Bulk Process of large arrays in Javascript

bulker.js

module.exports=function(array,bulkSize,job){

  if (!array) throw new Error('Array is not specified');
  if (!job) throw new Error('Must define the job');

  var i = 0;
  var j = array.length;
  var chunkArr = []; // this keeps the chunk values
  var chunk=bulkSize || 500000; // default value is half a million

  var looper = function () {
    job(array.slice(i, i + chunk),function(processReport){
      i += chunk;
      if (i < j) {
        processReport(parseInt((i/j)*100));
        looper();
      } else {
        processReport(100);
      }
    });
  }; // end lo
  // init looper
  looper();
};