Channels: Communication Between Goroutines

Channels

This lesson explains the main concept clearly with beginner-friendly examples and background so you can learn why the code works.

Channels are typed conduits that allow goroutines to communicate safely.

ch := make(chan int) // unbuffered channel

go func() { ch <- 42 }() // send
val := <-ch // receive
fmt.Println(val) // 42

Buffered channels

buf := make(chan string, 3) // capacity 3
buf <- "a"
buf <- "b"
fmt.Println(<-buf) // a

Closing channels

close(buf)
for v := range buf { fmt.Println(v) }

Select statement (multiplexing)

select {
case v := <-ch1:
    fmt.Println("from ch1", v)
case ch2 <- 99:
    fmt.Println("sent to ch2")
default:
    fmt.Println("no activity")
}