проверка членов структуры

x := map[string]int{"vasya": 1}
	y, ok := x["some"]
	fmt.Println(y, ok)

0 false

package main

import (
	"fmt"
	"reflect"
)

func HasField(v interface{}, name string) bool {
	return hasField(reflect.ValueOf(v), name)
}

func hasField(v reflect.Value, name string) bool {
	switch v.Type().Kind() {
	case reflect.Ptr:
		return hasField(v.Elem(), name)
	case reflect.Struct:
		_, ok := v.Type().FieldByName(name)
		return ok
	}
	return false
}

func main() {
	type Employee struct {
		ID      int
		Name    string
		Address string
		some    int
	}
	x := Employee{
		Name: "Vasya",
	}
	fmt.Println(HasField(x, "some"))      // true
	fmt.Println(HasField(x, "someOther")) // false
}

package main

import (
	"fmt"
	// "math/rand"
)

func main() {
	type Employee struct {
		ID      int
		Name    string
		Address string
		some    *int
	}
	x := Employee{
		Name: "Vasya",
	}
	// x.some = new(int)
	// *x.some = 42
	if x.some == nil {
		fmt.Println("some unset")
	} else {
		fmt.Printf("some: %d\n", *x.some)
	}

	fmt.Println("")

}