Q
Which of the following is NOT an example of a block in JavaScript?

Answer & Solution

Answer: Option D
Solution:
In JavaScript, object literals are not considered blocks, whereas function bodies, if statement bodies, and loop bodies are examples of blocks with block scope.
Related Questions on Average

Which keyword is used to declare a constant array in JavaScript?

A). A. let

B). B. const

C). C. var

D). D. array

What does the const keyword signify in JavaScript?

A). A. Constant variable

B). B. Mutable variable

C). C. Global variable

D). D. Block-scoped variable

Which of the following statements about const is true?

A). A. Variables declared with const can be reassigned

B). B. const variables have function scope

C). C. const variables cannot be used in loops

D). D. const variables are block-scoped

What happens if you try to reassign a value to a constant declared using const?

A). A. SyntaxError

B). B. TypeError

C). C. ReferenceError

D). D. No error, value is reassigned

What is the primary advantage of using block scope in JavaScript?

A). A. Reducing code size

B). B. Preventing variable hoisting

C). C. Avoiding global variables

D). D. Improving performance

How can you declare a constant named PI with a value of 3.14 in JavaScript using const?

A). A. const PI = 3.14;

B). B. PI = 3.14;

C). C. let PI = 3.14;

D). D. var PI = 3.14;

What will be logged to the console?

A). A. 'Alice'

B). B. 'Bob'

C). C. TypeError

D). D. Undefined

What will be the output of the code above?

A). A. [1, 2, 3, 4]

B). B. [1, 2, 3]

C). C. [1, 2, 3, 4, 5]

D). D. Error

What will be the output of the code above?

A). A. 30

B). B. 31

C). C. Error

D). D. Undefined

What will be the output of the code above?

A). A. 10

B). B. 20

C). C. Error

D). D. Undefined