How to Implement the Tee Channel Pattern in Go

The Tee Channel pattern is implemented by creating a goroutine that reads from a source channel and writes to multiple destination channels until the source closes.

func tee[T any](src <-chan T, dests ...chan<- T) {
    defer func() {
        for _, d := range dests {
            close(d)
        }
    }()
    for v := range src {
        for _, d := range dests {
            d <- v
        }
    }
}

This pattern duplicates data from one channel to many, ensuring all destinations receive the same stream of values and are closed when the source ends.

The Tee Channel pattern acts like a video splitter, taking one data stream and copying it to multiple outputs simultaneously. It matters when you need to send the same information to several different parts of your program without duplicating the source logic. Think of it as a broadcast system where one sender reaches many listeners at once.