Channels are a typed conduit through which you can send and receive values with the channel operator, <-.

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

(The data flows in the direction of the arrow.)

Like maps and slices, channels must be created before use:

eventsChannel := make(chan int)

By default, sends and receives block until the other side is ready. This allows goroutines to synchronize without explicit locks or condition variables.

Channels can be buffered. Provide the buffer length as the second argument to make to initialize a buffered channel:

ch := make(chan int, 100)

Sends to a buffered channel block only when the buffer is full. Receives block when the buffer is empty.

• channels mechanics
• receiving data from channel
• channels length
• buffers
• channel closing
• generate data with channels
• timers, tickers with channels
• worker pool
• rate limiting with channels
• selecting proper channel stream
• pipeline and fan-in/fan-out patterns

Feel free to browse channels chapter source code