Which of the following can be used to prevent accidental modification of global variables?

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

How do you declare a global variable inside a function?

A). Using var

B). Using let

C). Using const

D). Assigning to window

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 happens if you declare a variable inside a function with the same name as a global variable?

A). It creates a new local variable

B). It throws an error

C). It modifies the global variable

D). It assigns the global variable to null

What is the global object in a browser environment?

A). window

B). global

C). document

D). this

Which of the following can create a global variable?

A). var

B). let

C). const

D). All of the above

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

A). var

B). global

C). let

D). window

What is the output of console.log(globalVar); if globalVar = 'Hello'; is assigned inside a function without using var, let, or const?

A). Hello

B). undefined

C). error

D). null

What is the output of console.log(globalThis === window); in a browser environment?

A). 1

B). 0

C). undefined

D). null

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

A). window

B). global

C). document

D). process