marshal Go to JSON

👍 vi movie.go    
👍 go run movie.go
[
  {
    "Title": "Casablanca",
    "released": 1942,
    "Actors": [
      "Humphrey Bogart",
      "Ingrid Bergman"
    ]
  },
  {
    "Title": "Cool Hand Luke",
    "released": 1967,
    "color": true,
    "Actors": [
      "Paul Newman"
    ]
  }
]
[{Casablanca} {Cool Hand Luke}]

👍 cat movie.go 
package main

import (
  "encoding/json"
  "log"
  "fmt"
)

type Movie struct {
  Title string
  Year int `json:"released"`
  Color bool `json:"color,omitempty"`
  Actors []string
}

var movies = []Movie{
  {Title: "Casablanca", Year: 1942,
     Color: false, Actors: []string{
     "Humphrey Bogart", 
     "Ingrid Bergman"}},
  {Title: "Cool Hand Luke", Year: 1967,
     Color: true, Actors: []string{
     "Paul Newman"}},
}

func main() {
  data, err := json.MarshalIndent(
    movies, "", "  ")
  if err != nil {
    log.Fatalf(
      "JSON marshaling failed: %s", err)
  }
  fmt.Printf("%s\n", data)

  var titles []struct{ 
    Title string
//    Actors []string
  }
  if err := json.Unmarshal(
    data, &titles); err != nil {
    log.Fatalf(
      "JSON unmarshaling failed: %s",err)
  }
  fmt.Println(titles) 
}

    

ch4.5 JSON p108/127 of