 Courses from Andrew Del Prete

React is one of the web’s most popular frameworks for building JavaScript applications. 

If you know what you’re doing, React can drastically simplify how you build, use, and maintain code.

Whether you’re a React newbie or you’re ready for advanced techniques, you can level-up with egghead. Explore our in-depth courses, lessons, and community resources to build more powerful applications and crack open your career.

react

In this lesson we'll use React Live to preview and edit a component directly in the browser. React Live is a great tool for rendering interactive documentation or any place you would like to demonstrate a React component with a live preview and editing capabilities.

**Additional Resources**
https://github.com/FormidableLabs/react-live

Preview and edit a component live with React Live

In this lesson we'll use mdx-deck to create a slide deck using Markdown and React. We'll look at adding multiple slides, code snippets, and importing React components. We'll also leverage the mdx-deck CLI for our development environment and building for production.

*Additional Resources: *

https://egghead.io/lessons/react-create-and-import-react-components-with-markdown-using-mdxc

https://github.com/jxnblk/mdx-deck

https://twitter.com/jxnblk/status/1023667155324346373

Build a slide deck with mdx-deck using Markdown + React

Vue (pronounced /vjuː/, like view) is a progressive framework for building user interfaces. Unlike other monolithic frameworks, Vue is designed from the ground up to be incrementally adoptable. The core library is focused on the view layer only, and is very easy to pick up and integrate with other libraries or existing projects. On the other hand, Vue is also perfectly capable of powering sophisticated Single-Page Applications when used in combination with modern tooling and supporting libraries.

In this lesson, we'll use vue-testing-library along with Jest to write some integration tests for a Counter component. What's nice about the vue-testing-library and it's equivalents like dom-testing-library and react-testing-library is that it has several functions to retrieve and assert on elements like a user would when interacting with your application. 

When a user clicks a button, they're not clicking on a CSS class (as some testing libraries suggest), they're clicking on a button labeled "Increment". The user doesn't know about the implementation details, so testing an app this way makes sense. We'll look at several of the getBy* functions vue-testing-library offers to test our component.

**Additional Resources:**

https://blog.kentcdodds.com/introducing-the-react-testing-library-e3a274307e65?gi=2b3d25b4f1cd

https://github.com/dfcook/vue-testing-library


Integration test a Vue component with vue-testing-library

In this lesson, we'll use Jest to unit test a Counter component built with Vue. Vue's baked in testing library provides the necessary functionality to render components, invoke methods, and make assertions.

**Additional Resources**

https://vue-test-utils.vuejs.org/

Unit test a Vue component with Jest

In this lesson we'll go through the process of setting up Storybook for Vue. We'll use Vue CLI to create a new Vue application and Storybook CLI to setup some initial stories and config. Storybook can help you develop UI components in an isolated area without running your full application.

*Additional Resources*
https://medium.com/storybookjs/introducing-storybook-for-vue-940f222541c5
https://storybook.js.org/basics/guide-vue/

 Getting Started With Storybook for Vue

In this lesson, I refactor a simple Counter component connected to Redux to use Unstated instead. I explain some of the cognitive overhead of working with Redux and how Unstated can help simplify your application codebase.

*Additional Resources*
https://github.com/jamiebuilds/unstated

Refactor a connected Redux component to use Unstated

In this lesson I demonstrate how to use the library MDXC to create and import React components with Markdown. MDXC converts markdown into JavaScript and supports JSX.

*Additional Resources:*
https://github.com/jamesknelson/mdxc

Create and import React components with Markdown using MDXC

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

In this lesson I cover the difference between the Spread and Rest syntax using an array of animals as an example. Spread is used to expand a list of items into an array or object and Rest is often used to help deal with function arguments, but can be used in a variety of circumstances to collect all items remaining excluding the assigned ones.

*Additional Resources*:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/rest_parameters 

The difference between the Spread and Rest syntax

In this lesson I show how to use webpack to code split a modal component in VueJS. Code splitting is a useful tool to help eliminate unused code and only load what's necessary.

