const empty = {}; Object.keys(empty).length === 0 && empty.constructor === Object; # Why do we need an additional constructor check?You may be wondering why do we need the constructor check. Well, it's to cover for the wrapper instances. In JavaScript, we have 9 built-in ...
In this article, we are going to explore how to create a JavaScript object from the desired key-value pairs. Let’s understand the steps involved as below−Steps: Step I − We are first going to create an Empty Object. let object = {}...
1 2 3 4 5 AJS.toInit(function(){ if (AJS.params.remoteUser == ''){ <!-- INSERT THE JS CODES HERE --> } }); An empty remoteUser object denotes to anonymous users. A user who has successfully logged in has a username stored inside the remoteUser object. ...
Different Types of Arrays in JavaScript Create and Parse a 3D Array in JavaScript This article addresses the following. Introduction to parsing How to create an array in JavaScript? How to do parsing on an array in JavaScript? Different types of arrays Creating and parsing a 3D array in Ja...
Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more.
Learn how to populate an empty array in JavaScript. Given an empty array, write JavaScript code to populate an empty array.
This is a guide to 2D Arrays in JavaScript. Here we discuss How to Create 2D Arrays in JavaScript along with the operation and the Concept of Jagged Arrays. You may also have a look at the following articles to learn more – JavaScript Map Object ...
Using the Object.assign() method, we create a new object obj by merging the array elements into an empty object {}. The Object.assign() method iteratively copies the properties of the source object (in this case, the array) into the target object (an initially empty object). Finally, ...
How to Check If an Object Is Empty in JavaScript Use Object.keys Loop Over Object Properties With for…in Use JSON.stringify Use jQuery Use Underscore and Lodash Libraries 1. Use Object.keys Object.keys will return an array, which contains the property names of the object. If the length of...
To convert the above 400 by 400 puzzle image into useful puzzle pieces (or tiles), we first create an in-memory image object of the image to be sliced (400x400.png) and invoke an anonymous function when the image has fully loaded: JavaScript Copy var image = new Image(); image.src...