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
Which keyword introduces block-scoped variables in JavaScript?
A). var
B). let
C). const
D). function
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
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(outerVar); outside outerFunction if let outerVar = 'Outer'; is declared inside outerFunction?
A). Outer
B). undefined
C). Error
D). null
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 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 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
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