Category: Advanced Chapters

We often need to compare dates in any programming language. In JavaScript the date is one of the data types, and it is common for developers to work with dates while building applications or, writing certain date based programs. Let’s understand the need to compare the date with a real-life example. Most of you are…

We all know that there is a common task in web development which is uploading files to a server. Even though the most common way to submit files is using forms, there are various methods as well. In this chapter we will cover three main approaches given below − Let us discuss above approaches in…

Truthy & Falsy Values In JavaScript, true and false values are related to boolean evaluation. Every value in JavaScript has an inherent boolean “truthiness” or “falsiness,” which means it can be determined as true or false in boolean contexts like conditional expressions and logical operators. Example Let us use a scenario and a simple JavaScript…

tRPC is a type-safe TypeScript module that uses the RPC API design to process API requests and return results. RPC refers to Remote Procedure Call. The tRPC builds on RPC. RPC is an architectural method for creating REST-like APIs. RPC replaces the Fetch and REST APIs. What is tRPC? As the name suggests, tRPC adds…

What is Throttling? Throttling is a technique that limits how many times a function can be called in a specific period of time. It improves the speed and responsiveness of web sites by implementing event listeners that do heavy or expensive tasks such as animations, scrolling, resizing, getting data, etc. For example, if you have…

The Temporal Dead Zone (TDZ) is a JavaScript concept which explains how variables behave when let and const are used. It means that before a variable can be used it needs to be defined. This takes place in between the declaration of the variable and the start of the block like a function or loop.…

The Array.sort() method in JavaScript is an essential tool for any developer that works with data sets. While sorting a list of numbers or words is simple, sorting arrays of objects based on numerous criteria becomes more complicated. In this chapter, we will look at various ways for making full use of Array.sort() for creating…

This chapter will show the CRUD operations on a JavaScript object. The operations are Create, Read, Update, and Delete. We can create, modify, take input, and delete objects with these actions. A JavaScript object consists of a collection of keys, values, or properties/attributes, and entries. Values can be any type of data, including arrays, JavaScript…

Session Storage in JavaScript The JavaScript sessionStorage object is a window object property that appears in all current browsers. The page’s protocol, host-name and port are linked to any sessionStorage data. Each window contains its own session storage. The JavaScript sessionStorage method contributes to the reliable storage of user data. In JavaScript, we use the…

JavaScript Selection API allows us to access and change or modify the portion of a web page which is selected by the user.This includes selecting which text or elements to highlight and providing options for connecting with the selected item. But it should be noticed that the Selection API is not available in Web Workers…