Modern JavaScript from the Beginning - Second Edition - Logical Assignment

The video tutorial covers assignment operators, focusing on OR, AND, and nullish coalescing operators. It explains how these operators work with falsy and truthy values, providing examples for each. The OR assignment operator is highlighted as particularly useful for setting default values when a variable is falsy. The AND assignment operator is less commonly used but assigns values when a variable is truthy. The nullish coalescing operator is used to assign values only when a variable is null or undefined, avoiding issues with other falsy values like zero or empty strings.

What is the primary function of the OR assignment operator?

• To assign a value if the variable is truthy

• To assign a value if the variable is falsy

• To assign a value if the variable is null

• To assign a value if the variable is undefined

Which of the following is a shorthand for checking if a variable is falsy and assigning a value?

• a &&= 10

• a = a && 10

• a ||= 10

• a = a ?? 10

What does the AND assignment operator do?

• Assigns a value if the variable is falsy

• Assigns a value if the variable is truthy

• Assigns a value if the variable is null

• Assigns a value if the variable is undefined

Which assignment operator is less commonly used according to the tutorial?

• Nullish coalescing operator

• Logical NOT operator

• AND assignment operator

• OR assignment operator

Which operator is used to assign a value only if the variable is null or undefined?

• Logical NOT operator

• Nullish coalescing operator

• AND assignment operator

• OR assignment operator

How does the nullish coalescing operator differ from the OR operator?

• It checks only for null or undefined values

• It checks for zero and empty strings

• It checks for truthy values

• It checks for falsy values

What will be the value of C if it is initially set to null and then assigned using the nullish coalescing operator with 20?

• 20

• undefined

• null

• 0