Empty array [] is decoded to nil

[itchyny]

It seems that [] in value is decoded to []interface{}(nil) but I expect []interface{}{}

Sample code

package main

import (
    "encoding/json"
    "fmt"

    "github.com/iancoleman/orderedmap"
)

func main() {
    src := []byte(`{"x":[]}`)

    var m interface{}
    json.Unmarshal(src, &m)
    fmt.Printf("%#v\n", m)
    bs, _ := json.Marshal(m)
    fmt.Printf("%s\n", string(bs))

    om := orderedmap.New()
    json.Unmarshal(src, om)
    fmt.Printf("%#v\n", om)
    bs, _ = json.Marshal(om)
    fmt.Printf("%s\n", string(bs))
}

Actual behavior

map[string]interface {}{"x":[]interface {}{}}
{"x":[]}
&orderedmap.OrderedMap{keys:[]string{"x"}, values:map[string]interface {}{"x":[]interface {}(nil)}}
{"x":null}

Expected behavior

map[string]interface {}{"x":[]interface {}{}}
{"x":[]}
&orderedmap.OrderedMap{keys:[]string{"x"}, values:map[string]interface {}{"x":[]interface {}{}}
{"x":[]}

[iancoleman]

Good find, thanks for reporting this.

[iancoleman]

• Test: https://github.com/iancoleman/orderedmap/commit/d5970f2fea022956e84fb116cff5677107fd7e33
• Fix: https://github.com/iancoleman/orderedmap/commit/d6d18c00013783872b94137d6bb90dc89eee9863

[itchyny]

It works fine! Thank you.