Better strategy to parse metadata about slides HOT 3 CLOSED

package main

import (
	"encoding/json"
	"fmt"
)

type Meta struct {
	Theme *string `json:"theme"`
}

var meta1 Meta
var meta2 Meta
var meta3 Meta
var meta4 Meta

func printTheme(m *Meta, j string) {
	json.Unmarshal([]byte(j), m)

	if m.Theme == nil {
		fmt.Printf("Theme not set for %s\n", j)
	} else {
		fmt.Printf("Theme is %s for %s\n", *m.Theme, j)
	}
}

func main() {
	printTheme(&meta1, "{}")
	printTheme(&meta2, `{"theme": "dark"}`)
	printTheme(&meta3, `{"theme": ""}`)
	printTheme(&meta4, `{"notATheme": "dark"}`)
}