how to convert the data from a Pie Chart to a Histogram in Highcharts

HighChart-PieToSeries.js

//Uses Highcharts and Rambda
// live example for conversion => http://goo.gl/I2OdwZ
// jsbin of result

var pieData = [
  { y: 1.242, name: 'EM' }, { y: 29.017, name: 'EM' }, { y: 2.874, name: 'EM' }, { y: 0.474, name: 'EM' }, { y: 33.363, name: 'EM' }, { y: 33.03, name: 'EM' },
  { y: 2.67, name: 'NA' }, { y: 28.551, name: 'NA' }, { y: 2.195, name: 'NA' }, { y: 0.524, name: 'NA' }, { y: 34.131, name: 'NA' }, { y: 31.929, name: 'NA' },
  { y: 0.138, name: 'FE' }, { y: 28.115, name: 'FE' }, { y: 1.576, name: 'FE' }, { y: 0.829, name: 'FE' }, { y: 34.923, name: 'FE' }, { y: 34.419, name: 'FE' },
  { y: 0.547, name: 'GC' }, { y: 25.642, name: 'GC' }, { y: 2.503, name: 'GC' }, { y: 0.398, name: 'GC' }, { y: 35.753, name: 'GC' }, { y: 35.157, name: 'GC' }
];

var histogramData = R.uniq( pieData.map( function ( a ) { return a.name } ) ).map( function ( a ) {
  return {
    name: a,
    series: R.filter( R.propEq( 'name', a ), pieData ).map( function ( a ) { return a.y; } )
  };
} );

//histogramData = [
//  {"name": "EM", "series": [1.242, 29.017, 2.874, 0.474, 33.363, 33.03]},
//  {"name": "NA", "series": [2.67, 28.551, 2.195, 0.524, 34.131, 31.929]},
//  {"name": "FE", "series": [0.138, 28.115, 1.576, 0.829, 34.923, 34.419]},
//  {"name": "GC", "series": [0.547, 25.642, 2.503, 0.398, 35.753, 35.157]}
//];