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
How can you ensure variable immutability within a block?
A). Declare the variable with var
B). Declare the variable with let
C). Declare the variable with const
D). Assign a default value
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 is the output of console.log(outerVar); outside outerFunction if let outerVar = 'Outer'; is declared inside outerFunction?
A). Outer
B). undefined
C). Error
D). null
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 benefit of block scope in JavaScript?
A). It reduces variable conflicts
B). It increases global scope
C). It simplifies variable declarations
D). It makes variables inaccessible
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(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 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
What happens if you try to access a block-scoped variable outside its block?
A). The variable is accessible globally
B). The variable is accessible within its block
C). An error occurs
D). The variable is accessible within a function