var, let, or const inside a function?
var, let, or const inside a function, it becomes a global variable.
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 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 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
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
What is the output of typeof window in a browser environment?
A). object
B). undefined
C). function
D). global
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
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 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