**Additional Resources**
https://vuejs.org/v2/guide/components-dynamic-async.html
https://medium.com/js-dojo/3-code-splitting-patterns-for-vuejs-and-webpack-b8fff1ea0ba4

Code split a modal component in VueJS

In this lesson I show how to use webpack to code split based on route in VueJS. Code splitting is a useful tool to help eliminate unused code and only load what's necessary.

*Additional Resources*
https://router.vuejs.org/en/advanced/lazy-loading.html


Code split by route in VueJS

In this lesson I refactor a React component that uses local state to use Unstated. I also show how you can utilize Unstated as a global store for two separate rendered components.

*Additional Resources:*
https://medium.com/react-native-training/unstated-the-setstate-of-react-state-management-8ce47b240e6d
https://github.com/jamiebuilds/unstated

Use Unstated to share state between two separate rendered components

In this lesson we look at how to use react-adopt to compose multiple Context Consumers into one reusable component to avoid render prop hell. 

Additional Resources:
https://github.com/pedronauck/react-adopt

Compose render prop components with React Adopt

In this lesson I refactor some code that utilizes the Mutation component to update client-side cache to use the new ApolloConsumer component baked into react-apollo 2.1.

Additional Resources: 
https://dev-blog.apollodata.com/introducing-react-apollo-2-1-c837cc23d926

Update Application State with React Apollo ApolloConsumer Component

In this lesson I refactor a React component that utilizes a higher-order component for mutations to the new Mutation render prop component baked into react-apollo 2.1.

Additional Resources:
https://dev-blog.apollodata.com/introducing-react-apollo-2-1-c837cc23d926

Update Application State with React Apollo Mutation Component

The componentWillReceiveProps() method is being deprecated in future version of React (17). Many of us use this method day-to-day to check for incoming prop changes, store state, and to invoke side effects like logging or fetching data from a server.

In this lesson, we'll look at how to refactor an existing component that uses componentWillReceiveProps() to instead use getDerivedStateFromProps() and componentDidUpdate().

Additional Resources:
https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html#migrating-from-legacy-lifecycles



Refactor componentWillReceiveProps() to getDerivedStateFromProps() in React 16.3

In this lesson, we look at the new forwardRef() method in React 16.3, and how it helps us forward a ref through a Higher-order component to reference an inner DOM node.


Additional Resources:
https://reactjs.org/docs/forwarding-refs.html

Use forwardRef() in React 16.3

In this lesson we'll use the new createRef() method to retrieve a node in a child component and pass it back to it's parent component. We'll also show how you can use a ref in a functional component with createRef().

Additional Resources:
https://reactjs.org/docs/refs-and-the-dom.html#exposing-dom-refs-to-parent-components



Using createRef() to reference a node in a child component in React 16.3

In this lesson, we look at where we came from with refs in React. Starting with the deprecated string ref pattern, callback refs, and then how to use the new `createRef()` method in React **16.3**.

Additional Resources: [refs and the dom](https://reactjs.org/docs/refs-and-the-dom.html
https://reactjs.org/blog/2018/03/29/react-v-16-3.html)

Reference a node using createRef() in React 16.3

In this lesson we look at how the Apollo @client directive can be used to fetch client-side state along with server data with one query. I also show how to update the client-side state using a mutation connected to a button.

Additional Resources [Apollo Client 2.0](https://dev-blog.apollodata.com/apollo-client-2-0-beyond-graphql-apis-888807b53afe)


Fetch Server Data and Client-side State in One Query using React Apollo + GraphQL

In this lesson I refactor a React component that uses local state to use Unstated. Unstated provides a very nice and straight-forward API to help you manage global state painlessly. 

Additional Resources:
 - [State Management with Unstated](https://medium.com/react-native-training/unstated-the-setstate-of-react-state-management-8ce47b240e6d)
 - [Unstated github](https://github.com/jamiebuilds/unstated)

Use Unstated for State Management in React

In this lesson I refactor a React component that utilizes the graphql higher-order component to the new Query render prop component baked into react-apollo.

