Answer & Solution
Answer: Option D
Solution:
To avoid accidental variable redeclaration, use let or const for variable declarations within the same scope and declare variables once.
Q
How can you avoid accidentally redeclaring variables in JavaScript?
Related Questions on Average
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 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
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 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
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 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. 20
C). C. 30
D). D. Error
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