Serialize shmerialize

main.go

package main

import (
	"encoding/json"
	"fmt"
)

type Cat struct {
	Angry    bool `json:"angry"`
	Declawed bool `json:"declawed"`
}

type CatThreatAssessment struct {
	Cat
	IsDangerous bool `json:"is_dangerous"`
}

func NewCatThreatAssessment(c Cat) CatThreatAssessment {
	return CatThreatAssessment{
		Cat:         c,
		IsDangerous: c.Angry && !c.Declawed,
	}
}

func main() {
	dangerousCat := Cat{Angry: true, Declawed: false}
	justAngryCat := Cat{Angry: true, Declawed: true}

	dcj, _ := json.MarshalIndent(NewCatThreatAssessment(dangerousCat), "", "  ")
	jacj, _ := json.MarshalIndent(NewCatThreatAssessment(justAngryCat), "", "  ")

	fmt.Printf("dangerousCat JSON:\n%v\n", string(dcj))
	fmt.Printf("justAngryCat JSON:\n%v\n", string(jacj))
}

Output:

dangerousCat JSON:
{
  "angry": true,
  "declawed": false,
  "is_dangerous": true
}
justAngryCat JSON:
{
  "angry": true,
  "declawed": true,
  "is_dangerous": false
}