Answer & Solution
Answer: Option B
Solution:
Block scope confines variables to their block, preventing hoisting issues where variables are hoisted to the top of the function or global scope.
Q
How does block scope help prevent variable hoisting issues?
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 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 is the main difference between var and let in terms of scope?
A). var is block-scoped, let is function-scoped
B). var is function-scoped, let is block-scoped
C). Both var and let are block-scoped
D). Both var and let are function-scoped
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(i); outside the loop if let i = 10; is declared inside a loop?
A). 10
B). undefined
C). Error
D). 0
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 JavaScript?
A). It reduces variable conflicts
B). It increases global scope
C). It simplifies variable declarations
D). It makes variables inaccessible
What is lexical scoping in JavaScript?
A). Variables scoped to the entire codebase
B). Variables scoped to their functions
C). Variables scoped based on their position in the code
D). Variables scoped based on their names
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 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