func of count runes of string about frep HOT 5 CLOSED

func Join(separator string, value []interface{}) string {
	defer func() {
		recover()
	}()

	sb := &strings.Builder{}
	for i, v := range value {
		_, _ = fmt.Fprintf(sb, "%v", v)
		if i != len(value)-1 {
			_, _ = fmt.Fprintf(sb, separator)
		}
	}
	return sb.String()
}

{{ .foo | join "," }}