How to correctly use jQuery extend

How to correctly use jQuery extend

By : user3100005
Date : January 11 2021, 05:14 PM
should help you out From Jquery docs
code :
var a = {a:{b:[1,2,3],c:"a",d:"a"},b:"aaa"}
var b = {a:{b:[],c:""},b:"b"}

function deepMerge(a = {}, b = {}) {
  for (let key in a)
    typeof a[key] === 'object' && !Array.isArray(a[key])
      ? deepMerge(a[key], b[key]) 
      : a[key] = b[key] === undefined 
        ? a[key] 
        : b[key]
  return a

deepMerge(a, b)


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JQuery $.extend doesn't work like I would expect: How to code this correctly?

JQuery $.extend doesn't work like I would expect: How to code this correctly?

By : RobSwiger
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , I'm not sure if you noticed it, but the $.extend() function is intended for properties of objects, not elements of an array.
It seems like you need to create a function to loop through the arrays, and call $.extend() on matching elements to get your desired result. You would have to decide whether you want to add or ignore non-matching elements from the second array.
jquery extend method (extend order)

jquery extend method (extend order)

By : user2184034
Date : March 29 2020, 07:55 AM
Does that help You can create the initial buttons as an array, then you can use .unshift() to insert the new button at the beginning of the array like
code :
var btns = dialog.dialog('option', 'buttons');
    text: "New Button",
    click: function () {
dialog.dialog('option', 'buttons', btns);
Backbone/View JQuery Issues - _.extend is not a function, Cannot read property 'extend' of undefined

Backbone/View JQuery Issues - _.extend is not a function, Cannot read property 'extend' of undefined

By : Łukasz Wyżykowski
Date : March 29 2020, 07:55 AM
Hope that helps So this can happen depending on how you use require to load scripts. require will load files asynchronously whenever possible, unless you define dependencies.
Your code as written seems to be running into race conditions, in that your vendor libraries are not being loaded before your application code executes.
code :
// main.js
    // shim allows us to configure dependencies for scripts 
    // that do not call define() to register a module 
    // e.g. vendor libs, like jQuery, underscore, Backbone, etc...
    shim: {
        backbone: {
            deps: ['jquery', 'underscore'],
            exports: 'Backbone'
    paths: {
        // vendor libs
        jquery:     'vendor/jquery',
        underscore: 'vendor/underscore',
        backbone:   'vendor/backbone'

], function( Backbone, BerlinConnectView ) {
    // at this point, $, _, and Backbone are already loaded and 
    // available within the `window` object
    var berlinConnectView = new BerlinConnectView();
], function(helpers) {
    // at this point window.Backbone should exist
    // so you should be able to refer to it globally
    return Backbone.View.extend({
        'el': 'body',
        // ...
    // ...
Why is jQuery.extend defined as a jQuery function property and jQuery.fn.extend defined as a jQuery prototype object pro

Why is jQuery.extend defined as a jQuery function property and jQuery.fn.extend defined as a jQuery prototype object pro

By : Udupi Santhosh
Date : March 29 2020, 07:55 AM
To fix this issue jQuery.extend is really just a utility function used to merge objects. It is similar to the more modern Object.assign() that didn't exist when jQuery library was started
It is used extensively in the core to add properties to the jQuery object itself but is also available for developer to use to merge their own objects using $.extend(target [, object1 ] [, objectN ] )
code :
var a = {x:1},
    b = {y:2},
    res = $.extend({}, a, b)

console.log(res) // new object { "x": 1,  "y": 2}
console.log(a) // unmodified - still {x:1}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
var obj = function() {};
obj.x = 1;
obj.log = function() {
  // `this` is `obj`
  console.log('this.x = ', this.x)

jQuery.fn.extend() - Cannot retrieve matched elements from methods of a object used to extend the $

jQuery.fn.extend() - Cannot retrieve matched elements from methods of a object used to extend the $

By : Fabian Frenkel
Date : March 29 2020, 07:55 AM
Any of those help i found a satisfying answer for my problem.
The reason for my problem as i discovered, was that after extending jQuery prototype by appending an object, every newly created jQuery object is being referred by methods of the extending object, as its owner object (this). In my case, appName object is just an object that's been appended to jQuery object and its methods doesn't refer to the jQuery object. They refer to the appName. So i changed my code to pick up the jQuery object.
code :
    appName: (function () {
        "use strict";
        var obj = {};
        var matchedElems = null;
        obj.InitApp = function () {
            if (matchedElems != undefined && 
            matchedElems != null) {
            matchedElems.css("color", "red");
        return function () {
            matchedElems = this;
            return obj;
    testApp: function () {
        this.css("color", "red");

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<p class="p1">The first paragraph in body.</p>
<p class="p1">The second paragraph in body.</p>

<p class="p2">The third paragraph in body.</p>
<p class="p2">The fourth paragraph in body.</p>
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