package encoding/json
Float64 returns the number as a float64.
Golang encoding/json.Number.Float64 function usage example
func (j *Json) Float64() (float64, error) {
switch j.data.(type) {
case json.Number:
return j.data.(json.Number).Float64() // <---- here
case float32, float64:
return reflect.ValueOf(j.data).Float(), nil
case int, int8, int16, int32, int64:
return float64(reflect.ValueOf(j.data).Int()), nil
case uint, uint8, uint16, uint32, uint64:
return float64(reflect.ValueOf(j.data).Uint()), nil
}
return 0, errors.New("invalid value type")
}
Reference :
http://golang.org/pkg/encoding/json/#Number.Float64
