                 break
         @
 
-    # Mark a given data series as hidden. Mutates the data.
+    # Mark a given data series as hidden.
     hide: (keys, flag = true)->
         metadata = chart.metadata()
         if not (keys instanceof Array)


        @

    # Un-hide data series.  Mutates the data.
    show: (keys)->
        @hide keys, false

    # Flip data series on/off.  Mutates the data.
    toggle: (keys)->
        metadata = chart.metadata()
        if not (keys instanceof Array)


        @

    # Turn everything off except for the given data series.
    showOnly: (key)->
        metadata = chart.metadata()
        for d in data
