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ØMQ is a software library that lets you quickly design and implement a fast message-based application.

The client/server example was particularly enjoyable to port from C++, as it gives shorter and easier to read/comprehend code.
Reminder: ‘||’ in a function call creates a closure. One could use func {} instead but my personal preference goes to the double bars, because it’s lighter on the eyes and infers the types of arguments from the signature of the called function. E.g. list each(|x| x toString() println())