Q
What will be the output of the code above?

Answer & Solution

Answer: Option C
Solution:
The Object.freeze() method prevents modifications to an object's properties. Attempting to modify person.age after freezing person will result in a TypeError because the object is now immutable.
Related Questions on Average

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

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

A). Reducing code size

B). Preventing variable hoisting

C). Avoiding global variables

D). Improving performance

In JavaScript, const variables are not hoiste What does this mean?

A). They are hoisted to the top of the block

B). They cannot be used before declaration

C). They are accessible in nested scopes

D). They are block-scoped variables

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

What will be the output of the code above?

A). 30

B). 31

C). Error

D). Undefined

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 is the primary distinction between const and let in JavaScript?

A). const variables are immutable

B). let variables are block-scoped

C). const variables have function scope

D). let variables can be reassigned

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

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

A). SyntaxError

B). TypeError

C). ReferenceError

D). No error, value is reassigned

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

A). It prevents variables from being redeclared

B). It ensures variables cannot be reassigned

C). It provides global scope for variables

D). It allows variables to change their data type