What are global variables in JavaScript?

What are global variables in JavaScript?

Global variables in JavaScript are variables that are accessible from any part of your code, regardless of where they are declared.

How do I declare a global variable?

You can declare a global variable by simply defining it outside of any function or by using the var, let, or const keywords without any function scope.

Can global variables cause issues in my code?

Yes, global variables can lead to issues like naming conflicts and unintended side effects, making your code harder to debug.

How can I avoid using global variables?

You can avoid global variables by using local variables within functions, or by encapsulating your code in modules.