 ExerciseConfig =
   _exercises: []
   _asyncStatus: null
-  _exerciseCache: []
+  _exerciseCache: {}
   _unsavedExclusions: {}
 
   FAILED: -> console.error('BUG: could not load exercises')

      topic_chapter_section = TocStore.getChapterSection(topic_id)
      _.reject(exercise_ids, (exercise_id) ->
        exercise = cache[exercise_id]
        {section} = getImportantTags(exercise.tags)
        section.toString() is topic_chapter_section.toString()
      )

      @_exerciseCache[exercise_id]

    getTeksString: (exercise_id) ->
      tags = @_exerciseCache[exercise_id]?.tags or []
      teksTags = _.where(tags, {type: EXERCISE_TAGS.TEKS})
      _.map(teksTags, (tag) ->
        tag.name?.replace(/[()]/g, '')
      ).join(" / ")

    getContent: (exercise_id) ->
      @_exerciseCache[exercise_id]?.content.questions[0]?.stem_html

    getTagContent: (tag) ->
      content = getTagName(tag) or tag.id
