How to use

meanBy

function

in

LoDashStatic

function getVolunteerStatsPerSegment(
 volunteersWithExtras,
 segmentSlug,
 timeScale
) {
 const volunteerGroups = _.groupBy(volunteersWithExtras, ({ createdAt }) =>
  getScaledTimeByTimeScale(timeScale, moment.utc(createdAt))
 )

 return _.mapValues(volunteerGroups, volunteers => {
  return {
   count: volunteers.length,
   onboardedCount: _.filter(
    volunteers,
    ({ availableHours, certificationCount }) =>
     availableHours > 0 && certificationCount > 0
   ).length,
   certificationSum: _.sumBy(volunteers, 'certificationCount'),
   availableHoursAvg: parseInt(_.meanBy(volunteers, 'availableHours'))
  }
 })
}