Q
Which of the following best describes the behavior of JavaScript's const keyword?

Answer & Solution

Answer: Option B
Solution:
The const keyword in JavaScript ensures that variables cannot be reassigned to a new value or reference after initialization, making them constant in terms of their assigned value.
Related Questions on Average

What happens if you try to declare a const variable without initializing it immediately?

A). SyntaxError

B). ReferenceError

C). TypeError

D). No error, the variable remains undefined

What is the benefit of using const over var in JavaScript?

A). const variables have function scope

B). const variables are hoisted to the top

C). const variables prevent accidental reassignments

D). const variables can be used anywhere

Which statement about JavaScript's const is true?

A). const variables can be redeclared

B). const variables are globally scoped

C). const variables are mutable

D). const variables cannot be reassigned

Which of the following statements is true about constants declared using const?

A). They can be reassigned multiple times

B). They are hoisted to the top

C). They are mutable

D). They are immutable

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

A). Function body

B). if statement body

C). while loop body

D). Object literal

What will happen when you try to execute this code?

A). 14 will be logged to the console

B). 14159 will be logged to the console

C). SyntaxError will occur

D). TypeError will occur

Which keyword is used to declare block-scoped variables in JavaScript?

A). var

B). let

C). const

D). block

What will be logged to the console after executing the code above?

A). ['red', 'blue', 'green', 'yellow']

B). ['red', 'blue', 'green']

C). ['yellow']

D). Error

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

A). const PI = 3.14;

B). PI = 3.14;

C). let PI = 3.14;

D). var PI = 3.14;

What will be the output of the code above?

A). 30

B). 31

C). TypeError

D). Undefined