stuff.go

type part struct {
	Type       string            `json:type`
	Args       map[string]string `json:args`
	Properties map[string]string `json:properties`
}

type binFunc func(interface{})

stuff := map[string]binFunc{}

for _, p := range jsonParts.Parts {
	fmt.Println(p)
	stuff[p.Type] = func(data interface{}) {
		fmt.Println(p.Args)
		fmt.Println(p.Properties)
	}
}

for k, t := range stuff {
	fmt.Println(k)
	t(nil)
}