var, let, or const inside a function?
var, let, or const inside a function, it becomes a global variable.
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 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
In Node.js, what is the global object called?
A). window
B). global
C). document
D). process
How do you declare a global variable inside a function?
A). Using var
B). Using let
C). Using const
D). Assigning to window
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
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 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 global object in a browser environment?
A). window
B). global
C). document
D). this
What keyword is used to ensure a variable is block-scoped?
A). var
B). global
C). let
D). window