good night

20_struct/04_method-sets/01_value-receiver/main.go

@@ -0,0 +1,29 @@
+package main
+
+import "fmt"
+
+type person struct {
+	first string
+	last string
+	age   int
+}
+
+func (p *person) fullName() string {
+	fmt.Printf("Inside method:  %p\n", &p)
+	return p.first + p.last
+}
+
+func main() {
+	p1 := person{"James", "Bond", 20}
+	p2 := &person{"Miss", "Moneypenny", 18}
+
+	// address in main is different from address in method
+	fmt.Println(p1.fullName())
+	fmt.Printf("Inside main: %p\n", &p1)
+
+	// method works for either a value or pointer
+	fmt.Println(p2.fullName())
+}
+
+// p1 is the receiver value for the call to fullName
+// fullName is operating on its own value of p1

20_struct/08_marshal_unmarshal/01_marshal/01_exported/main.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+)
+
+type Person struct {
+	First       string
+	Last        string
+	Age         int
+	notExported int
+}
+
+func main() {
+	p1 := Person{"James", "Bond", 20, 007}
+	bs, _ := json.Marshal(p1)
+	fmt.Println(bs)
+	fmt.Printf("%T \n", bs)
+	fmt.Println(string(bs))
+}

20_struct/08_marshal_unmarshal/01_marshal/02_unexported/main.go

@@ -0,0 +1,19 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+)
+
+type Person struct {
+	first string
+	last  string
+	age   int
+}
+
+func main() {
+	p1 := Person{"James", "Bond", 20}
+	fmt.Println(p1)
+	bs, _ := json.Marshal(p1)
+	fmt.Println(string(bs))
+}

20_struct/08_marshal_unmarshal/01_marshal/03_tags/main.go

@@ -0,0 +1,18 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+)
+
+type Person struct {
+	First string
+	Last  string `json:"-"`
+	Age   int    `json:"wisdom score"`
+}
+
+func main() {
+	p1 := Person{"James", "Bond", 20}
+	bs, _ := json.Marshal(p1)
+	fmt.Println(string(bs))
+}

20_struct/08_marshal_unmarshal/02_unmarshal/01/main.go

@@ -0,0 +1,29 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+)
+
+type Person struct {
+	First       string
+	Last        string
+	Age         int
+}
+
+func main() {
+	var p1 Person
+	fmt.Println(p1.First)
+	fmt.Println(p1.Last)
+	fmt.Println(p1.Age)
+
+	bs := []byte(`{"First":"James", "Last":"Bond", "Age":20}`)
+	json.Unmarshal(bs, &p1)
+
+
+	fmt.Println("--------------")
+	fmt.Println(p1.First)
+	fmt.Println(p1.Last)
+	fmt.Println(p1.Age)
+	fmt.Printf("%T \n", p1)
+}

20_struct/08_marshal_unmarshal/02_unmarshal/02_tags/main.go

@@ -0,0 +1,28 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+)
+
+type Person struct {
+	First string
+	Last  string
+	Age   int `json:"wisdom score"`
+}
+
+func main() {
+	var p1 Person
+	fmt.Println(p1.First)
+	fmt.Println(p1.Last)
+	fmt.Println(p1.Age)
+
+	bs := []byte(`{"First":"James", "Last":"Bond", "wisdom score":20}`)
+	json.Unmarshal(bs, &p1)
+
+	fmt.Println("--------------")
+	fmt.Println(p1.First)
+	fmt.Println(p1.Last)
+	fmt.Println(p1.Age)
+	fmt.Printf("%T \n", p1)
+}

20_struct/09_encode_decode/01_encode/main.go

@@ -0,0 +1,18 @@
+package main
+
+import (
+	"encoding/json"
+	"os"
+)
+
+type Person struct {
+	First       string
+	Last        string
+	Age         int
+	notExported int
+}
+
+func main() {
+	p1 := Person{"James", "Bond", 20, 007}
+	json.NewEncoder(os.Stdout).Encode(p1)
+}

20_struct/09_encode_decode/02_decode/main.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"encoding/json"
+	"strings"
+	"fmt"
+)
+
+type Person struct {
+	First       string
+	Last        string
+	Age         int
+	notExported int
+}
+
+func main() {
+	var p1 Person
+	str := strings.NewReader(`{"First":"James", "Last":"Bond", "Age":20}`)
+	json.NewDecoder(str).Decode(&p1)
+
+	fmt.Println(p1.First)
+	fmt.Println(p1.Last)
+	fmt.Println(p1.Age)
+}