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"In that case, Erlang might work as a prototyping language."

If you can write reasonably idiomatic Erlang from the get-go (design things in terms of gen_servers and such, instead of single-process monoliths), Erlang is a great prototyping language, because anywhere you send a message and receive something back is a point where you can drop in some other implementation of that particular bit without affecting the system as a whole.

You'll find in practice that the only time you'll be tempted to do that is if something is computationally expensive. Erlang is pretty darned good at reading from and writing to sockets in general.

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