What are the best practices for writing pure functions?

What are the best practices for writing pure functions?

Best practices for writing pure functions include avoiding side effects, using immutable data, and ensuring consistent output.

Can you explain what side effects are?

Side effects are changes that occur outside the function's scope, like modifying a global variable or performing I/O operations.

Why is immutability important in pure functions?

Immutability helps maintain the function's purity by ensuring that data cannot be changed unexpectedly, leading to predictable behavior.

Can you give an example of a pure function?

Sure! A simple example is a function that adds two numbers and returns the result without altering any external state.