Answer & Solution
let
and const
in the global scope are not properties of the window
object.
console.log(window.globalLet);
if let globalLet = 'Hello';
is declared in the global scope?
let
and const
in the global scope are not properties of the window
object.
What is the global object in a browser environment?
A). window
B). global
C). document
D). this
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
Which keyword is used to declare a variable in the global scope?
A). let
B). var
C). const
D). function
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 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(globalThis === window);
in a browser environment?
A). 1
B). 0
C). undefined
D). 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
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