Nodejs Utililty Methods Array Object Key

Array.prototype.objectIndex = function(key,value) {
  for(var i = 0, len = this.length; i < len; i++) {
      if (this[i][key] === value) return i;
  return -1;

Array.prototype.options = function(textKey, valueKey) {
  var options = [];
  options = this.map(function(item) {
     return { text: item[textKey], value: item[valueKey] }
  });
  return options;

Array.prototype.updateObject = function (id, key, value_key, value) {
  for (var i = 0; i < this.length; i++) {
    if (this[i][key] == value) {
      return this[i][value_key] = value;
};

Array.prototype.arrToObj = function(){
  var obj = {};
  for (var i = 0; i < this.length; i++) {
    obj[i] = this[i]
  return obj;

Array.prototype.asObject = function(labels) {
  var result = {};
  var _ctx = this;
  labels.each(function(label, idx) {
    if (label != null)
      result[label] = _ctx[idx];
  })
  return result;

Array.prototype.destroy = function(obj){
  var destroyed = null;
  for(var i = 0; i < this.length; i++){
    while(this[i] === obj){
      destroyed = this.splice(i, 1)[0];
  return destroyed;

Array.prototype.fromObject = function (obj) {
    var ar = [];
    for(item in obj){
        ar.push(obj[item]);
    return ar;
};

Array.prototype.getAllObjectsBy = function(field, withValue)
  var results = [];
  for (var i = 0; i < this.length; i++) {
    if(this[i][field] == withValue)
      results.push(this[i]);
  return (results.length>0) ? results : null;

Array.prototype.replace = function(oldObj, newObj){
   var indexOfOldItem = this.indexOf(oldObj)
   if(indexOfOldItem==-1){
      throw new Error("oldObj not in list")
   this[indexOfOldItem] = newObj
   return oldObj
};
Array.prototype._checkIndexInRange = function(index){
...

Array.prototype.seen = function (obj) {
  if (obj.type == 'notification') {
    var i = 0;
    while (this[i].noticeId != obj.noticeId && i < this.length)
      i++;
    return (i < this.length && this[i].seqN < obj.seqN);
  return false;