ReactJS

Resources / Skills

ReactJS Skill Overview

Welcome to the ReactJS Skill page. You can use this skill
template as is or customize it to fit your needs and environment.

Category:

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

MERN,

Serverless,

PERN,

Expected Behaviors

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.
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.
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.
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.
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

Fundamental Awareness24 micro skills • 3 months work experience

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

Novice41 micro skills • 12 months work experience

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

Intermediate36 micro skills • 24 months work experience

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

Advanced37 micro skills • 36 months work experience

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

Expert19 micro skills • 36 months work experience

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

Tech Experts

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