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

What will be the output of the code above?

A). 30

B). 31

C). Error

D). Undefined

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

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 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 primary advantage of using block scope in JavaScript?

A). Reducing code size

B). Preventing variable hoisting

C). Avoiding global variables

D). Improving performance

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

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

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

What will be the output of the code above?

A). 10

B). 20

C). Error

D). Undefined

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