Did you ever try to use data from multiple Promises but could not figure out how to sync up the requests to return a single result or Promise?
For example: A http request (e.g. using fetch) returns a single Promise that is executed asynchronously. If you would just execute a bunch of requests, there is no chance to get all responses into one array just by calling them after each other. Continue reading Sync up multiple Promises to a single result set with Promise.all
Did you ever ask yourself, if it makes sense to test presentational components, or if it’s just too time consuming? Good news, you’re not alone! That’s why I put together three ways to create useful Jest tests for your presentational components without spending too much time.
Continue reading 3 Quick Wins to Test Your Presentational React Components with Jest
This might sound familiar to you: You run your React app after you made some changes to test your new functionality and get an error message like this: “this.setState’ is not a function“. It’s probably because you forgot to bind a callback function before passing it down a prop. Today you’ll learn why you need to bind, and how to bind a callback function in React.
Continue reading How and Why to Bind a Callback Function in React Components
If you’re a developer who – like me – is not a good designer or a CSS pro, you might know how troublesome it can be to put together the design for your React app. You spend a lot of time tinkering with the styles, but in the end, it just doesn’t look quite nice.
Hello again! Did you ever try to display data from a remote backend in your React app? In the third part of this article series, you will learn how to fetch data from a REST API and use it inside your app.
Continue reading How to Connect your React App to a REST API
Today we’re going to create a React list component, that renders a list of Contact components. You’ll learn how to create functional stateless components and how to pass props from a parent component.
Setting up a React app can be confusing, since you have to take care of a lot of stuff that you don’t want to think about—at least at the beginning of your React journey. Fortunately there is a tool called create-react-app that is a neat shortcut. It allows you to start developing right away without having to worry about stuff like webpack and/or babel.
Continue reading How to Create a React App with create-react-app
React beginners often have a hard time learning React, since the React ecosystem seems huge. You will inevitably stumble upon stuff like Redux, Webpack or Babel very early. At this point I was so overwhelmed because I had no clue where to start first.
It was even more confusing that I didn’t even know the problems that those tools tried to solve. Today I know better and I’m going to tell you that there is no need for any of these – at least not yet.
Continue reading A React Beginners Roadmap through the React Ecosystem
Functional components are simpler and easier to test in comparison to class components. However, both of them have pros and cons and today you’ll learn the differences and when to use which type of components.
Continue reading React Functional Components vs. Class Components
React PropTypes are a good way to help you catching bugs by validating data types of values passed through props. They also offer possibilities to flag props as mandatory or set default values. They provide a great benefit with little effort.
Continue reading Validating Props easily with React PropTypes
