Using a Go struct to shadow a JS Object

objtest.go

package main

//go:generate gopherjs build --minify

import (
	"crypto/sha256"

	"github.com/gopherjs/gopherjs/js"
)

func main() {
	js.Module.Get("exports").Set("hashobj", hashobj)
}

type UserInfo struct {
	*js.Object
	Name    string `js:"name"`
	Address string `js:"address"`
	City    string `js:"city"`
	State   string `js:"state"`
	Hash    []byte `js:"hash"`
}

func hashobj(obj *js.Object) *js.Object {
	// Get a UserInfo from the passed-in object
	ui := &UserInfo{Object: obj}

	h := sha256.New()
	h.Write([]byte(ui.Name))
	h.Write([]byte(ui.Address))
	h.Write([]byte(ui.City))
	ui.Hash = h.Sum(nil)
	return ui.Object
}