Answer & Solution
Answer: Option B
Solution:
To avoid redeclaring variables in JavaScript, declare variables once within the same scope and avoid redeclaration.
Q
How can you avoid redeclaring variables in JavaScript?
Related Questions on Average
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 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 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
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
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 result of the following code snippet?
A). A. SyntaxError is thrown
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
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
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