Q
What is the result of the expression typeof undefined in JavaScript?

Answer & Solution

Answer: Option C
Solution:
The typeof operator in JavaScript returns 'undefined' when applied to the Undefined data type, indicating a variable that has been declared but not initialized.
Related Questions on Average

Which primitive data type represents variables that are declared but not initialized?

A). Number

B). String

C). Undefined

D). Null

Which primitive data type represents unique identifiers introduced in ECMAScript 6?

A). Number

B). Symbol

C). Boolean

D). Undefined

How is the Symbol data type different from other primitive data types in JavaScript?

A). Symbols can be used as object keys

B). Symbols can be compared directly

C). Symbols can be used in mathematical operations

D). Symbols can be concatenated with strings

What does the expression typeof null return in JavaScript?

A). number

B). string

C). object

D). boolean

What does the expression typeof '123' return in JavaScript?

A). number

B). string

C). undefined

D). boolean

Which of the following statements accurately describes the Boolean data type in JavaScript?

A). It represents textual data

B). It represents numeric data

C). It represents logical values

D). It represents an absence of value

Which data type represents variables that have been explicitly set to have no value?

A). Number

B). Undefined

C). String

D). Null

What does the expression typeof Symbol() return in JavaScript?

A). number

B). string

C). symbol

D). boolean

What is the purpose of the Null data type in JavaScript?

A). To represent numeric values

B). To represent an intentional absence of value

C). To represent textual data

D). To represent logical values

Which of the following statements accurately describes the Boolean data type in JavaScript?

A). It represents textual data

B). It represents numeric data

C). It represents logical values

D). It represents an absence of value