How can I identify impure functions in my code?

How can I identify impure functions in my code?

Impure functions are those that can produce different outputs for the same inputs or have side effects. Look for functions that modify external state or rely on external variables.

Can you give me an example of an impure function?

Sure! A function that updates a global variable or interacts with a database is impure. For instance, a function that increments a global counter each time it's called.

What are the consequences of using impure functions?

Impure functions can lead to unpredictable behavior, making debugging and testing more difficult. They can also hinder code reusability.

How can I refactor an impure function to make it pure?

You can refactor it by removing side effects and ensuring it only relies on its input parameters. Return new values instead of modifying external state.