Add json

json/json.go

@@ -0,0 +1,55 @@
+package json
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+)
+
+var f = fmt.Println
+
+type person1 struct {
+	Name string
+	Age  uint
+}
+
+type person2 struct {
+	Name string `json:"name"`
+	Age  uint   `json:"age"`
+}
+
+type person3 struct {
+	Name   string   `json:"name"`
+	Age    uint     `json:"age"`
+	Albums []string `json:"albums"`
+}
+
+func Json() {
+	stringBytes, _ := json.Marshal("foo")
+	f("string =>", string(stringBytes))
+
+	p1Bytes, _ := json.Marshal(&person1{"Abel", 34})
+	f("person1 =>", string(p1Bytes))
+
+	p2Bytes, _ := json.Marshal(&person2{"Abel", 34})
+	f("person2 =>", string(p2Bytes))
+
+	jsonBytes := []byte(`{"name": "Abel", "age": 34, "albums": ["Dawn FM"]}`)
+	pMap := map[string]any{}
+	json.Unmarshal(jsonBytes, &pMap)
+
+	uname := pMap["name"].(string)
+	f("map[name] =>", uname)
+	ualbums := pMap["albums"].([]any)
+	album0 := ualbums[0].(string)
+	f("map[albums][0] =>", album0)
+
+	p3 := &person3{}
+	json.Unmarshal(jsonBytes, &p3)
+
+	f("p3 =>", p3)
+
+	f("Directly writing to stderr:")
+	enc := json.NewEncoder(os.Stderr)
+	enc.Encode(&p3)
+}