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

What will be the output of the code above?

A). A. 10

B). B. 20

C). C. Error

D). D. Undefined

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

A). A. Function body

B). B. if statement body

C). C. while loop body

D). D. Object literal

Which of the following statements is true about block scope in JavaScript?

A). A. Variables declared with let have global scope

B). B. Variables declared with let have function scope

C). C. Variables declared with let are block-scoped

D). D. Variables declared with let are hoisted

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

What is the primary difference between const and let in JavaScript?

A). A. const variables can be reassigned

B). B. let variables are block-scoped

C). C. const variables are hoisted

D). D. let variables are immutable

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 purpose of using block scope in JavaScript?

A). A. To declare constants

B). B. To prevent variable hoisting

C). C. To improve code performance

D). D. To create global variables

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 is the purpose of using the const keyword in JavaScript?

A). A. To declare variables with global scope

B). B. To declare block-scoped variables

C). C. To declare variables that can be reassigned

D). D. To declare variables that cannot be 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