Avoid Global Variables

Lecture 185:- Avoid Global Variables

Global variables can be accessed from anywhere in the code, which can make them convenient to use. However, they can also make it difficult to track down bugs and can lead to naming conflicts. Therefore, it is generally considered a good practice to avoid global variables as much as possible.

One way to avoid global variables is to use closures. Closures are functions that have access to variables in their outer scope, even after the outer function has returned. By defining variables within a closure, you can ensure that they are not accessible outside of that closure, effectively limiting their scope.

Another way to avoid global variables is to use modules. A module is a self-contained piece of code that encapsulates functionality and data. By defining variables within a module, you can ensure that they are not accessible outside of that module, effectively limiting their scope.

Using strict mode can also help avoid global variables by making it an error to use undeclared variables. In strict mode, any attempt to assign a value to an undeclared variable will result in an error.

Finally, it is important to name variables carefully and to avoid naming conflicts. One way to do this is to use a naming convention that makes it clear what a variable represents and where it is used. Another way is to use namespaces, which are objects that provide a container for variables and functions. By defining variables and functions within a namespace, you can avoid naming conflicts with variables and functions defined in other parts of the code.