Modern JavaScript from the Beginning - Second Edition - Global and Function Scope

The video tutorial explains the concept of scope in JavaScript, focusing on global and function scope. It describes how global variables are accessible from anywhere and introduces the window object, which contains methods and properties accessible globally. The tutorial also covers creating global variables and accessing them within functions and blocks. It explains function scope, variable shadowing, and the concept of local scope. The video concludes with a brief mention of block scope, setting the stage for the next tutorial.

What is the window object in JavaScript?

• A block of code that runs automatically

• A global object that provides methods and properties for the browser

• A function that creates new variables

• A method to alert users

How can you access a global variable in a function?

• By using a special keyword

• By directly using its name

• By using the window object

• By declaring it again inside the function

What happens when you declare a variable with the same name inside a function?

• It creates a new global variable

• It overwrites the global variable

• It creates a local variable that shadows the global one

• It causes an error

What is variable shadowing?

• When a variable is declared inside a block

• When a variable is declared but not used

• When a variable is used in multiple functions

• When a global variable is hidden by a local variable with the same name

Can you access a function-scoped variable outside its function?

• Yes, if it's declared with 'let'

• No, function-scoped variables are not accessible outside

• Yes, if it's declared with 'var'

• Yes, if it's declared with 'const'

What does local scope refer to?

• The scope of variables declared globally

• The scope within a specific function or block

• The scope of variables declared with 'var'

• The scope of variables declared with 'let'

What is the difference between global and local scope?

• There is no difference, they are the same

• Global scope is accessible everywhere, local scope is limited to a function or block

• Local scope is accessible everywhere, global scope is limited to a function

• Global scope is only for variables, local scope is for functions