How to get series's id in Highcharts / Highstock -

how series's id? in api there name , data etc. don't have id. how id series?

i'm using following way loop series in chart.

$(chart.series).each(function(i, serie){      // want serie's id  }); 

edit:

i found can id using follow way. i'm not sure right way?

 $(chart.series).each(function(i, serie){         console.log(serie.options.id);   }); 

if know id of series can reference series chart.get(id)

if want loop through series , list ids of series, this:

 $(chart.series).each(function(i, serie){console.log(serie.options.id)}) 

fiddle : http://jsfiddle.net/nak9d/2/