Writing to string buffer or file, including stdout

[Tong Sun]

Hi, 

I need to write a program that writes either to a string buffer or to a file, of which if file name is passed as "-", will write to stdout instead. 

What's the suggested way of doing this? 

Thanks

[Matt Harden]

This is what the io.Writer interface is for. Create the writer as a *bytes.Buffer using new(bytes.Buffer), an *os.File using os.Create(filename), or use os.Stdout. All of these implement io.Writer, which means they can all be written to by the standard Go libraries.

Note that for performance you should probably wrap *os.File or os.Stdout in a bufio.Writer, and run Flush on this writer when you're done.

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