Go: Nested maps access in a template

main.go

package main

import (
	"log"
	"os"
	"text/template"

)

func main() {

	var urls = map[string]map[string]string{}
	urls["pic1"] = make(map[string]string)
	urls["pic1"]["small"] = "pic1-small-url"
	urls["pic1"]["large"] = "pic1-large-url"

	urls["pic2"] = make(map[string]string)
	urls["pic2"]["small"] = "pic2-small-url"
	urls["pic2"]["large"] = "pic2-large-url"

	urls["pic3"] = make(map[string]string)
	urls["pic3"]["small"] = "pic3-small-url"
	urls["pic3"]["large"] = "pic3-large-url"

	tpl := template.Must(template.New("content").Parse(`
		{{.small}} - {{.large}}
	`))

	for _, r := range urls {
		err := tpl.Execute(os.Stdout, r)
		if err != nil {
			log.Printf("%s\n", err.Error())
		}
	}
  
  /* output:
  pic1-small-url - pic1-large-url
	
  pic2-small-url - pic2-large-url
	
	pic3-small-url - pic3-large-url
  */
}