Additional Resources:
[What's next for React Apollo](https://dev-blog.apollodata.com/whats-next-for-react-apollo-4d41ba12c2cb)


Fetch Data from GraphQL with React Apollo Query Component

When comparing two visually similar websites, it can often be challenging to precisely identify the subtle differences between them. To facilitate a rapid analysis of these discrepancies, a practical technique involves leveraging Chrome's integrated developer tools to capture full-page screenshots of each site. Subsequently, these screenshots can be uploaded to a platform like AI Studio. There, the AI can analyze the images and generate a report detailing the variations. This entire process, leveraging a few quick shortcuts, can be completed in under a minute, delivering a comprehensive breakdown of the differences for efficient comparison and analysis.

Quickly Compare Two Sites Using AI Studio with Chrome Full Page Screenshots

It's fairly trivial to create a React project, but there's always a big hurdle between creating it locally and making it shareable so that someone else can run it. This lesson walks you through the process of automating creating a React project locally, creating the repository where it's going to be hosted, and creating shareable links where it can be run so that you can quickly and easily create single one-off demos and shoot them over to your friends and coworkers for sharing your code ideas in a working environment.


```bash
share-react-project() {
  if [[ -z "$1" ]]; then
    echo "Usage: share-react-project <project_name>"
    return 1
  fi

  local project_name="$1"
  local github_username=$(gh api /user --jq '.login')

  echo "Creating Vite project: $project_name"
  pnpm create vite "$project_name" --template react

  cd "$project_name"

  echo "Initializing Git repository"
  git init

  echo "Adding all files to Git"
  git add .

  echo "Creating initial commit"
  git commit -m "Initial commit"

  local codesandbox_link="https://codesandbox.io/p/github/${github_username}/${project_name}"

  echo "Adding CodeSandbox link to README.md"
  echo "" >> README.md
  echo "## CodeSandbox" >> README.md
  echo "[![Open in CodeSandbox](https://assets.codesandbox.io/github/button-edit-blue.svg)](${codesandbox_link})" >> README.md

  echo "Adding README.md to Git"
  git add README.md

  echo "Committing README.md changes"
  git commit -m "Add CodeSandbox link"

  echo "Creating GitHub repository: $github_username/$project_name"
  gh repo create "$github_username/$project_name" --public

  echo "Pushing to remote 'origin'"
  git push -u origin main

  echo "Project '$project_name' created successfully!"
  echo "GitHub repository: https://github.com/$github_username/$project_name"
  echo "CodeSandbox link: $codesandbox_link"
}
```

Automate Creating a Local React Project, GitHub Repository, and Live Hosted Demo in a Single Command

[Verdaccio](https://verdaccio.org/) is a fully featured NPM registry that you can run locally on your machine. It’s a great tool for testing your release process, running end-to-end tests, and simulating real-world scenarios like deploying packages, installing them, and verifying functionality as an end user would.

Nx includes a [generator](https://nx.dev/features/generate-code) that simplifies setting up Verdaccio. To configure it, run:

```shell
npx nx g @nx/js:setup-verdaccio   
```

This command installs the necessary NPM packages and creates a `project.json` file with a `local-registry` target. To start the local registry, open a new terminal window and run:

```shell
npx nx local-registry
```

This will:
- Launch the Verdaccio registry.
- Configure NPM to point to the local Verdaccio server at `http://localhost:4873`.

> **Note:** A `project.json` file provides an advanced way to define scripts, offering more flexibility than a traditional `package.json` for managing complex targets.

Setup local Verdaccio server to release NPM packages

Learn how to spin up a local NPM registry powered by Verdaccio to test deploy your NPM packages.

In TypeScript, developers often begin by defining the structure of their data using type definitions or interfaces, which is a powerful way to ensure type safety. However, as applications grow and become more complex, simply defining the shape of an object might not be enough to guarantee its consistent creation and behavior throughout the codebase. This often leads to situations where objects that are intended to be of a certain "type" might be missing crucial properties or have incorrect data, which can be difficult to track down and debug.

