Answer & Solution
Answer: Option A
Solution:
The var keyword in JavaScript allows hoisting of variables within their scope, whereas let and const have a different hoisting behavior.
Q
Which keyword allows hoisting of variables in JavaScript?
Related Questions on Average
How does hoisting affect const declarations in JavaScript?
A). A. const variables are hoisted with their initial values
B). B. const variables are hoisted but cannot be accessed before declaration
C). C. const variables are hoisted and can be accessed before declaration
D). D. Hoisting does not affect const declarations
How can you ensure that a const variable is initialized before use in JavaScript?
A). A. Use let instead of const for all variables
B). B. Declare const variables at the top of their scope
C). C. Assign a default value to const variables
D). D. None of the above
How does hoisting differ between let and var declarations in JavaScript?
A). A. Both let and var variables are hoisted with their initial values
B). B. let variables are hoisted with their initial values, var variables are hoisted with undefined
C). C. let variables are not hoisted, var variables are hoisted with their initial values
D). D. Hoisting behavior is the same for let and var declarations
What is the behavior of accessing a let variable before its declaration in JavaScript?
A). A. SyntaxError
B). B. ReferenceError
C). C. undefined
D). D. No error
What is the purpose of the Temporal Dead Zone (TDZ) in JavaScript?
A). A. To prevent variable reassignment
B). B. To catch errors at compile time
C). C. To ensure variables are initialized before use
D). D. To reduce memory usage
What happens if you try to reassign a const variable in JavaScript?
A). A. No effect on the variable
B). B. SyntaxError is thrown
C). C. ReferenceError is thrown
D). D. TypeError is thrown
What is the result of the following code snippet?
A). A. SyntaxError
B). B. ReferenceError
C). C. TypeError
D). D. No error
How does hoisting affect arrow functions in JavaScript?
A). A. Arrow functions are hoisted with their function bodies
B). B. Arrow functions are hoisted but cannot be accessed before declaration
C). C. Arrow functions are not hoisted
D). D. Hoisting has no effect on arrow functions
What is the output of the following code snippet?
A). A. TypeError
B). B. 10
C). C. undefined
D). D. SyntaxError
What happens if you access a var variable before its declaration in JavaScript?
A). A. ReferenceError
B). B. TypeError
C). C. undefined
D). D. No error