chan chan question

[joe mcguckin]

I've been playing with this example code on the playground: https://play.golang.org/p/4l57Hqw9CLJ

In func  'goroutine':

       select {

        case errChan := <-requestChan:

How does this work? Does a channel send its name? Is 'errChan' some sort of special symbol?

[Thomas Bushnell, BSG]

You can send any object you like across a channel of the appropriate type. It sends the actual object (in this case, the channel) just as for an integer, it sends the value, or for a map, the whole map.

errChan in the snippet you quote is an ordinary variable, and this is its declaration (like any := case).

The type of requestChan is "<-chan chan error", so the thing you read off it is "chan error", which means the type of errChan is a "chan error". (If you read from errChan, you get an "error".)

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[joe mcguckin]

Thanks!