Which keyword is used to declare block-scoped variables in JavaScript?
A). var
B). let
C). const
D). block
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
What will be the output of the code above?
A). 30
B). 31
C). TypeError
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 of the following statements about const is true?
A). Variables declared with const can be reassigned
B). const variables have function scope
C). const variables cannot be used in loops
D). const variables are block-scoped
What will be the output of the code above?
A). 10
B). 20
C). Error
D). Undefined
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 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 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 will happen when you try to execute this code?
A). 14 will be logged to the console
B). 14159 will be logged to the console
C). SyntaxError will occur
D). TypeError will occur