What is the most memorable case of using goroutines in your development experience?

One of the most memorable cases of using goroutines in my practice was building a high-performance server that handled many concurrent network connections.

Goroutines allowed for easy and efficient launching of lightweight threads for each connection without significant system resource costs. As a result, the server could serve thousands of clients simultaneously without blocking the main thread.

Example:

func handleConnection(conn net.Conn) {
    defer conn.Close()
    // handle connection
}

func main() {
    listener, _ := net.Listen("tcp", ":8080")
    for {
        conn, _ := listener.Accept()
        go handleConnection(conn) // launch a goroutine for each client
    }
}

This approach significantly simplifies the code and enhances the scalability of applications, especially in network and concurrent tasks.