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ReactJS

Information Technology > Programming frameworks

Description

ReactJS is a popular JavaScript library used for building user interfaces, particularly single-page applications where you need a fast and interactive user experience. It allows developers to create large web applications that can update and render efficiently in response to data changes. ReactJS uses components, which are reusable and independent bits of code, to break the UI into manageable pieces. It also introduces concepts like virtual DOM to optimize and speed up the rendering process. Advanced features include state management with hooks and context API, routing with React Router, server-side rendering with Next.js, and more. Understanding ReactJS requires a solid grasp of JavaScript and its ES6 features.

Stacks

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Expected Behaviors

✎
LEVEL 1

Fundamental Awareness

At this level, individuals have a basic understanding of JavaScript, HTML, and CSS. They are aware of ES6 features and understand what ReactJS is and its use cases. However, they may not be able to create a React application without guidance.

🌱
LEVEL 2

Novice

Novices can set up a React environment and create a new React application. They understand JSX, can render elements, build components and props, handle events, and perform conditional rendering. They also know how to work with lists, keys, and forms in React.

🌍
LEVEL 3

Intermediate

Intermediate users can lift state up, understand composition vs inheritance, and use PropTypes for typechecking. They can use React Router, Context API, and Hooks. They also understand code-splitting, error boundaries, forwarding refs, higher-order components, and integrating with other libraries.

⭐
LEVEL 4

Advanced

Advanced users can optimize performance, use portals, the Profiler API, and understand React without ES6 or JSX. They understand reconciliation, refs and the DOM, render props, static type checking, strict mode, uncontrolled components, web components, and can test and deploy a React application.

🏆
LEVEL 5

Expert

Experts have an advanced understanding of React's internal workings and can contribute to the React library. They excel in managing complex states with Redux or similar libraries, server-side rendering with Next.js, creating custom hooks, testing patterns, and strategies, migrating large codebases, integrating React with various backends and APIs, and designing highly reusable React components and libraries.

Micro Skills

✎
LEVEL 1

Fundamental Awareness

What is ReactJS?
Understanding what ReactJS is
Knowing when to use ReactJS
Awareness of the benefits of using ReactJS
Understanding the difference between ReactJS and other frameworks/libraries
Knowledge of variables and data types
Understanding of operators
Control structures (loops, conditionals)
Functions and scope
Arrays and objects
Understanding of asynchronous programming
Understanding of HTML tags and attributes
Creating forms in HTML
Styling with CSS
Understanding of CSS selectors
Box model concept
CSS positioning and layout
Arrow functions
Template literals
Destructuring assignment
Default parameters
Classes
Modules
Promises
🌱
LEVEL 2

Novice

Installing Node.js and npm
Creating a new project using Create React App
Understanding the project structure
Running the development server
Creating components
Importing components
Rendering components in the DOM
Writing JSX expressions
Embedding expressions in JSX
Specifying attributes with JSX
Specifying children with JSX
Rendering an element into the DOM
Updating the rendered element
Defining a component
Rendering a component
Composing components
Extracting components
Passing props to a component
Rendering props
Adding local state to a class
Adding lifecycle methods to a class
Using state correctly
State updates may be asynchronous
State updates are merged
Handling events with React elements
Passing arguments to event handlers
Using if statements for conditional rendering
Inline If with logical && operator
Inline If-Else with conditional operator
Preventing component from rendering
Rendering multiple components
Basic list component
Keys
Extracting components with keys
Keys in the component elements
Controlled components
The textarea tag
The select tag
The file input tag
Handling multiple inputs
Controlled input null value
🌍
LEVEL 3

Intermediate

Understanding when to lift state up
Sharing state between multiple components
Passing data through props
Understanding the difference between composition and inheritance
Using composition to reuse code
Using props.children for component composition
Defining PropTypes for a component
Using different PropTypes validators
Setting default prop values
Setting up React Router in a project
Creating routes and nested routes
Linking and navigating between routes
Working with route parameters
Creating a context
Providing context to components
Consuming context in a component
Updating context values
Understanding the purpose of hooks
Using useState and useEffect hooks
Creating custom hooks
Rules of hooks
Understanding the need for code-splitting
Implementing lazy loading with React.lazy and Suspense
Route-based code splitting
Understanding the concept of error boundaries
Creating an error boundary component
Using error boundaries to catch errors in components
Understanding the concept of refs
Creating refs with useRef hook
Forwarding refs to child components
Understanding the concept of higher-order components
Creating a higher-order component
Using a higher-order component to enhance a component
Understanding how to integrate third-party libraries
Integrating a UI library like Material-UI or Ant Design
Integrating a state management library like Redux or MobX
⭐
LEVEL 4

Advanced

Understanding of React's diffing algorithm
Profiling components with the DevTools Profiler
Using shouldComponentUpdate and PureComponent
Using React.memo for function components
Virtualizing long lists with react-window
Creating a portal
Handling events in portals
Using the Profiler in development mode
Reading profiler results
Using the onRender callback
Creating components with createReactClass
Mixins
Understanding React.createElement
Using React.Fragment
Understanding the reconciliation process
Keys and the reconciliation process
Creating refs with React.createRef
Accessing refs
Exposing DOM refs to parent components
Understanding render prop pattern
Using render props with component props
Using PropTypes
Using TypeScript with React
Identifying unsafe lifecycles
Understanding strict mode warnings
Understanding uncontrolled components
Default values in uncontrolled components
Using web components in React
Using React components in web components
Unit testing with Jest
Component testing with Enzyme or Testing Library
End-to-end testing with Cypress
Understanding server-side rendering
Implementing server-side rendering with Next.js
Creating production build
Deploying to static site hosts
Continuous integration and deployment with platforms like Vercel or Netlify
🏆
LEVEL 5

Expert

Building a Custom HTTP Hook
Understanding the virtual DOM
Understanding the diffing algorithm
Understanding how state updates trigger re-renders
Understanding the component lifecycle in depth
Proficiency in JavaScript and ES6+ features
Understanding of open source contribution guidelines
Familiarity with the React codebase
Ability to write unit tests for new features
Ability to document new features
Profiling component performance
Optimizing render methods
Leveraging React.memo for functional components
Code splitting with React.lazy and Suspense
Experience with custom hooks
React Hooks and Custom Hooks
Familiarity with context and provider patterns
Working with React Design Patterns
Integrating React with various backends and APIs

Skill Overview

  • Expert3 years experience
  • Micro-skills157
  • Roles requiring skill5

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