var outside of any function declares a global variable, whereas let and const do not create properties on the global object.
What is the output of typeof window in a browser environment?
A). object
B). undefined
C). function
D). global
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
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
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
In Node.js, what is the global object called?
A). window
B). global
C). document
D). process
Can a global variable be accessed inside a function?
A). Yes
B). No
C). Only if passed as a parameter
D). Only if defined with var
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
How do you declare a global variable inside a function?
A). Using var
B). Using let
C). Using const
D). Assigning to window
What keyword is used to ensure a variable is block-scoped?
A). var
B). global
C). let
D). window
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