Default value in a struct

/* set default values for a struct being Unmarshaled from json */ package main import ( "encoding/json" "fmt" ) type Out struct { A string `json:"a"` B string `json:"b"` C string `json:"c"` D int `json:"d"` } func main() { in := []byte(`{"a":"1"}`) out := Out{ A: "defaultA", B: "defaultC", C: "defaultD", D: 99, } json.Unmarshal(in, &out) fmt.Printf("%+v\n ", out) }