Answer & Solution
window
, e.g., window.myVar = 'value';
window
, e.g., window.myVar = 'value';
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 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
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
Which of the following can create a global variable?
A). var
B). let
C). const
D). All of the above
Which statement is true about global variables in JavaScript?
A). They are not accessible inside functions
B). They can be accessed and modified from any part of the code
C). They are constants
D). They can only be read, not modified
What keyword is used to ensure a variable is block-scoped?
A). var
B). global
C). let
D). window
What is the global object in a browser environment?
A). window
B). global
C). document
D). this
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 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