Which keyword should you use to avoid 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

What is the result of the following code snippet?

A). A. SyntaxError is thrown

B). B. 10

C). C. 20

D). D. 30

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

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

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 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 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 behavior when redeclaring a variable with var 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