Pure functional programming allows us to write clean and modular code. But to write real programs, we have to interact with the outside world through I/O. Does this mean that we must resort to side-effects and abandon functional techniques? In this talk, we will see that the answer is exactly the contrary; side-effects make I/O harder, not easier.

We will discuss how to approach I/O from a purely functional perspective, explore the space of existing solutions, their benefits, and drawbacks.