Answer & Solution
Answer: Option A
Solution:
Block scope confines variables to their immediate block, ensuring they are not visible outside that block or in nested blocks.
Q
How does block scope affect the visibility of variables in nested blocks?
Related Questions on Average
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 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
What is hoisting in JavaScript?
A). Moving variables to the top of their function or global scope
B). Making variables undefined
C). Creating new variables
D). None of the above
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
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 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
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 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(i); outside the loop if let i = 10; is declared inside a loop?
A). 10
B). undefined
C). Error
D). 0
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