javascript - Use arrays as data sources in timeseries chart C3.js -


i want use arrays sources in c3.js chart this:

var xdata = ['2017-07-28', '2017-07-29']; var ydata = [30, 200];  var chart = c3.generate({     bindto: '#chart',     data: {         x: 'x',         xformat: '%y-%m-%d',         columns: [             ['x', xdata],             ['data1', ydata]         ]     },     axis: {         x: {             type: 'timeseries',             tick: {                 format: '%y-%m-%d'             }         }     } });

but gives me errors like:

failed parse x '2017-07-28,2017-07-29' date object

error: attribute transform: expected number, "translate(nan, 0)".

if use direct values works perfectly:

var chart = c3.generate({     bindto: '#chart',     data: {         x: 'x',         xformat: '%y-%m-%d',         columns: [             ['x', '2017-07-28', '2017-07-29'],             ['data1', 30, 200]         ]     },     axis: {         x: {             type: 'timeseries',             tick: {                 format: '%y-%m-%d'             }         }     } });

in case, 

['x', xdata]

is equal 

['x', ['2017-07-28', '2017-07-29']]

not 

['x', '2017-07-28', '2017-07-29']

what can create array before :

var xdata = ['2017-07-28', '2017-07-29']; var ydata = [30, 200];  xdata.unshift('x'); ydata.unshift('data1');  var chart = c3.generate({      bindto: '#chart',      data: {          x: 'x',          xformat: '%y-%m-%d',          columns: [              xdata,              ydata         ]     },     axis: {         x: {              type: 'timeseries',              tick: {                  format: '%y-%m-%d'              }         }     } });

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