How can you avoid accidentally redeclaring variables in JavaScript?

What is the result of the following code snippet?

A). A. SyntaxError is thrown

B). B. 20

C). C. 30

D). D. Error

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

Which keyword allows redeclaring variables in JavaScript?

A). A. let

B). B. var

C). C. const

D). D. Both A and C

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

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 statement about redeclaring variables in JavaScript is true?

A). A. Redeclaring variables is a best practice

B). B. Redeclaring variables leads to clearer code

C). C. Redeclaring variables can lead to confusion and bugs

D). D. Redeclaring variables has no effect

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

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 output of the following code snippet?

A). A. 10

B). B. 20

C). C. 30

D). D. Error