Can global variables lead to name collisions in large codebases?

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

A). Encapsulation

B). Namespace

C). Strict mode

D). Block scoping

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

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 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

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

A). window

B). global

C). document

D). process

Which of the following can create a global variable?

A). var

B). let

C). const

D). All of the above

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

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

A). var

B). global

C). let

D). window

What happens if you declare a variable without var, let, or const inside a function?

A). It becomes a global variable

B). It becomes a local variable

C). It throws an error

D). It becomes a constant