In Erlang, the pureness allows a clean split between processes and enables that clustering and hot loading magic. While it's less efficient for a single operati

In Erlang, the pureness allows a clean split between processes and enables that clustering and hot loading magic. While it's less efficient for a single operation, it scales to handle many parallel operations way better. This is generally why pure functional is hyped. It's just easier to think of a pure functional construct, there's less possibility for mistake. No one claims it to be efficient at single operations. Though some people blame the hardware for that, as in theory, there's nothing slower about it.