[Vuejs]-DateFNS closestIndexTo returns NaN

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So basically dates should be strings in first place. Next probably incorrect place is where you use [_.map(arr, 'date')] which actually place result of map into array making it double array. Also in order to parse arr into Date objects you need map arr values to parseISO function. So following code should work

var closestIndexTo = require('date-fns/closestIndexTo')
var parseISO = require('date-fns/parseISO')
var _ = require('lodash')

val = "2019-10-04"
arrDates = ["2019-09-01","2019-09-03","2019-09-03","2019-09-04","2019-09-05","2019-09-05","2019-09-23","2019-10-01","2019-11-18"]

function getClosestToDate(val, arr) {
  var arrDates = _.map(arr, (a) => parseISO(a))
  var closestDate = closestIndexTo(parseISO(val), arrDates)
  return closestDate
}

console.log("result", getClosestToDate(val, arrDates))

Here is link to repl

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