parallel

How to use multiple Futures in a Scala for-comprehension

If you want to create multiple Scala Futures and merge their results together to get a result in a for comprehension, the correct approach is to (a) first create the futures, (b) merge their results in a for comprehension, then (c) extract the result using onComplete or a similar technique.

Why we can easily distribute Erlang programs over multicores or networks

“In Erlang it’s OK to mutate state within an individual process but not for one process to tinker with the state of another process ... processes interact by one method, and one method only, by exchanging messages. Processes share no data with other processes. This is the reason why we can easily distribute Erlang programs over multicores or networks.”

Joe Armstrong, in the book Programming Erlang