Nodejs Utililty Methods Array Merge

Array.prototype.merge = function( key, array ){
  for( var i = 0; i < this.length; i++)
    for(var j = 0; j < array.length; j++)
      if( this[i][key] == array[j][key]) {
        for( var property in array[j] )
          if( array[j].hasOwnProperty( property) && property != key)
...

Array.prototype.merge = function() {
  var l = this.length, a = [];
  for (var i=0; i<l; i++) {
    var k = this[i].length;
    for (var j=0; j<k; j++) {
      a.push(this[i][j]);
  return a;
...

Array.prototype.merge = function(arr) {
    if (arr) {
        for (var i = 0; i < arr.length; ++i) {
            if (!this.contains(arr[i]))
                this.push(arr[i]);

Array.prototype.merge = function (arr) {
    if (arr == null || typeof(arr) == "undefined") {
        return this;
    return this.concat(arr);
};

Array.prototype.merge = function(arra){
    var oneArra = this;
    var twoArra = arra;
    var oneIndex = 0;
    var twoIndex = 0;
    var result = [];
    while(!(oneIndex == oneArra.length && twoIndex == twoArra.length)){
        if((oneArra[oneIndex] < twoArra[twoIndex]) || (twoIndex == twoArra.length)){
            result[result.length] = oneArra[oneIndex];
...

Array.prototype.merge = function(arrayB) {
    var arrayA = this.valueOf(), res = [], bCopy;
    res = arrayA.unite([]);
    bCopy = arrayB.unite([]);
    for (var i = 0; i < res.length; i++) {
        for (var j = 0; j < arrayB.length; j++) {
            if (res[i] == bCopy[j]) {
                delete bCopy[j];
                break;
...

Array.prototype.merge = function(list){
    var merged = [];
    function hasnotAdded(element, index, array) {
        if(merged.some(function(e){ return e.title === element.title;})){
            return false;
        else {
            merged.push(element);
            return true;
...

Array.prototype.merge = function(other) {
    var that = this;
    other.forEach(function(el2) {
        if (that.every(function(el1) {
            return el1 !== el2;
        })) {
            that.push(el2);
    });
...

Array.prototype.merge = function(secondArray){
  for (var element in secondArray){
    if(this.contains(secondArray[element])){
      continue;
    this.push(secondArray[element]);

Array.prototype.merge = function (targets, comparer, builder) {
  return this.map(function (source) {
    var target = targets.filter(function (x) { return comparer(source, x); })[0];
    return builder(source, target);
  });
};