Answer & Solution
Answer: Option D
Solution:
When redeclaring a variable with var, the variable reference is updated to the new value, and no error is thrown.
Q
What is the behavior when redeclaring a variable with var in JavaScript?
Related Questions on Average
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. SyntaxError is thrown
B). B. 20
C). C. 30
D). D. undefined
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
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
Which keyword allows redeclaring variables in JavaScript?
A). A. let
B). B. var
C). C. const
D). D. Both A and C
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 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 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. 10
C). C. 20
D). D. 30
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