nulltype

Installation

$ go get -u github.com/r-fujiyama/nulltype

Example

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

	"github.com/r-fujiyama/nulltype"
)

func main() {
	// JSON Encode
	s1 := nulltype.String{String: "foo", Valid: true}
	var buf bytes.Buffer
	_ = json.NewEncoder(&buf).Encode(s1)
	fmt.Print(buf.String()) // "foo"

	buf.Reset()
	s1 = nulltype.String{String: "", Valid: true}
	_ = json.NewEncoder(&buf).Encode(s1)
	fmt.Print(buf.String()) // ""

	buf.Reset()
	s1 = nulltype.String{String: "", Valid: false}
	_ = json.NewEncoder(&buf).Encode(s1)
	fmt.Print(buf.String()) // null

	// JSON Decode
	s2 := nulltype.String{}
	_ = json.NewDecoder(strings.NewReader(`"foo"`)).Decode(&s2)
	fmt.Printf("%#v\n", s2) // nulltype.String{String:"foo", Valid:true}

	_ = json.NewDecoder(strings.NewReader(`""`)).Decode(&s2)
	fmt.Printf("%#v\n", s2) // nulltype.String{String:"", Valid:true}

	_ = json.NewDecoder(strings.NewReader("null")).Decode(&s2)
	fmt.Printf("%#v\n", s2) // nulltype.String{String:"", Valid:false}
}

License

MIT