Answer & Solution
Answer: Option A
Solution:
javascript let num = 10; let num = 20; console.log(num); Redeclaring num with let throws a SyntaxError in JavaScript.
Q
What is the result of the following code snippet?
Related Questions on Average
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
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 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 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
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 output of the following code snippet?
A). A. SyntaxError is thrown
B). B. 20
C). C. 30
D). D. undefined
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
What is the output of the following code snippet?
A). A. 10
B). B. 20
C). C. 30
D). D. Error
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 should you use to avoid redeclaring variables in JavaScript?
A). A. var
B). B. let
C). C. const
D). D. Both B and C