Nil channel usage

A nil channel blocks forever on send and receive operations, causing your program to hang indefinitely. To fix this, initialize the channel with make before using it.

ch := make(chan int)

If you need a channel that is always closed (for immediate non-blocking sends), initialize it as a nil channel and close it immediately, or use a buffered channel with capacity 0 if you need synchronization.

A nil channel is like a door that hasn't been built yet; trying to walk through it (send or receive) makes you wait forever. You must build the door (initialize the channel with make) before anyone can use it. This prevents your program from getting stuck waiting for something that will never happen.