Don't know how to make 'X' simple, but you can use a strategy like
https://play.golang.org/p/n4ms3hNGgy which at least minimizes allocations
by only Unmarshal'ing the k:v pairs of interest.
On Tuesday, December 20, 2016 at 8:48:03 AM UTC-7, Alexander Petrovsky
wrote:
>
> Hello!
>
> By example I have follow json {a:1, b:2, c:str, d:123, ..., z99: 1, z100:
> 10}, suppose it's veeery big json, and I don't need the whole fields in my
> little struct:
>
> Struct {
> a int `json:"a"`
> y int `json:"y"`
> }
>
> What I want? I want smart unmarshaler that can unmarshal my json to
> struct, and the other KVs (without 'a' and 'y' fields) put (by example) to
> some additional variable X. After some machinery I want to marshal data
> back my struct fields and payload from X. How can I do it the most
> effective?
>
> Right now I use map[string]interface{}, but it affetcs my application
> latency due it causes many GC.
>
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