Can Go Channels Handle Multiple Data Types?

Type Agnostic Channels in Go

Question:

In Go, is it possible to send multiple types of data through a single channel?

Example:

The following code attempts to send different types through a channel: http://play.golang.org/p/7p2Bd6b0QT.

Answer:

Yes, it is possible to create type agnostic channels in Go. To send multiple types through a channel, use:

greet := make(chan pet)

With this modification, you can send any type that implements the pet interface.

Sending Generic Data:

If you need to send completely generic data, create a channel of type chan interface{} and use reflection to determine the type of data received.

Example:

ch := make(chan interface{})

go func() {
    select {
    case p := <-ch:
        fmt.Printf("Received a %q", reflect.TypeOf(p).Name())
    }
}()

ch <- "this is it"

Using a Type Switch:

As an alternative to reflection, you can use a type switch with a select statement like this:

p := <-ch
switch p := p.(type) {
case string:
    fmt.Printf("Got a string %q", p)
default:
    fmt.Printf("Type of p is %T. Value %v", p, p)
}

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