This course gets you up and running with react in under a minute by using codesandbox.io to skip the painful process of setting up your dev environment.

Chris Achard

React Crash Course with Hooks

In this course, we’ll create an online/offline note-taking app.  We’ll use `create-react-app` to create the frontend, and node.js to create a simple backend. 

Progressive Web Apps in React with create-react-app

We’ll build a mobile app with React Native for both iOS and Android. Prior React experience is required, but you don’t have to know mobile development to participate.

Build a React Native Application for iOS and Android from Start to Finish

In this collection, you'll create a simple game with React using Recoil, to explore how you can share and update state across an app.

Getting Started with Recoil in React

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JavaScript® (often shortened to JS) is a lightweight, interpreted, object-oriented language with first-class functions, most known as the scripting language for Web pages, but used in many non-browser environments as well such as node.js or Apache CouchDB. It is a prototype-based, multi-paradigm scripting language that is dynamic, and supports object-oriented, imperative, and functional programming styles.

javascript

There are two methods to append strings together in javascript, but there are edge cases that you have to watch out with each of them.

First, you can use the `+` operator to add strings together:

```
"first" + " " + "second"
```

which works, but watch out!  If one of your variables is a non-string value, then it will try to convert that to a string before adding it to the other string.

The other method is to use the `concat` method:

```
"first".concat(" ", "second")
```

but `concat` has a big problem because now if the first value is a non-string value (like `null` or `undefined`), then it will cause a runtime error, since the `concat` method is undefined on those values.

For that reason, most people use the `+` operator to add two strings together in javascript.

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Append two strings together in javascript (with edge cases)