Category: React

useMemo vs. useEffect + useState When working with React, you may come across situations where you need to optimize the performance of your components. Two commonly used hooks for this purpose are useMemo and combining useEffect with useState. In this article, we will explore the differences between these two approaches and when to use each…

React Router is a popular library used for routing in React applications. It provides a powerful way to handle navigation and rendering of different components based on the current URL. However, there may be scenarios where you need to detect when the route changes in order to perform certain actions or update the UI accordingly.…

Jest test fails: TypeError: window.matchMedia is not a function If you are encountering the error “TypeError: window.matchMedia is not a function” while running Jest tests, don’t worry, you’re not alone. This error typically occurs when you are trying to use the window.matchMedia method in your JavaScript code, but it is not available in the testing…

When working with JavaScript and JSX, you may come across an error message stating “Component cannot be used as a JSX component. Its return type ‘Element[]’ is not a valid JSX element.” This error typically occurs when the component’s return type is not compatible with JSX syntax. Fortunately, there are a few solutions to this…

Jest gives `Cannot find module` when importing components with absolute paths If you’re using Jest for testing your JavaScript code and you’ve encountered the error message “Cannot find module” when importing components with absolute paths, don’t worry, you’re not alone. This issue often occurs when Jest is unable to resolve the absolute path specified in…

Custom navigation with Navigator component in React-Native React-Native provides a Navigator component that allows you to implement navigation in your app. By default, the Navigator component provides a basic navigation experience with a stack-based navigation model. However, there may be cases where you need to customize the navigation experience to fit your app’s specific requirements.…

Import JSON file in React When working with React, you may come across a situation where you need to import a JSON file into your component. This can be useful when you want to store and access data in a structured format. In this blog post, we will explore different ways to import a JSON…

setState() inside of componentDidUpdate() When working with React, there are times when you need to update the state of a component based on certain conditions or changes. One common scenario is when you want to update the state inside the componentDidUpdate() lifecycle method. In this blog post, we will explore how to use setState() inside…

React showing 0 instead of nothing with short-circuit (&&) conditional component React is a popular JavaScript library used for building user interfaces. One common issue that developers face when using the short-circuit (&&) conditional component in React is that it displays 0 instead of nothing when the condition is false. In this blog post, we…

How do I test axios in Jest? When it comes to testing JavaScript code, Jest is a popular choice among developers. It provides a simple and powerful framework for writing tests and comes with a wide range of features. If you are using axios, a popular HTTP client library, in your JavaScript project and want…