
A Conversation Among Friends
Nested Scope
Continue the Conversation
Chapter 3: The Scope Chain
``Lookup'' Is (Mostly) Conceptual
Shadowing
Function Name Scope
Arrow Functions
Backing Out
Chapter 4: Around the Global Scope
Why Global Scope?
Where Exactly is this Global Scope?
Global This
Globally Aware
Chapter 5: The (Not So) Secret Lifecycle of Variables
When Can I Use a Variable?
Hoisting: Yet Another Metaphor
Re-declaration?
Uninitialized Variables (aka, TDZ)
Finally Initialized
Chapter 6: Limiting Scope Exposure
Least Exposure
Hiding in Plain (Function) Scope
Scoping with Blocks
Function Declarations in Blocks (FiB)
Blocked Over
Chapter 7: Using Closures
See the Closure
The Closure Lifecycle and Garbage Collection (GC)
An Alternative Perspective
Why Closure?
Closer to Closure
Chapter 8: The Module Pattern
Encapsulation and Least Exposure (POLE)
What Is a Module?
Node CommonJS Modules
Modern ES Modules (ESM)
Exit Scope
Appendix A: Exploring Further
Implied Scopes
Anonymous vs. Named Functions
Hoisting: Functions and Variables
The Case for var
What's the Deal with TDZ?
Are Synchronous Callbacks Still Closures?
Classic Module Variations
Appendix B: Practice
Buckets of Marbles
Closure (PART 1)
Closure (PART 2)
Closure (PART 3)
Modules
Suggested Solutions
Table of Contents
Foreword
Preface
The Parts
The Title?
The Mission
The Path
Chapter 1: What's the Scope?
About This Book
Compiled vs. Interpreted
Compiling Code
Compiler Speak
Cheating: Runtime Scope Modifications
Lexical Scope
Chapter 2: Illustrating Lexical Scope
Marbles, and Buckets, and Bubbles… Oh My!
A Conversation Among Friends
Nested Scope
Continue the Conversation
Chapter 3: The Scope Chain
``Lookup'' Is (Mostly) Conceptual
Shadowing
Function Name Scope
Arrow Functions
Backing Out
Chapter 4: Around the Global Scope
Why Global Scope?
Where Exactly is this Global Scope?
Global This
Globally Aware
Chapter 5: The (Not So) Secret Lifecycle of Variables
When Can I Use a Variable?
Hoisting: Yet Another Metaphor
Re-declaration?
Uninitialized Variables (aka, TDZ)
Finally Initialized
Chapter 6: Limiting Scope Exposure
Least Exposure
Hiding in Plain (Function) Scope
Scoping with Blocks
Function Declarations in Blocks (FiB)
Blocked Over
Chapter 7: Using Closures
See the Closure
The Closure Lifecycle and Garbage Collection (GC)
An Alternative Perspective
Why Closure?
Closer to Closure
Chapter 8: The Module Pattern
Encapsulation and Least Exposure (POLE)
What Is a Module?
Node CommonJS Modules
Modern ES Modules (ESM)
Exit Scope
Appendix A: Exploring Further
Implied Scopes
Anonymous vs. Named Functions
Hoisting: Functions and Variables
The Case for var
What's the Deal with TDZ?
Are Synchronous Callbacks Still Closures?
Classic Module Variations
Appendix B: Practice
Buckets of Marbles
Closure (PART 1)
Closure (PART 2)
Closure (PART 3)
Modules
Suggested Solutions
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