Nodejs Utililty Methods Array Get Object

Array.prototype.getById = function(id) {
    for(var i=0; i<this.length; i++) {
        if(this[i]._id == id) {
            return this[i];

Array.prototype.getByKey = function(aName) {
    for(var i = this.length-1; i >= 0; i--)
        if(this[i].getKey() === aName)
            return this[i];
    return null;
};

Array.prototype.getEach = function(code){
    var rev = [];
    for(var i = 0 ; i < this.length ; i++){
        rev.push(this[i][code]);
    return rev;
};

Array.prototype.getFrequency=function(){
    this.sort()
    var count=0
    var max={
        val:0,
        num:0
    for (var i =1;i<this.length;i++){
        if(this[i]===""){
...

Array.prototype.getIndex=function(a){
  var index=-1;
  for(var i=0;i<this.length;i++){
    if(this[i]==a){
      index=i;
      break;
  return index;
...

'use strict';
Array.prototype.getIndexBy = function (name, value) {
  for (var i = 0; i < this.length; i++) {
    if (this[i][name] === value) {
      return i;
};

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

angular
    .module('app', [
        'angular.filter',
        'ui.router',
        'ngAnimate',
        'ngMaterial',
        'user',
        'login',
        'register',
...

Array.prototype.getIndexByKey = function(name) {
  for (var i = 0; i < this.length; i++) {
    if (this[i][name]) {
      return i;
  return -1;

Array.prototype.getIndexByVal=function(key,val){
    for (var i in this){
        if(this[i].hasOwnProperty(key)){
            if(this[i][key]===val){
                return i
    return false
...