What are the differences between global and local scope in JavaScript?

What are the differences between global and local scope in JavaScript?

In JavaScript, global scope refers to variables that are accessible from anywhere in your code, while local scope refers to variables that are only accessible within a specific function or block.

Can you give me an example of each?

Sure! A global variable can be declared outside of any function, like var globalVar = 'I am global';. A local variable is declared within a function, like function myFunction() { var localVar = 'I am local'; }.

What happens if I try to access a local variable outside its function?

If you try to access a local variable outside its function, you'll get a reference error because the variable is not defined in that scope.

Are there any exceptions to this rule?

Yes, if you declare a variable with var inside a function, it will be local. However, if you use window or this in a browser context, you can access it globally.