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
Which keyword allows variable redeclaration in JavaScript?
A). A. var
B). B. let
C). C. const
D). D. none of the above
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
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 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 behavior of a redeclared variable in JavaScript with const?
A). A. It retains its original value
B). B. It becomes undefined
C). C. It throws a SyntaxError
D). D. It inherits the value from the outer scope
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
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 output of the following code snippet?
A). A. 10
B). B. 20
C). C. 30
D). D. Error
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