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

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 logged to the console after executing the code above?

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

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

C). ['yellow']

D). Error

What will be the output of the code above?

A). 10

B). 20

C). Error

D). Undefined

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 will be the output of the code above?

A). 30

B). 31

C). TypeError

D). 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

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;

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

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

What does the const keyword signify in JavaScript?

A). Constant variable

B). Mutable variable

C). Global variable

D). Block-scoped variable