easonlin404 / go-cookbook

go-cookbook

• Convert GO struct to JSON
• Convert JSON to GO struct
• Pass slice as a function argument

Question

• Composition in Go
• Interface in Go
• Append slice

Convert GO struct to JSON

See the example code.

package main

import (
	"encoding/json"
	"fmt"
)

type Person struct {
	Name string `json:"name"`
	Age  int    `json:"age"`
}

func main() {
	p := &Person{
		Name: "Eason",
		Age:  10,
	}
	b, err := json.Marshal(p)
	if err != nil {
		panic(err)
	}

	fmt.Println(string(b))
}

Convert JSON to GO struct

See the example code.

package main

import (
	"encoding/json"
	"fmt"
)

func main() {
	byt := []byte(`{"name":"eason"}`)
	var data map[string]interface{}

	if err := json.Unmarshal(byt, &data); err != nil {
		fmt.Printf("Error: %s\n", err)
	}

	fmt.Printf("data: %v\n", data)
}

Pass slice as a function argument

See the example code.

package main

import (
	"fmt"
)

func main() {
	s := []int{1, 2, 3}
	appendSlice(s)
	fmt.Println(s)

	modifySlice(s)
	fmt.Println(s)
}

func appendSlice(s []int) {
	s = append(s, 4)
}

func modifySlice(s []int) {
	s[0] = 0
}