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You Don't Know JS: Scope & Closures

✍ Scribed by Kyle Simpson

Publisher
O'Reilly Media
Year
2014
Tongue
English
Leaves
98
Series
You Don't Know JS
Edition
1
Category
Library
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✦ Synopsis

No matter how much experience you have with javascript, odds are you don’t fully understand the language. This concise yet in-depth guide takes you inside scope and closures, two core concepts you need to know to become a more efficient and effective javascript programmer. You’ll learn how and why they work, and how an understanding of closures can be a powerful part of your development skillset.

✦ Table of Contents

Foreword v
Preface vii
1. What Is Scope? 1
Compiler Theory 1
Understanding Scope 3
Nested Scope 8
Errors 10
Review 11
2. Lexical Scope 13
Lex-time 13
Cheating Lexical 16
Review 21
3. Function Versus Block Scope 23
Scope From Functions 23
Hiding in Plain Scope 24
Functions as Scopes 28
Blocks as Scopes 33
Review 39
4. Hoisting 41
Chicken or the Egg? 41
The Compiler Strikes Again 42
Functions First 44
5. Scope Closure 47
Enlightenment 47
Nitty Gritty 48
Now I Can See 51
Loops and Closure 53
Modules 56
Review 63
A. Dynamic Scope 65
B. Polyfilling Block Scope 69
C. Lexical this75
D. Acknowledgments 79

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