good good study, day day up!

vendor/gopl.io/ch4/movie/main.go

@@ -0,0 +1,104 @@
+// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+
+// See page 108.
+
+// Movie prints Movies as JSON.
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+)
+
+//!+
+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"}},
+	{Title: "Bullitt", Year: 1968, Color: true,
+		Actors: []string{"Steve McQueen", "Jacqueline Bisset"}},
+	// ...
+}
+
+//!-
+
+func main() {
+	{
+		//!+Marshal
+		data, err := json.Marshal(movies)
+		if err != nil {
+			log.Fatalf("JSON marshaling failed: %s", err)
+		}
+		fmt.Printf("%s\n", data)
+		//!-Marshal
+	}
+
+	{
+		//!+MarshalIndent
+		data, err := json.MarshalIndent(movies, "", "    ")
+		if err != nil {
+			log.Fatalf("JSON marshaling failed: %s", err)
+		}
+		fmt.Printf("%s\n", data)
+		//!-MarshalIndent
+
+		//!+Unmarshal
+		var titles []struct{ Title string }
+		if err := json.Unmarshal(data, &titles); err != nil {
+			log.Fatalf("JSON unmarshaling failed: %s", err)
+		}
+		fmt.Println(titles) // "[{Casablanca} {Cool Hand Luke} {Bullitt}]"
+		//!-Unmarshal
+	}
+}
+
+/*
+//!+output
+[{"Title":"Casablanca","released":1942,"Actors":["Humphrey Bogart","Ingr
+id Bergman"]},{"Title":"Cool Hand Luke","released":1967,"color":true,"Ac
+tors":["Paul Newman"]},{"Title":"Bullitt","released":1968,"color":true,"
+Actors":["Steve McQueen","Jacqueline Bisset"]}]
+//!-output
+*/
+
+/*
+//!+indented
+[
+    {
+        "Title": "Casablanca",
+        "released": 1942,
+        "Actors": [
+            "Humphrey Bogart",
+            "Ingrid Bergman"
+        ]
+    },
+    {
+        "Title": "Cool Hand Luke",
+        "released": 1967,
+        "color": true,
+        "Actors": [
+            "Paul Newman"
+        ]
+    },
+    {
+        "Title": "Bullitt",
+        "released": 1968,
+        "color": true,
+        "Actors": [
+            "Steve McQueen",
+            "Jacqueline Bisset"
+        ]
+    }
+]
+//!-indented
+*/