nearest-date/index.js

Given an array of dates, this module will find the date nearest to a given target date. Can be used to find the nearest number as well

'use strict'

module.exports = function (dates, target) {
  if (!target) target = Date.now()
  else if (target instanceof Date) target = target.getTime()

  var nearest = Infinity
  var winner = -1

  dates.forEach(function (date, index) {
    if (date instanceof Date) date = date.getTime()
    var distance = Math.abs(date - target)
    if (distance < nearest) {
      nearest = distance
      winner = index
    }
  })

  return winner
}