LEARNING JAVASCRIPT - Trang 10

Calling Versus Referencing 104

Function Arguments 105

Do Arguments Make the Function? 107

Destructuring Arguments 108

Default Arguments 109

Functions as Properties of Objects 109

The this Keyword 110

Function Expressions and Anonymous Functions 112

Arrow Notation 113

call, apply, and bind 114

Conclusion 116

7.

Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Scope Versus Existence 118

Lexical Versus Dynamic Scoping 118

Global Scope 119

Block Scope 121

Variable Masking 121

Functions, Closures, and Lexical Scope 123

Immediately Invoked Function Expressions 124

Function Scope and Hoisting 125

Function Hoisting 127

The Temporal Dead Zone 127

Strict Mode 128

Conclusion 129

8.

Arrays and Array Processing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

A Review of Arrays 131

Array Content Manipulation 132

Adding or Removing Single Elements at the Beginning or End 133

Adding Multiple Elements at the End 133

Getting a Subarray 134

Adding or Removing Elements at Any Position 134

Cutting and Replacing Within an Array 134

Filling an Array with a Specific Value 135

Reversing and Sorting Arrays 135

Array Searching 136

The Fundamental Array Operations: map and filter 138

Array Magic: reduce 140

Array Methods and Deleted or Never-Defined Elements 143

String Joining 143

Conclusion 144

viii | Table of Contents

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