Answer & Solution
Answer: Option B
Solution:
var is function-scoped, while let is block-scoped, meaning let variables are limited to their block of declaration.
Q
What is the main difference between var and let in terms of scope?
Related Questions on Average
What is the output of console.log(i); outside the loop if let i = 10; is declared inside a loop?
A). 10
B). undefined
C). Error
D). 0
How does block scope affect the visibility of variables in nested blocks?
A). Variables are only visible within their immediate block
B). Variables are visible within all nested blocks
C). Variables are only visible within functions
D). Variables are globally visible
What is the benefit of block scope in loops?
A). It allows variables to be reassigned within each iteration
B). It prevents variable hoisting
C). It restricts variables to the loop block
D). It makes variables globally accessible
What is the output of console.log(innerVar); outside exampleFunction if let innerVar = 'Hello'; is declared inside exampleFunction?
A). Hello
B). undefined
C). Error
D). null
What is the output of console.log(blockVar); outside a block if let blockVar = 'Block'; is declared inside a block?
A). Block
B). undefined
C). Error
D). null
What does the Temporal Dead Zone (TDZ) refer to?
A). A zone with no variables
B). A zone where variables are in memory but not accessible
C). A zone where variables are accessible globally
D). A zone with limited variable scope
What is the purpose of block scope in JavaScript?
A). To limit the visibility and accessibility of variables
B). To make variables global
C). To create constants
D). To execute functions
Which of the following correctly defines a block scope?
A). A scope that encompasses the entire codebase
B). A scope that encompasses a function
C). A scope that encompasses a block of code delimited by curly braces
D). A scope that encompasses an object
What happens when you declare a constant with const inside a block and try to reassign it?
A). It throws an error
B). It allows reassignment
C). It assigns the value globally
D). It assigns a default value
Which keyword introduces block-scoped variables in JavaScript?
A). var
B). let
C). const
D). function