What are the consequences of not closing the channel after use?

If you do not close a channel in Go after its use is complete, the following consequences may occur:

• Goroutine blocking: If other goroutines are waiting for data from the channel and it is not closed, they may wait indefinitely as they will not receive a signal that data transmission has ended.
• Resource leaks: Although the channel itself does not require explicit memory release, an unclosed channel can lead to logical errors and program hangs.
• Inability to correctly handle the end of transmission: A closed channel allows using for range or checking ok to determine that data has finished. Without closing, this is impossible.

Example of proper channel closing:

ch := make(chan int)
go func() {
    defer close(ch)
    for i := 0; i < 5; i++ {
        ch <- i
    }
}()

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

Here, the channel is closed after sending all values, allowing the range loop to terminate correctly.