Optimize performance of the React application:- React is defined as a JavaScript library for building user interfaces. There are many ways to speed up your react application. 1. Use the Production Build- If you’re facing performance problems in your React apps, make sure you’re testing with the minified production build. By default, React includes many helpful warnings. These warnings are very…

1. What is cross-browser testing? As a web developer, it is your responsibility to make sure that your project work and works for all your users. Cross-browser testing is the practice of making sure that the websites and web apps you create work across an acceptable number of web browsers. You need to think about: …

1. String.prototype.charAt():- The strings object is used to represent and manage a series of characters. The charAt() method returns a new string. Syntax charAt(index) . If the index is not provided, the default is 0, so the first character of the string is returned. …