What is idiomatic way to find if struct field is exported or not?

[Tad Vi]

While reviewing number of popular packages online I noticed different approaches to the same problem:

how to find if struct field is exported or not?

Some use PkgPath and check if it is empty:

// skip unexported fields

if len(f.PkgPath) != 0 {

continue

}

Some check if field is settable something like:

// Don't even bother for unexported fields.

if !v.CanSet() {

return nil

}

Stdlib does not seem to have IsExported() so question is: which way is idiomatic?

[Tim K]

You could check whether the field name starts with an uppercase, but from the godoc PkgPath already does what you want:

// PkgPath is the package path that qualifies a lower case (unexported)
// field name.  It is empty for upper case (exported) field names.
// See https://golang.org/ref/spec#Uniqueness_of_identifiers

CanSet() covers more cases than unexported fields, I would just use PkgPath instead.

[tmaclo...@gmail.com]

if !reflect.ValueOf(strct).Field(i).CanInterface() {
   continue
}

在 2016年4月27日星期三 UTC+8上午3:10:34，Tad Vizbaras写道：