Nodejs Utililty Methods Array Delete by Index

Array.prototype.delete = function() { 
    var arr = this;
    var todel = arguments[0];
    if(todel && todel instanceof Array) {
        var arraux = [];
        for(var i=0; i<todel.length;i++) {
            arr.some(function(el, j){
                if(el == todel[i]){
                    arraux.push(j+'');
...

'use strict';
Array.prototype.delete = function (index) {
    delete this[index];
    this.splice(index, 1);
    return this;
};

Array.prototype.deleteAll = function(){
  var arr = this;
  arr.splice(0,arr.length);

Array.prototype.deleteAt = function(index) {
  return this.splice(index, 1);
};

Array.prototype.deleteItems = function (ids, filterEmpty = true) {
    var result = this.slice();
    if (typeof ids === 'object' && ids.constructor === [].constructor) {
        ids.sort(function (a, b) {
            return b > a;
        }).forEach(function (value) {
            if (filterEmpty) {
                result.splice(value, 1);
            } else {
...

Array.prototype.delete_at = function(from, to) {
  var rest = this.slice((to || from) + 1 || this.length);
  this.length = from < 0 ? this.length + from : from;
  return this.push.apply(this, rest);
Array.prototype.delete_if = function(matcher){
  for(var i = 0; i < this.length; i++){
    if(matcher(this[i])) {
      this.delete_at(i)
...