What is variable shadowing and how does it work in different programming languages?

What is variable shadowing and how does it work in different programming languages?

Variable shadowing occurs when a variable declared within a certain scope (like a function) has the same name as a variable in an outer scope. This can lead to confusion about which variable is being referenced.

Can you give me examples of variable shadowing in languages like JavaScript and Python?

Sure! In JavaScript, if you declare a variable inside a function with the same name as a global variable, the function will use the local variable. In Python, a similar thing happens, but it also allows you to use the nonlocal keyword to refer to a variable in an enclosing scope.

Are there any potential issues with variable shadowing?

Yes, variable shadowing can lead to bugs and make code harder to read and maintain, as it can be unclear which variable is being used.

How can I avoid variable shadowing in my code?

To avoid variable shadowing, use unique variable names, follow naming conventions, and be mindful of the scope in which you declare your variables.