How to use

mean

function

in

LoDashStatic

function calculateCycleTimeChartData(stories, dateRange) {
 var data = 'Data.CycleTimeChart = [\n';
 var cycleTimes = [];

 _.each(dateRange, function (day) {
  _.each(stories, function (story) {
   if (story.completed_at.split('T')[0] === day) {
    var cycleTime = (new Date(story.completed_at).getTime() - new Date(story.started_at).getTime()) / MILLISECONDS_IN_A_DAY;

    cycleTimes.push(cycleTime);
   }
  });

  if (day.split('-')[2] === '01') {
   data += '  [new Date("' + day + '"), ' + _.max(cycleTimes) + ', ' + _.mean(cycleTimes) + ', ' + _.min(cycleTimes) + '],\n';
   cycleTimes = [];
  }
 });

 data += '];\n';

 return data;
}

calcProbableValue(values) {
  let itemIndex
  while (values.length > 2) {
   const avg = _.mean(values)
   const min = _.min(values)
   const max = _.max(values)
   if ((min + max) / 2 === avg) {
    return avg
   }
   let maxDeviation = 0
   _.forEach(values, (value, i) => {
    const deviation = Math.abs(value - avg)
    if (deviation > maxDeviation) {
     maxDeviation = deviation
     itemIndex = i
    }
   })
   values.splice(itemIndex, 1)
  }
  return parseInt(_.mean(values))
 }