How can you avoid redeclaring variables in JavaScript?

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 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

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 the result of the following code snippet?

A). A. SyntaxError is thrown

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. 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

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 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 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

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