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
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
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
What keyword is used to ensure a variable is block-scoped?
A). var
B). global
C). let
D). window
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
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
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
Which of the following can create a global variable?
A). var
B). let
C). const
D). All of the above