var, let, or const inside a function?
var, let, or const inside a function, it becomes a global variable.
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
How do you declare a global variable inside a function?
A). Using var
B). Using let
C). Using const
D). Assigning to 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
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
Which keyword is used to declare a variable in the global scope?
A). let
B). var
C). const
D). function
What is the output of console.log(globalThis === window); in a browser environment?
A). 1
B). 0
C). undefined
D). null
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
In Node.js, what is the global object called?
A). window
B). global
C). document
D). process