You want to implement fmt.Formatter
<https://pkg.go.dev/fmt?tab=doc#Formatter>.
In general I prefer implementing Formatter to either Stringer or GoStringer
if I am only doing it for printing, even for the simple cases, as I feel it
better reflects the intent.
I reserve implementing the String method for when I really do want to be
able to access the value programmatically as a string and it is possible to
do so in a way that is more efficient than printing it.
On Wed, Jun 24, 2020 at 4:33 PM yves baumes <ybau...@gmail.com> wrote:
> When I want to override the '%v' format, I declare a String() method.
> When I want to override the '%#v' format, I declare a GoString() method.
>
> But there is nothing about '%+v'? There is no PlusStringer() method ?
>
> Let's take the following exemple, the %v and %+v formatter prints the
> exact same results. Which is annoying somehow..
>
> ```
> package main
>
> import ("fmt")
>
> type page struct {
> title string
> body []byte
> }
>
> func (p *page) String() string {
> return fmt.Sprint("{ ", p.title, " ", string(p.body), " }")
> }
>
> func main() {
> const title = "helloworld"
> const text = "Hello everyone"
> p := &page{title: title, body: []byte(text)}
> log.Printf("p = %v", p) // prints p = { helloworld Hello everyone }
> log.Printf("p = %+v", p) // prints p = { helloworld Hello everyone }
> log.Printf("p = %#v", p) // prints p = &main.page{title:"helloworld",
> body:[]uint8{0x48, 0x65, 0x6c, [etc]
> }
>
> ```
>
> Any clue on how to adapt the String() method to print the fields names?
>
>
>
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