What happens if you declare a variable with var and redeclare it with let or const within the same scope in JavaScript?

What is the output of the following code snippet?

A). A. SyntaxError is thrown

B). B. 20

C). C. 30

D). D. undefined

What is the behavior of a redeclared variable in JavaScript?

A). A. It retains its original value

B). B. It retains its last assigned value

C). C. It becomes undefined

D). D. It throws an error

Which keyword allows variable redeclaration in JavaScript?

A). A. var

B). B. let

C). C. const

D). D. none of the above

What is the result of the following code snippet?

A). A. SyntaxError is thrown

B). B. 10

C). C. 20

D). D. 30

What is the output of the following code snippet?

A). A. 10

B). B. 20

C). C. 30

D). D. Error

What is the behavior when redeclaring a variable with var in JavaScript?

A). A. SyntaxError is thrown

B). B. No effect on the variable

C). C. Variable value is changed

D). D. Variable reference is updated

What is the behavior of a redeclared variable in JavaScript with const?

A). A. It retains its original value

B). B. It becomes undefined

C). C. It throws a SyntaxError

D). D. It inherits the value from the outer scope

Which keyword allows redeclaring variables in JavaScript?

A). A. let

B). B. var

C). C. const

D). D. Both A and C

What is the scope of a redeclared variable in JavaScript with var?

A). A. Global scope

B). B. Function scope

C). C. Block scope

D). D. Module scope

How can you handle cases where you accidentally redeclare a variable in JavaScript?

A). A. Use var for all variable declarations

B). B. Use meaningful variable names to avoid conflicts

C). C. Use let or const for variable declarations within the same scope

D). D. Both B and C