Which keyword allows variable redeclaration in JavaScript?

Which keyword should you use to avoid redeclaring variables in JavaScript?

A). A. var

B). B. let

C). C. const

D). D. Both B and C

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 output of the following code snippet?

A). A. 10

B). B. 20

C). C. 30

D). D. Error

What is the result of the following code snippet?

A). A. SyntaxError is thrown

B). B. 20

C). C. 30

D). D. Error

What is the behavior of a redeclared variable in JavaScript with let or const within nested scopes?

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

B). B. It retains its original value within the nested scope

C). C. It throws an error

D). D. It becomes undefined

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

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 output of the following code snippet?

A). A. SyntaxError is thrown

B). B. 20

C). C. 30

D). D. undefined

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

What is the result of the following code snippet?

A). A. SyntaxError is thrown

B). B. 10

C). C. 20

D). D. 30