Every object with its methods and properties contains an internal and hidden property known as Prototype. The Prototypal Inheritance is a feature in javascript used to add methods and properties in objects. It is a method by which an object can inherit the properties and methods of another object. Traditionally, in order to get and set the [[Prototype]] of an object, we use Object.getPrototypeOf and Object.setPrototypeOf. Nowadays, in modern language, it is being set using __proto__..
Unit testing is a software development process in which the smallest testable parts of an application, called units, are individually and independently scrutinized for proper operation. This testing methodology is done during the development process by the software developers and sometimes QA staff. The main objective of unit testing is to isolate written code to test and determine if it works as intended. Unit testing is an important step in the development process, because if done correctly, it can help detect early flaws in code which may be more difficult to find in later testing stages.
Angular, developed by Google, was first released in 2010, making it the oldest of the lot. It is a TypeScript-based JavaScript framework. A substantial shift occurred in 2016 on the release of Angular 2 (and the dropping of the “JS” from the original name – AngularJS).
Vue, also known as Vue.js, is the youngest member of the group. It was developed by ex-Google employee Evan You in 2014. Over the last several years, Vue has seen a substantial shift in popularity, even though it doesn’t have the backing of a large company.
React, developed by Facebook, was initially released in 2013. Facebook uses React extensively in their products (Facebook, Instagram, and WhatsApp). Similar to Vue, the React developers also announce their newest version on the blog section of the React website.
The Four Kinds of React State to Manage Local state. Global state. Server state. URL state.Local state is data we manage in one or another component. Local state is most often managed in React using the useState hook.Global state is data we manage across multiple components. Global state is necessary when we want to get and update data anywhere in our app, or in multiple components at least.Data that comes from an external server that must be integrated with our UI state. Server state is a simple concept, but can be hard to manage alongside all of our local and global UI state.