Golang golang-json2 (snippet)

Go programming example 'golang-json2'

golang-json2

Golang beginners example: golang-json2

package main

import (
    "bytes"
    "encoding/json"
    "fmt"
    "io"
    "strings"
)

const jsonString = `
    [
        {
            "type": "group",
            "value": [
                "Lorem",
                "Ipsum",
                "dolor",
                "sit",
                "Amet"
            ]
        },
        {
            "type": "value",
            "value": "Hello World"
        },
        {
            "type": "value",
            "value": "foobar"
        }
    ]
`

type Codec interface {
    Encode(w io.Writer, v interface{}) error
    Decode(r io.Reader, v interface{}) error
}

type jsonCodec struct{}

func (*jsonCodec) Encode(w io.Writer, v interface{}) error {
    return json.NewEncoder(w).Encode(v)
}
func (*jsonCodec) Decode(r io.Reader, v interface{}) error {
    return json.NewDecoder(r).Decode(v)
}

func trimByte(str *bytes.Buffer) string {
    return strings.TrimSpace(fmt.Sprint(str))
}

var JSON Codec = (*jsonCodec)(nil)

func main() {
    var m interface{}
    var b bytes.Buffer

    fmt.Printf("INPUT: %s\n", jsonString)

    if err := JSON.Decode(strings.NewReader(jsonString), &m); err == nil {
        fmt.Printf("DECODED: %#v\n", m)
    } else {
        fmt.Println(err)
    }

    if err := JSON.Encode(&b, &m); err == nil {
        fmt.Printf("ENCODED: %s\n", trimByte(&b))
    } else {
        fmt.Println(err)
    }
}

Useful links

• Learn Go: https://golangr.com
• Download Go: https://golang.org