What is the behavior of a redeclared variable in JavaScript?

Which keyword allows redeclaring variables in JavaScript?

A). A. let

B). B. var

C). C. const

D). D. Both A and C

How can you avoid redeclaring variables in JavaScript?

A). A. Always use var for variable declarations

B). B. Declare variables once and avoid redeclaration

C). C. Declare variables multiple times for clarity

D). D. Use the same variable name for different values

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

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

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

A). A. No effect on the variable

B). B. SyntaxError is thrown

C). C. Variable value is changed to undefined

D). D. Variable reference is updated

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 scope of a redeclared variable in JavaScript with let or const?

A). A. Global scope

B). B. Function scope

C). C. Block scope

D). D. Module scope

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

What is variable redeclaring in JavaScript?

A). A. Changing the value of a variable

B). B. Declaring the same variable again within the same scope

C). C. Deleting a variable

D). D. Assigning multiple values to a variable

What is the result of the following code snippet?

A). A. SyntaxError is thrown

B). B. 10

C). C. 20

D). D. 30