Golang template features (nested variables, range over array, index into map, conditionals)

template.html

  <div class="levels">
    {{ $groups := .LevelGroups }}
    {{ $groupedLevels := .Levels }}
    {{ $completeLevels := .CompleteLevels }}
    {{ if $groupedLevels }}
      {{ range $group := $groups }}
        <div class="intro"><h2>{{$group}}</h2></div>
        {{ range index $groupedLevels $group }}
          <a href="/level/{{.Number}}" class="{{if index $completeLevels .Number}}complete{{end}}">
            <span class="level">{{.Number}} </span>
            {{.Title}}
            <span class="mark-complete">¢</span>
          </a>
        {{end}}
        <br />
      {{ end }}
    {{ end }}
  </div>

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