What happens if you try to access a block-scoped variable outside its block?

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

Which keyword introduces block-scoped variables in JavaScript?

A). var

B). let

C). const

D). function

What is block scope in JavaScript?

A). Variables scoped globally

B). Variables scoped within a function

C). Variables scoped to a block

D). Variables scoped to an object

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 can you access a variable declared in an inner block from an outer block?

A). Using the var keyword

B). Using the let keyword

C). Using the const keyword

D). Using the this keyword

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 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 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

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