package main

import "fmt"

func getData() []interface{} {

  return []interface{}{
    1,
    3.14,
    "hello",
    true,
    struct{}{},
  }

}

func typeCheck(v interface{}) string {

  switch v.(type) {
  case string:
    return "string"
  case bool:
    return "bool"
  case float32, float64:
    return "float"
  case int, int32, int64:
    return "int"
  default:
    return "unknown"
  }

}

func main() {

  data := getData()
  for i := 0; i < len(data); i++ {
    fmt.Printf("%v is %v\n", data[i], typeCheck(data[i]))
  }

}