What are some common misconceptions about pure functions?

What are some common misconceptions about pure functions?

One common misconception is that pure functions can't have any side effects, but they can still interact with external systems in a controlled way.

Can you explain what a pure function is?

A pure function is a function where the output is determined only by its input values, without observable side effects.

Are pure functions always faster than impure functions?

Not necessarily. While pure functions can be optimized better due to their predictability, performance depends on various factors.

Do pure functions have to return the same output for the same input?

Yes, pure functions always return the same output for the same input, which is a key characteristic that defines them.

How do pure functions help in functional programming?

Pure functions enhance predictability and testability, making it easier to reason about code and avoid unintended side effects.