Articles by
Kingsley Silas

Using data in React with the Fetch API and axios

If you are new to React, and perhaps have only played with building to-do and counter apps, you may not yet have run across a need to pull in data for your app. There will likely come a time when you’ll need to do this, as React apps are most well suited for situations where you’re handling both data and state.

The first set of data you may need to handle might be hard-coded into your React application, like we did for this demo from our Error Boundary tutorial:

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Render Children in React Using Fragment or Array Components

What comes to your mind when React 16 comes up? Context? Error Boundary? Those are on point. React 16 came with those goodies and much more, but In this post, we'll be looking at the rendering power it also introduced — namely, the ability to render children using Fragments and Array Components.

These are new and really exciting concepts that came out of the React 16 release, so let’s look at them closer and get to know them.

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Handling Errors with Error Boundary

Thinking and building in React involves approaching application design in chunks, or components. Each part of your application that performs an action can and should be treated as a component. In fact, React is component-based and, as Tomas Eglinkas recently wrote, we should leverage that concept and err on the side of splitting any large chunking into smaller components.

Splitting inevitably introduces component hierarchies, which are good because they bloated components and architecture. However, things can begin to get complicated when an error occurs in a child component. What happens when the whole application crashes?! Seriously, React, why do the parent and sibling components have to pay for the sins of another component? Why?

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Digging Into React Context

You may have wondered lately what all the buzz is about Context and what it might mean for you and your React sites. Before Context, when the management of state gets complicated beyond the functionality of setState, you likely had to make use of a third party library. Thanks to recent updates by the awesome React team, we now have Context which might help with some state management issues.

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Managing State in React With Unstated

As your application becomes more complex, the management of state can become tedious. A component's state is meant to be self-contained, which makes sharing state across multiple components a headache. Redux is usually the go-to library to manage state in React, however, depending on how complex your application is, you might not need Redux.

Unstated is an alternative that provides you with the functionality to manage state across multiple components with a Container class and Provider and Subscribe components. Let's see Unstated in action by creating a simple counter and then look at a more advanced to-do application.

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How React Reconciliation Works

React is fast! Some of that speed comes from updating only the parts of the DOM that need it. Less for you to worry about and a speed gain to boot. As long as you understand the workings of setState(), you should be good to go. However, it’s also important to familiarize yourself with how this amazing library updates the DOM of your application. Knowing this will be instrumental in your work as a React developer.

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Understanding React `setState`

React components can, and often do, have state. State can be anything, but think of things like whether a user is logged in or not and displaying the correct username based on which account is active. Or an array of blog posts. Or if a modal is open or not and which tab within it is active.

React components with state render UI based on that state. When the state of components changes, so does the component UI.

That makes understanding when and how to change the state of your component important. At the end of this tutorial, you should know how setState works, and be able to avoid common pitfalls that many of us hit when when learning React.

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