go_workshop/chapter_07/exercise_7.03/main.go

package main

import "fmt"

type record struct {
  key       string
  valueType string
  data      interface{}
}

type person struct {
  lastName  string
  age       int
  isMarried bool
}

type animal struct {
  name     string
  category string
}

func newRecord(key string, i interface{}) record {

  r := record{}
  r.key = key

  switch v := i.(type) {
  case int:
    r.valueType = "int"
    r.data = v
  case bool:
    r.valueType = "bool"
    r.data = v
  case string:
    r.valueType = "string"
    r.data = v
  case person:
    r.valueType = "person"
    r.data = v
  default:
    r.valueType = "unknown"
    r.data = v
  }
  return r

}

func main() {

  m := make(map[string]interface{})
  a := animal{name: "oreo", category: "cat"}
  p := person{lastName: "Doe", isMarried: false, age: 19}
  m["person"] = p
  m["animal"] = a
  m["age"] = 54
  m["isMarried"] = true
  m["lastName"] = "Smith"

  rs := []record{}
  for k, v := range m {
    r := newRecord(k, v)
    rs = append(rs, r)
  }

  for _, v := range rs {
    fmt.Println("Key:", v.key)
    fmt.Println("Data:", v.data)
    fmt.Println("Type:", v.valueType)
    fmt.Println()
  }

}