Communicating between goroutines using channels
More often than not, multiple goroutines have to communicate and coordinate to distribute work, manage state, and collate results of computations. Channels are the preferred mechanism for this. A channel is a synchronization mechanism with an optional fixed-size buffer.
Tip:
The following recipes show channels that are closed. Closing a channel is a method for communicating end of data. If you do not close a channel, it will be garbage collected when it is no longer referenced. In other words, you don't need to close a channel if you don't need to signal end of data to the receivers.
Sending and receiving data using channels
A goroutine can send to a channel if there is another goroutine waiting to receive from it, or in the case of a buffered channel, there is space available in the channel buffer. Otherwise, the goroutine is blocked until it can send.
A goroutine can receive from a channel if there is another...
