console.log(globalVar); if globalVar = 'Hello'; is assigned inside a function without using var, let, or const?
var, let, or const, globalVar becomes a global variable and is accessible anywhere.
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
How do you declare a global variable inside a function?
A). Using var
B). Using let
C). Using const
D). Assigning to window
Which keyword is used to declare a variable in the global scope?
A). let
B). var
C). const
D). function
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
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 is the output of console.log(globalThis === window); in a browser environment?
A). 1
B). 0
C). undefined
D). null
What keyword is used to ensure a variable is block-scoped?
A). var
B). global
C). let
D). 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
In Node.js, what is the global object called?
A). window
B). global
C). document
D). process
What is the global object in a browser environment?
A). window
B). global
C). document
D). this