What consequences can arise if the channel remains open and is not closed in the program?

If a channel in Go remains open and is not closed, the following consequences may occur:

• Goroutine blocking: if the receiver is waiting for the channel to close to finish its work, it may hang forever.
• Resource leaks: goroutines waiting to read from the channel may not terminate, leading to memory leaks.
• Unpredictable program behavior: logic that depends on the channel being closed (for example, ending a for range loop) will not work.

It is important to close the channel when no more data will be sent, so that receivers can correctly handle the end of transmission.

ch := make(chan int)
go func() {
    for i := 0; i < 5; i++ {
        ch <- i
    }
    close(ch) // Close the channel after sending all data
}()

for val := range ch {
    fmt.Println(val)
}