Q
Which of the following can create a global variable?

Answer & Solution

Answer: Option A
Solution:
Only var can create a global variable when declared outside any function. let and const do not create global object properties.
Related Questions on Average

What is the global object in a browser environment?

A). window

B). global

C). document

D). this

How can you access a global variable inside a function if it has the same name as a local variable?

A). By using the window object

B). By using the global object

C). By using a different name for the global variable

D). By using the this keyword

What is the output of typeof window in a browser environment?

A). object

B). undefined

C). function

D). global

Which of the following methods can help in avoiding global variables?

A). Using functions to encapsulate code

B). Using objects to namespace code

C). Using ES6 modules

D). All of the above

What is the output of console.log(window.globalLet); if let globalLet = 'Hello'; is declared in the global scope?

A). Hello

B). undefined

C). error

D). null

Which statement is true about global variables in JavaScript?

A). They are not accessible inside functions

B). They can be accessed and modified from any part of the code

C). They are constants

D). They can only be read, not modified

What keyword is used to ensure a variable is block-scoped?

A). var

B). global

C). let

D). window

In Node.js, what is the global object called?

A). window

B). global

C). document

D). process

How can you avoid global scope pollution?

A). By using local variables

B). By using IIFE (Immediately Invoked Function Expressions)

C). By using modules

D). All of the above

What will be the output of console.log(window.myVar); if var myVar = 'Hello'; is declared outside any function?

A). Hello

B). undefined

C). error

D). null