Answer & Solution
Answer: Option B
Solution:
javascript var num = 10; var num = 20; console.log(num); The variable num is redeclared with a new value of 20, so the output is 20.
Q
What is the output of the following code snippet?
Related Questions on Average
What is the output of the following code snippet?
A). A. SyntaxError is thrown
B). B. 20
C). C. 30
D). D. undefined
Which keyword allows variable redeclaration in JavaScript?
A). A. var
B). B. let
C). C. const
D). D. none of the above
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
What is the behavior of a redeclared variable in JavaScript with let or const within nested scopes?
A). A. It inherits the value from the outer scope
B). B. It retains its original value within the nested scope
C). C. It throws an error
D). D. It becomes undefined
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
Which keyword allows redeclaring variables in JavaScript?
A). A. let
B). B. var
C). C. const
D). D. Both A and C
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
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
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