What will happen when you try to execute this code?

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 will be the output of the code above?

A). 10

B). 20

C). Error

D). Undefined

What will be the output of the code above?

A). 30

B). 31

C). TypeError

D). Undefined

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 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 does the const keyword signify in JavaScript?

A). Constant variable

B). Mutable variable

C). Global variable

D). Block-scoped variable

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 be logged to the console after executing the code above?

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

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

C). ['yellow']

D). Error

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