Unmarshal Json data in a specific struct

Question

I want to unmarshal the following JSON data in Go:

b := []byte(`{\"Asks\": [[21, 1], [22, 1]] ,\"Bids\": [[20, 1], [19, 1]]}`)

I know how t

Answer 1

You can do this with by implementing the json.Unmarshaler interface on your Order struct. Something like this should do:

func (o *Order) UnmarshalJSON(data []byte) error {
    var v [2]float64
    if err := json.Unmarshal(data, &v); err != nil {
        return err
    }
    o.Price = v[0]
    o.Volume = v[1]
    return nil
}

This basically says that the Order type should be decoded from a 2 element array of floats rather than the default representation for a struct (an object).

You can play around with this example here: http://play.golang.org/p/B35Of8H1e6