LEARNING JAVASCRIPT - Trang 9

Chaining if...else Statements 69

Metasyntax 69

Additional for Loop Patterns 71

switch Statements 72

for...in loop 75

for...of loop 75

Useful Control Flow Patterns 76

Using continue to Reduce Conditional Nesting 76

Using break or return to Avoid Unnecessary Computation 76

Using Value of Index After Loop Completion 77

Using Descending Indexes When Modifying Lists 77

Conclusion 78

5.

Expressions and Operators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Operators 81

Arithmetic Operators 81

Operator Precedence 84

Comparison Operators 85

Comparing Numbers 87

String Concatenation 88

Logical Operators 88

Truthy and Falsy Values 89

AND, OR, and NOT 89

Short-Circuit Evaluation 91

Logical Operators with Nonboolean Operands 91

Conditional Operator 92

Comma Operator 93

Grouping Operator 93

Bitwise Operators 93

typeof Operator 95

void Operator 96

Assignment Operators 96

Destructuring Assignment 98

Object and Array Operators 99

Expressions in Template Strings 100

Expressions and Control Flow Patterns 100

Converting if...else Statements to Conditional Expressions 100

Converting if Statements to Short-Circuited Logical OR Expressions 101

Conclusion 101

6.

Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

Return Values 104

Table of Contents | vii

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