Nodejs Utililty Methods Array Push

Array.prototype.pushFront = function(value) {
  for(var i = this.length; i>0; i--){
    this[i] = this[i-1];
  this[0] = value;
array = [1,2,3,4,5];
array.pushFront(0);
array.pushFront("Hello");
...

Array.prototype.akaPush=function(value){
  var len = this.length;
  this[len] = value;
  len++;
  this.length = len;
  return len;

'use strict';
Array.prototype.cutAndPush = function(f,xs) {
  var i = 0;
  while (i < this.length) {
    if (f(this[i])) {
      xs.push(this[i]);
      this.splice(i,1);
    } else {
      i++;
...

Array.prototype.pushArrayIfNotExist = function(element) { 
  if (!this.ifArrayInArray (element)) {
    this.push(element);
};

Array.prototype.pushRange = function (_items) {
    for (var l = 0; l < _items.length; l++) {
        this.push(_items[l]);
};

Array.prototype.pushRange = function(arr) {
    this.push.apply(this, arr);
};

Array.prototype.pushString = function(str) {
  let data = encodeString(str);
  let ii = 0;
  let length = data.length;
  for (; ii < length; ++ii) {
    this.push(data[ii]);
  };
  return void 0;

Array.prototype.pushTab = function(tab) {
  this.pushIfNotExist(tab, function(t) 
    {return t.title === tab.title && t.url === tab.url;});  
};