read insight email store database

gistfile1.txt

var levelup = require('levelup')
var db = levelup('./')
var collection = new Array()
var newCollection = new Array()
var sort_by = function(field, reverse, primer){

   var key = primer ?
       function(x) {return primer(x[field])} :
       function(x) {return x[field]};

   reverse = !reverse ? 1 : -1;

   return function (a, b) {
       return a = key(a), b = key(b), reverse * ((a > b) - (b > a));
     }
}



db.createReadStream()
      .on('data', function(data){
                if (data.key.indexOf("pending-") > -1) {
                        var email =  data.key.replace('pending-','')
                        //var date = new Date(JSON.parse(data.value).created*1000)
                        var json = {email : email.toString(), date : JSON.parse(data.value).created}
                        collection.push(json)
                }
        })
      .on('close', function () {

        collection.sort(sort_by('date',false,parseInt))
        for (item in collection) {
                var date = new Date(collection[item].date*1000)
                var email = collection[item].email
                newCollection.push({email: email, date: date})
        }
        console.log(JSON.stringify(newCollection))
        db.close()
      })