How do you loop through the fields in a Golang struct to get and set values in an extensible way?

Question

I have a struct Person.

type Person struct {
    Firstname string       
    Lastname  string       
    Years     uint8       
}

Then I have t

Answer 1

Use reflect.ValueOf() to convert to concrete type. After that you could use reflect.Value.SetString to set the value you want.

structValue := FooBar{Foo: "foo", Bar: 10}
fields := reflect.TypeOf(structValue)
values := reflect.ValueOf(structValue)

num := fields.NumField()

for i := 0; i < num; i++ {
    field := fields.Field(i)
    value := values.Field(i)
    fmt.Print("Type:", field.Type, ",", field.Name, "=", value, "\n")

    switch value.Kind() {
    case reflect.String:
        v := value.String()
        fmt.Print(v, "\n")
    case reflect.Int:
        v := strconv.FormatInt(value.Int(), 10)
        fmt.Print(v, "\n")
    case reflect.Int32:
        v := strconv.FormatInt(value.Int(), 10)
        fmt.Print(v, "\n")
    case reflect.Int64:
        v := strconv.FormatInt(value.Int(), 10)
        fmt.Print(v, "\n")
    default:
        assert.Fail(t, "Not support type of struct")
    }
}