json _ golang

package main
import (
 "encoding/json"
 "fmt"
 "os"
)
type Response1 struct {
 Page int
 Fruits []string
}
type Response2 struct {
 Page int `json:"page"`
 Fruits []string `json:"fruits"`
}
func main() {
 bolB, _ := json.Marshal(true)
 fmt.Println(string(bolB))
 intB, _ := json.Marshal(1)
 fmt.Println(string(intB))
 fltB, _ := json.Marshal(2.34)
 fmt.Println(string(fltB))
 strB, _ := json.Marshal("gopher")
 fmt.Println(string(strB))
 slcD := []string{"apple", "peach", "pear"}
 slcB, _ := json.Marshal(slcD)
 fmt.Println(string(slcB))
 mapD := map[string]int{"apple": 5, "letture": 7}
 mapB, _ := json.Marshal(mapD)
 fmt.Println(string(mapB))
 res1D := &Response1{
 Page: 1,
 Fruits: []string{"apple", "peach", "pear"}}
 res1B, _ := json.Marshal(res1D)
 fmt.Println(string(res1B))
 res2D := &Response2{
 Page: 1,
 Fruits: []string{"apple", "peach", "pear"}}
 res2B, _ := json.Marshal(res2D)
 fmt.Println(string(res2B))
 byt := []byte(`{"num":6.13,"strs":["a", "b"]}`)
 var dat map[string]interface{}
 if err := json.Unmarshal(byt, &dat); err != nil {
 panic(err)
 }
 fmt.Println(dat)
 num := dat["num"].(float64)
 fmt.Println(num)
 strs := dat["strs"].([]interface{})
 str1 := strs[0].(string)
 fmt.Println(str1)
 str := `{"page": 1, "fruits": ["apple", "peach"]}`
 res := &Response2{}
 json.Unmarshal([]byte(str), &res)
 fmt.Println(res)
 fmt.Println(res.Fruits[0])
 enc := json.NewEncoder(os.Stdout)
 d := map[string]int{"apple": 5, "lettuce": 7}
 enc.Encode(d)
}

true
1
2.34
"gopher"
["apple","peach","pear"]
{"apple":5,"letture":7}
{"Page":1,"Fruits":["apple","peach","pear"]}
{"page":1,"fruits":["apple","peach","pear"]}
map[num:6.13 strs:[a b]]
6.13
a
&{1 [apple peach]}
apple
{"apple":5,"lettuce":7}

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