go-spew is a really good library, I don not need to write it myself, Thanks
在 2019年6月4日星期二 UTC+8上午8:19:55，kortschak写道：
>
> Sorry, missed the go- prefix in Dave's package.
>
> github.com/davecgh/go-spew
>
> On Tue, 2019-06-04 at 09:48 +0930, Dan Kortschak wrote:
> > There are packages already available for this.
> >
> > github.com/kortschak/utter (for Go syntax-like printing)
> > github.com/davecgh/spew (for less Go syntax-like printing)
> >
> >
> >
> > On Mon, 2019-06-03 at 08:54 -0700, 杜沁园 wrote:
> > >
> > > I recently write a program to recursively print all fields and
> > > value
> > > in a
> > > struct. Interface() is the most convinence way to get underlying
> > > value in
> > > go.
> > > But it will panic when field is private.How can I access private
> > > field?
> > >
> > > For simple type, I can stil use Int(),Bool(),etc to read private
> > > field.
> > > But if the field is a interface, I do not know how to access is
> > > concrete
> > > value without use Interface() method.
> > >
> > >
> > > For example:
> > >
> > > type Expr interface {
> > > eval(v string) bool
> > > }
> > >
> > > type MyExpr struct {
> > > Haha string
> > > }
> > >
> > >
> > > type Web struct {
> > > Host string
> > > epr Expr
> > > }
> > >
> > >
> > >
> > >
> > > How can I get Web.Epr Value by reflection without use Interface()
> > > method
>
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