fmt.Fprint or io.WriteString for http.ResponseWriter write?

[José Colón]

Hi gophers! Is it better to (w is an http.ResponseWriter)

fmt.Fprint(w, "Hello world")

or to 

io.WriteString(w, "Hello world")

or doesfmt.Fprint use io.WriteString behind the scenes, and thus they are equivalent?

[Christian Staffa]

When you check out the source code both, fmt.Fprint and io.WriteString, need a writer as the first argument. Writer is an interface type which provides an Write method. And thats exactly what that functions are calling.. the Write method of your provided w (which is http.ResponseWriter in your case).

The difference is that fmt.Fprint is formatting the arguments provided first in a buffer before calling w.Write.

And io.WriteString is checking if w provides the StringWriter interface and calls that instead.

https://golang.org/src/fmt/print.go?s=6466:6527#L221

https://golang.org/src/io/io.go?s=10163:10218#L279

But to answer your question. In your simple case I would use io.WriteString. If you have more arguments than you could only use fmt.Fprint or you prepare your string by yourself before calling io.WriteString.

Hope that helps (;

Christian

Sent from my iPhone

--
You received this message because you are subscribed to the Google Groups "golang-nuts" group.
To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.