Answer & Solution
global
.
global
.
What is the output of typeof window
in a browser environment?
A). object
B). undefined
C). function
D). global
What is the purpose of the global object in JavaScript?
A). To store local variables
B). To provide a namespace for global variables and functions
C). To define constants
D). To execute code in strict mode
What keyword is used to ensure a variable is block-scoped?
A). var
B). global
C). let
D). window
What is the output of console.log(globalThis === window);
in a browser environment?
A). 1
B). 0
C). undefined
D). null
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
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
Which of the following can create a global variable?
A). var
B). let
C). const
D). All of the above
Which of the following can be used to prevent accidental modification of global variables?
A). Encapsulation
B). Namespace
C). Strict mode
D). Block scoping
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