Nodejs Utililty Methods Array Filter

Array.prototype.filter = function (fun) {
    var len = this.length;
    var res = [];
    var thisArg = void 0;
    for (var i = 0; i < len; i++) {
        var val = this[i];
        if (fun.call(thisArg, val)) {
            res.push(val);
    return res;
};

Array.prototype.filter = function(fun) {
  "use strict";
  var i, len, res, t, thisArg, val;
  if (this === void 0 || this === null) {
    throw new TypeError();
  t = Object(this);
  len = t.length >>> 0;
  if (typeof fun !== "function") {
...

Array.prototype.filter = function(fun, thisp) {
  "use strict";
  if (this === void 0 || this === null) {
    throw new TypeError();
  var t = Object(this);
  var len = t.length >>> 0;
  if (typeof fun !== "function") {
    throw new TypeError();
...

Array.prototype.filter = function(func) {
    var result = [];
    for(var i=0;i<this.length;i++) 
        if (func(this[i]))
            result.push(this[i]);
    return result;

var school = [1, 2, 3, 4, 5, 6, 7, 8, 3, 35, 3, 5];
Array.prototype.filter = function(grade) {
  var result = [];
  this.forEach(function(item) {
    if (grade(item)) {
      result.push(item);
  });
  return result;
...

const array = [1, 42, 7, 9, 13, 10, 20, 35, 45, -7, -3, 0, 4, -1, 15];
Array.prototype.filter = function (isOk) {
  let filteredArray = [];
  const len = this.length;
  for (let i = 0; i < len; i += 1) {
    if(isOk(this[i], i, this)) {
      filteredArray.push(this[i]);
  return filteredArray;
};

Array.prototype.filter = function(iterator) {
  var results = [];
  for (var i = 0, len = this.length; i < len; i++) {
    if (iterator(this[i], i)) {
      results.push(this[i]);
  return results;
};
...

Array.prototype.filter = function(predicate) {
  var result = []
  for ( var i = 0; i < this.length; i++) {
    if (predicate(this[i])) {
      result.push(this[i]);
  return result;

Array.prototype.filter = function(predicate){
  return this.reduce(function(accumulator, value){
    return predicate(value) ? accumulator.concat(value) : accumulator;
  }, []);
console.log([1, 2, 3, 4, 5].filter(function(val){
  return val % 2 === 0; 
}));

Array.prototype.filter = function (predicate) {
    let result = [];
    this.forEach(item => {
        if (predicate(item)) {
            result.push(item);
    })
    return result;
};
...