Category: React

When writing unit tests for asynchronous JavaScript code, it is important to ensure that all asynchronous code has finished executing before making any assertions. This is crucial to avoid false positives or false negatives in your test results. In this blog post, we will explore different ways to make Jest wait for all asynchronous code…

React Native Responsive Font Size As a React Native developer, you may often come across the need to make your app’s font size responsive to different screen sizes. In this blog post, we will explore different approaches to achieve responsive font sizes in React Native. 1. Using the Dimensions API One way to make font…

React.js: Identifying different inputs with one onChange handler When working with forms in React.js, it is common to have multiple input fields that need to be handled by a single onChange event handler. However, identifying which input triggered the event can be a challenge. In this blog post, we will explore different approaches to solve…

How to Disable Open Browser in Create React App (CRA)? If you are using Create React App (CRA) for your JavaScript project, you might have noticed that by default, it opens a new browser tab whenever you start the development server. While this behavior can be useful in some cases, there are situations where you…

How to change the value of a Context with useContext? When working with React’s Context API, you might come across a situation where you need to change the value of a context dynamically. Fortunately, with the useContext hook, it’s easy to achieve this. In this article, we’ll explore different approaches to change the value of…

How do you Hover in ReactJS? – onMouseLeave not registered during fast hover over ReactJS provides a straightforward way to handle hover events using the onMouseEnter and onMouseLeave event handlers. However, there is a common issue where the onMouseLeave event is not registered during a fast hover over. In this blog post, we will explore…

Simulate a Button Click in Jest Jest is a popular JavaScript testing framework that allows you to write tests for your JavaScript code. When writing tests, you may come across a situation where you need to simulate a button click. In this blog post, we will explore different ways to simulate a button click in…

React Display Line Breaks from Saved Textarea When working with React, you may come across a scenario where you need to display line breaks from a saved textarea. By default, when you retrieve the value of a textarea in React, line breaks are represented by the “n” character. However, when rendering this value in the…

What are these three dots in React doing? If you have been working with React for a while, you might have come across the three dots (…) syntax in various places. These three dots are known as the spread operator and the rest parameter in JavaScript. In React, they are used for different purposes, and…

Uncaught Error: Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function but got: object If you are a JavaScript developer, you might have come across the error message “Uncaught Error: Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function but got: object” while…