Answer & Solution
var
, let
, or const
inside a function, it becomes a global variable.
var
, let
, or const
inside a function?
var
, let
, or const
inside a function, it becomes a global variable.
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
In Node.js, what is the global object called?
A). window
B). global
C). document
D). process
Which keyword is used to declare a variable in the global scope?
A). let
B). var
C). const
D). function
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
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 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
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
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 of the following can be used to prevent accidental modification of global variables?
A). Encapsulation
B). Namespace
C). Strict mode
D). Block scoping
What keyword is used to ensure a variable is block-scoped?
A). var
B). global
C). let
D). window