var outside of any function declares a global variable, whereas let and const do not create properties on the global object.
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
How do you declare a global variable inside a function?
A). Using var
B). Using let
C). Using const
D). Assigning to window
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
In Node.js, what is the global object called?
A). window
B). global
C). document
D). process
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 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
What is the output of console.log(globalThis === window); in a browser environment?
A). 1
B). 0
C). undefined
D). null
Can global variables lead to name collisions in large codebases?
A). Yes
B). No
C). Only if not managed properly
D). Only in strict mode
Which of the following can create a global variable?
A). var
B). let
C). const
D). All of the above
What is the output of typeof window in a browser environment?
A). object
B). undefined
C). function
D). global