This lesson tackles the question of when and why to move beyond basic type definitions and embrace classes in TypeScript. It demonstrates how classes provide a more robust mechanism for defining object structure, enforcing type constraints, and ensuring consistent object creation. By establishing a clear blueprint for objects, classes not only improve compile-time type safety but also offer runtime benefits and better code organization, ultimately helping developers avoid common pitfalls associated with loosely structured objects in larger TypeScript projects.

Stop Avoiding Classes in TypeScript

Karabiner isn't only for your keyboard. It can also hijack your mouse buttons and enable them to be similar to layers on your keyboard, where holding down a mouse button can allow you to tap keys on your keyboard to trigger commands and macros that can completely revolutionize your workflows. For example, you can hold down the right mouse button and tap on R to go to references in VS Code. Or hold down the right mouse button and tap the left mouse button to chop up videos and Screenflow.

This completely unlocks a whole new world of possibilities and use cases for your mouse as you can hover your mouse over anywhere on the page. And just tapping keys on your keyboard allows you to trigger mouse actions, to trigger keyboard actions, or to trigger macros and applications and terminal commands. and anything that your imagination can come up with. 

Karabiner: Rethinking Right-Click as a Macro Command Center

Make an HTML table more readable on mobile devices by using the ::before pseudo-element. We add labels to each cell, so they appear like cards when the table is viewed on smaller screens. The ::before content is set using a data-label attribute for each cell to enhance mobile viewability without horizontal scrolling.



Create a mobile friendly table with the before pseudo-element

Learn to use CSS ::before pseudo-element for mobile-friendly HTML tables. Add labels to cells for enhanced readability on mobile, avoiding horizontal scroll.

Any app of a decent size has event flows and messages being passed around. At a certain point it becomes complicated to explain it through prose and you want to turn towards diagrams. Now setting aside the time to create diagrams that accurately describe what's happening in your codebase can be quite time consuming. Luckily, with today's AI tools, we can now just do basic walkthroughs with rough recordings over codebase dictating what's going on along the way and then upload that to tools like AI Studio and then ask it to generate diagrams in a text-based format such as Mermaid that will then generate the flowcharts and diagrams for us. So this video walks us through this process of recording a rough video, uploading it to AI Studio and then asking AI Studio to generate the proper Mermaid diagram syntax.

Generate Mermaid Flow Chart Diagrams with Gemini 2.0 from Rough Screen Recordings

I'm a diehard Karabiner user and anytime I start doing something repetitively I always move it into my Karabiner configuration. Sometimes I'll fall into scenarios where I want to trigger a command, but I also want to know if that command succeeded or failed. Since Karabiner can trigger any command, setting up the command is fairly straightforward, but knowing whether it succeeded or failed became much more difficult. Luckily for me there is a package called terminal-notifier that you can install from homebrew and you can pipe the output of your command to terminal-notifier. And have a seamless way of triggering your keyboard shortcut which runs a command and you can be notified of the results.

Use Karabiner to Trigger a Terminal Command and Get Notified of the Results

There are a lot of scenarios when inspecting a site in Chrome where you don't want any click events to fire and you don't want any scripts to run. Or maybe something is animating in and out of the page and you want to capture it at a certain moment. This is a great use case for pausing script execution, which is kind of using the debugger manually by going into the Chrome DevTools and the Sources tab and clicking the pause button to essentially pause the entire page. This will give you a chance to inspect any of the elements and styles you want to inspect. And you don't have to worry about fire and click events or anything that might interrupt your investigation into the elements and styles that you want to find.

Pause Script Execution in Chrome to Easily Inspect Elements

Gemini 2.0 has a context window of a million tokens, and this means that you can upload hundreds of files and allow it to inspect and analyze massive refactors across entire code bases. 

This lesson demonstrates concatenating an entire code base into a single file and then uploading it to AI Studio. Once within AI Studio, we ask it to find the types of tasks that it can evaluate for us. Then we select one of the tasks and ask it to generate instructions for that task. Once those instructions are complete, we then turn them over to Windsurf's Cascade agent, and we allow Windsurf's Cascade to do all of the work for us as we sit back, relax, and let the AI do our jobs.

Andrew Del Prete

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