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
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
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 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. 10
C). C. 20
D). D. 30
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
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 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. 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