If you have started to use React's useState hook for your application, you may be missing a callback function , because only the initial state can be passed to the hook. In React class components, the setState method offers an optional second argument to pass a callback function. However, this second argument isn't available for React's useState…

For all my React Native tutorials, I intend to use Expo as baseline, because it just makes things so much easier when developing an app with React Native. If you want to follow my tutorials about React Native, you should get this setup right. React Native with Expo Expo is a powerful environment for React Native which helps you from creation to…

React's useMemo Hook can be used to optimize the computation costs of your React function components . We will go through an example component to illustrate the problem first, and then solve it with React's useMemo Hook . Keep in mind that most of the performance optimizations in React are premature. React is fast by default, so every…

React's useCallback Hook can be used to optimize the rendering behavior of your React function components . We will go through an example component to illustrate the problem first, and then solve it with React's useCallback Hook . Keep in mind that most of the performance optimizations in React are premature. React is fast by default, so every…

An Oak application is most often used as a backend application in a client-server architecture whereas the client could be written in React.js or another popular frontend solution and the server could be written in Oak. Both entities result in a client-server architecture (frontend and backend relationship) whereas the backend would be needed for…

Oak, the successor of Koa (which is the spiritual successor of Express in Node.js), is the most popular choice when it comes to building web applications with Deno. However, when saying web applications with Deno, it's often not for anything visible in the browser (excluding server-side rendering of a frontend application). Instead, Oak, a web…

Handling errors in Express is often an afterthought. However, it should usually start with your Express routes, because if an error happens, your user needs to be notified about it. With the right techniques at hand, error handling in Express becomes pretty straight forward. There are several scenarios why an error might happen. It can be that a…

React's memo API can be used to optimize the rendering behavior of your React function components . We will go through an example component to illustrate the problem first, and then solve it with React's memo API . Keep in mind that most of the performance optimizations in React are premature. React is fast by default, so every performance…

Environment variables are great for hiding sensitive information about your Deno application. This can be API keys, passwords, or other data which shouldn't be visible to others. That's why there exists the .env file, which you would have to create, to hide sensitive information. We will create this file and pass some sensitive information to it…