c1-m4-marshal a map

c1-m4-activity/makejson.go

@@ -0,0 +1,39 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+)
+
+var name, address string
+
+/**
+* Zero value of a map: https://tour.golang.org/moretypes/19
+* A nil map has no keys, nor can keys be added.
+*  var addressBook map[string]string
+**/
+
+// AddressBook alias map type
+type AddressBook map[string]string
+
+func main() {
+	// The make function returns a map of the given type, initialized and ready for use.
+	addressBook := make(AddressBook)
+	fmt.Printf("Please enter name: \n")
+	fmt.Scan(&name)
+	fmt.Printf("Please enter address: \n")
+	fmt.Scan(&address)
+	addressBook[name] = address
+	barr, err := json.Marshal(addressBook)
+	if err != nil {
+		fmt.Printf("Can't create json" + err.Error())
+	}
+	fmt.Println("-----")
+	fmt.Printf("Original Object: %v\n", addressBook)
+	fmt.Printf("Json Object: %v\n", barr)
+
+	// unmarshallAddressBook := make(AddressBook)
+	// err = json.Unmarshal(barr, &unmarshallAddressBook)
+	// fmt.Printf("Unmarshal Object: %v\n", unmarshallAddressBook)
+	fmt.Println("-----")
+}