 Courses from Sara Vieira

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 will use the  `@reach/router` library to create navigation that will take us to different pages in our application.

We will create a homepage and about page and switch between these without page re-renders

Create navigation between pages using  `@reach/router`

In this lesson, we will add url parameters to our application using the  `@reach/router` library.

We will use the example of getting the `username` prop from our location to greet a user.

Use url parameters in  `@reach/router`

In this lesson, we will be adding routing and two routes (homepage and about page) to a React application using the  `@reach/router` library

Add routing to your React Application using `@reach/router`

In this collection, we will dive into using  `@reach/router` as a routing option for your React application. We will start from the beginning and cover everything from Links to Nested Routes.

Using  `@reach/router` for navigation in React Apps

We will learn about the `css` prop we have at our disposal in `styled-components` to change the style of a component right in the render function.

We will use this prop to override the text color of a button with the one we define in this prop.

Using the `css` prop to define styles in Styled Components

Since now we know that we can add functions to our styling, we can do so much. Here we have a json file with a list of the 20 worst movies on IMDB. We can actually change the colors of our list using `if` blocks.

We will take a look at how to style your components very granularly based on their props. We will style a component based on a float value, string, and its position in the array.

Style a component based on complex props with Styled Components

We will learn how to use the `styled-components` library using the object notation instead of template strings.

To use object notion, we will replace our backticks with a function and we can use props to change our elements. 

We will go through a heading and transform it from template literals, backticks, to objects.

Use Styled Components with the Object syntax

We will learn about the `attrs` method that allows us to change and add attributes to our styled elements.

We have the two buttons that we made in a previous lesson. We can add `.attrs` onto our `styled.button` to be able to add on types. `attrs` can return an object or a function. We will see the difference between the two and why you would use one over the other.

Use the `attrs` method to add HTML attributes in styled-components

In this lesson, we will use the `as` prop to reassign the HTML tag that is associated with one of our styled components.

The `as` prop will be used to reassign a `button` element to be an `a` element

Using the `as` prop to reassign the HTML tag

We will use the `styled-components` library to go over how to style pseudo-selectors and classes.

The pseudo-selectors, such as `hover` and `before`, work the exact same as regular CSS. In our `element` or `class` styling backticks, we can set them like `:hover{}` and `:before{}` to change what the element or component does.

Style pseudo-selectors and classes in Styled Components

We will integrate a theme in our small app using `styled-components` and the `ThemeProvider`.

In the `index.js` file, where you have your `App` component being rendered, we will wrap it with the `ThemeProvider`. We can set some colors to an object and call it `theme`. We set that `theme` to be the `theme` prop inside of our `ThemeProvider`. 

Now over in our `App.js` file, we can gain access to those colors stored in our theme by setting `color: ${props => props.theme.colors.purple};`. We can change any `css` in that `theme` object and get access to that wherever we want.

Create and use a Theme in Styled Components

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

We will be using the `keyframes` function from styled-components to animate the position and rotation of an `h1`.

Like styling using the global variable, we set the `keyframes` keyword to a variable and inside of the backticks, we set what we want our `element` to do. Then in a custom `element`, we set `animation` to our custom `keyframes` variable.

Animate Styled Components in React

We are going to learn how to add styles to a react component using the `styled-components` library.

We will get a list of people and give a different color and background color when their position in the list is an even number, like zebra stripes. 

Inside of the backticks for our custom styled element, we can interpolate and add in a function that checks if the name in our array is at an even position, it’ll change the text color to white and the background color to black.

Adjust Style based on props with Styled Components

We will create global styles that apply to the whole document using the `styled-components` library. 

We create a global style using the `createGlobalStyle` keyword and set that to a variable. Inside of that variable, we can now set our custom styles. We wrap our application in inside of a fragment, `<>`, and put our new global style up at the top, just below the fragment.

Creating Global Styles with Styled Components

We are going to learn how to add styles to a react component using the `styled-components` library.

I've done a lesson on how to [Style an HTML Element with Styled Components](https://egghead.io/lessons/react-style-an-html-element-with-styled-component) but now it's time to style React Components. We'll be able to wrap a React component in a styled component to extend the style of that component.

To style an HTML Element, you would do `styled.{element}` but with a component, you would replace the `.` with a `()` so it would look like `styled({component})`

Here, we will style a button from `material-ui` and adjust his size with css.

Style a React Component with Styled Components



In the course, we will learn how to use the `styled-components` library to style our React applications. We will start from the basics and dwell in more advanced cases.

With this course, you can get the necessary knowledge to use the `styled-components` library to style your React applications in the future.



Styling React Applications with Styled Components

We are going to learn how to make our first component using the `styled-components` library.

We'll use `styled.h1` to create a `<h1>` component and adjust it's font-family, positioning and color with css.

Style an HTML Element with Styled 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.

Sara Vieira

Search Results

Create navigation between pages using `@reach/router`

Use url parameters in `@reach/router`