Answer & Solution
Answer: Option C
Solution:
Block scope in loops confines variables to their loop block, preventing hoisting and maintaining scope within each iteration.
Q
What is the benefit of block scope in loops?
Related Questions on Average
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 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
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
How does block scope help prevent variable hoisting issues?
A). By moving variables to the top of the code
B). By restricting variables to their block
C). By making variables accessible globally
D). By assigning default values to variables
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(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(outerVar); outside outerFunction if let outerVar = 'Outer'; is declared inside outerFunction?
A). Outer
B). undefined
C). Error
D). null
Which keyword introduces block-scoped variables in JavaScript?
A). var
B). let
C). const
D). function
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