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

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 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 output of the following code snippet?

A). A. SyntaxError is thrown

B). B. 20

C). C. 30

D). D. undefined

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

How can you avoid accidentally redeclaring variables in JavaScript?

A). A. Always use var for variable declarations

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

C). C. Declare variables once and avoid redeclaration

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

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 let or const 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

Which keyword allows variable redeclaration in JavaScript?

A). A. var

B). B. let

C). C. const

D). D. none of the above

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 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