Dynamically process template map values

I have annotations object like this:

Annotations: map[string]string{
		"common": "Some GPM consistency checkers have failed.",
		"t_0": "Title1",
		"t_1": "Title2",
		"v_0": "V1",
		"v_1": "V2",

I want to print it in table like:

I started something like:

{{ range .Annotations.SortedPairs }}
  {{ if match "^t_" .Name }}
    <p>{{ .Value }}</p>
  {{ end  }}
{{ end }}

but can't really figure out how it should be done. I want to do it dynamically because there can be different number of columns

I think you should add a helper function to your Go template.

var testTemplate *template.Template

func main() {
	var err error
	testTemplate, err = template.ParseFiles("hello.gohtml")
	if err != nil {
		panic(err)
	}

	http.HandleFunc("/", handler)
	http.ListenAndServe(":3000", nil)
}

func handler(w http.ResponseWriter, r *http.Request) {
	data := struct {
		FindValue   func(ann map[string]string, needle string) string
		Annotations map[string]string
	}{
		FindValue,
		map[string]string{
			"common": "Some GPM consistency checkers have failed.",
			"t_0":    "Title1",
			"t_1":    "Title2",
			"v_0":    "V1",
			"v_1":    "V2",
		},
	}
	err := testTemplate.Execute(w, data)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

func FindValue(ann map[string]string, needle string) string {
	var code = strings.Replace(needle, "t_", "", 1)
	for key, val := range ann {
		if key == "v_"+code {
			return val
		}
	}
	return ""
}

then you can use this function in your template like this:

{{ range $key, $value := .Annotations.SortedPairs }}
	   	{{ if match "^t_" .$key }}
	   		<p>{{FindValue ".$key"}}</p>
	   	{{ end  }}
	   	{{ end }}

I hope this helps to you. if there is any problem tell me because I didn't test this code.