We can find the specific condition with the help of the _.whare() function. The _.where() belongs to underscore.js a javascript library that provides versatile functions. The _.where() is a function used to find the specific element according to the given conditions. Suppose you want to find all the user details of the class and then apply the _.where() function to the list of all the sections and pass the condition as the section name. So the name of all the users with the specific condition will be returned. Syntax _.where( list, [predicate], [context] ) The function accepts three-argument as ... Read More

In this tutorial, you will learn about JavaScript decorators and get to know about their inner workings and uses. What are Decorators in JavaScript? The word decorator means combining a set of code or program with another or can be said as wrapping a function with another function to extends the functionality or working of the function. Decorator can also be called as decorator function. Developers have been using this decorator term in other languages like python, C# and now JavaScript has also introduced the decorator. Function decorators In JavaScript functions behaves like objects so they are also known as ... Read More

In this tutorial, you will learn about JavaScript DOM manipulation using a service worker. DOM manipulation happens is when we change the structure and elements of the document object model(DOM). We can modify DOM by adding, removing, Changing, or modifying elements and their attributes. What is a Service worker? Service workers work like proxy servers between web browsers and the web server. It adds enhancement to the existing websites in case the user’s browser doesn’t support the service worker but he visits any website that uses the service worker then also no function gets affected. It acts between web applications, ... Read More

In this tutorial, you will learn about the procedure to upload images in firebase using HTML and JavaScript. Firebase − Firebase is a cloud-based storage platform that is a product of google which provides storage services that are used in various web and mobile application development. It provides NoSQL and real-time hosting of the database, authentication, notification, content, and many more services. Steps to upload an image using HTML and JavaScript in Firebase To connect firebase to the project, you should create a project on firebase here is the step-by-step procedure to create and activate the storage service to upload ... Read More

In this tutorial, you will learn how to create an audio and video recorder using JavaScript MediaRecorder API. So this can be done using WebRTC. What is WebRTC? WebRTC is a short form of Real-Time Communication. We can access and capture the Webcam and Microphone devices that are available there in the user device. We can access the user device’s Webcam and microphone using an ECMAScript object navigator.mediaDevices.getUserMedia(constraints). So, the getUserMedia function by default, seeks user permission to use your Webcam. This function returns a promise and once you click ok and give the consent, then the function ... Read More

In this tutorial, let us discuss the basic rules for JavaScript parameters. A JavaScript function is a code that performs a particular task. The function parameters are the name list in the function definition. Parameters are also known as formal parameters or formal arguments. We can follow the syntax below to declare parameters. Syntax function functionName(param1, param2) { } When there is no value for a parameter, a default value comes in place. Rules Declare the default parameters as the final ones to avoid an error. The JavaScript function definition does not specify a parameter type. The JavaScript ... Read More

In this tutorial, we're going to learn how to set up video.us using JavaScript. We'll also have a look at a few examples for better understanding. First of all, Video-js is a very popular and easy-to-use modern web video player that has been built up on HTML5 and it provides better features and functionality for a web video player. It supports a variety of video playback formats - both the standard HTML5 formats also and the modern formats like Youtube, Vimeo, and Flash also. On top of that - it works with almost all the display sizes like Desktops, mobiles, ... Read More

We use the for loop statement of JavaScript for repeating a set of statements inside the loop body a specified number of times. A nested for loop, as the name suggests, is made up of more than one for loop one nested inside of the other. This allows us to loop over multidimensional data structures such as matrices. The nested for loop in JavaScript A simple for loop executes a specified number of times depending on the initialization value and the terminating condition. A nested for loop on the other hand, resides one or more for loop inside an outer ... Read More

In this tutorial, we will learn to create and save the text file in JavaScript. Sometimes, developers need to get texts or content from the user and allow users to store content in a text file and allow the file to download to the local computer. Many JavaScript libraries are available to achieve our goal, but we have used the best two libraries in this tutorial to create and save the text file. Create a text file using custom text and save it to a local computer We will use normal JavaScript operations to create and save the text file ... Read More

To get the current screen size of a web page, use the window.inner. We can also use the window.outerWidth and window.outerHeight as shown below to get the outer width and height of the web browser windows. We will see two examples − Get the Inner Width and Height Get the Outer Width and Height Get the Inner Width and Height To get the current screen size of a web page, use the window.innerWidth and window.innerHeight − var wd = window.innerWidth; var ht = window.innerHeight; Example Let us see an example − DOCTYPE html> ... Read More