Day - 7 | Notion

Channels are like pipe through which you can send and receive values with the channel operator <-. This allows go-routines to synchronize without explicit lock or condition variables.

ch <- v    // Send v to channel ch.
v := <-ch  // Receive from ch, and
           // assign value to v.

Example
Channels can be buffered. Provide the buffer length as the second argument to make to initialize a buffered channel: ch := make(chan int, 100).
A sender can close a channel to indicate that no more values will be sent. Receivers can test whether a channel has been closed by assigning a second parameter to the receive expression: after v, ok := <-ch ; ok is false if there are no more values to receive and the channel is closed.
The loop for i := range c receives values from the channel repeatedly until it is closed.

The select statement lets a go-routine wait on multiple communication operations. A select blocks until one of its cases can run, then it executes that case. It chooses one at random if multiple are ready.

The default case in a select is run if no other case is ready. Use a default case to try a send or receive without blocking:

The loop `for i := range c` receives values from the channel repeatedly until it is closed.