solution/

This program reads from standard input and writes JSON-encoded messages to standard output.

This program extends part 1.

This program listens on the host and port specified by the -listen flag.

This program is a combination of parts 2 and 3.

This program extends part 4.

This program is functionally equivalent to part 5, but the reading from standard input and writing to the network connection are done by separate goroutines.

This program extends part 6 by adding a Peers type.

This program extends part 7.

This program extends part 8.

This program extends part 9.