Manage your React state with Recoil!
This talk goes through the basics of Recoil, including working with atoms and selectors, and consuming state using Recoil hooks.
"Why and how we use Recoil in React and React Native apps", Sergii Zhuravel Fwdays
Recoil is an ambitious project from the React team. It wants to become a leader among the state management libraries for React applications. But in two years it remains experimental. How does Recoil attract developers? Can it be used in production projects? And why is it still experimental? I want to talk about all this and a little more in my talk.
The document discusses refactoring an asynchronous Redux application from using Redux Thunk to Redux Saga. It begins by showing an example of an asynchronous action using Redux Thunk, which involves chaining callbacks. It then introduces Redux Saga as an alternative that uses generator functions to manage asynchronous logic in a cleaner way. The document shows how the same asynchronous action can be rewritten using Redux Saga effects like put(), call(), and takeEvery() within generator functions. Overall, the key points are that Redux Saga encapsulates side effects, has a more readable syntax than Redux Thunk, and makes asynchronous workflows easier to test.
React is a JavaScript library for building user interfaces. It is not a full framework and only handles the view layer. React uses a component-based approach where UI is broken into independent, reusable pieces. Components render HTML and have their own internal state. This makes components predictable and easier to debug. However, React alone is not enough to build full applications and must be used with other libraries for functionality like data fetching and routing. While React takes more time to learn initially, it can improve development speed and code quality for larger teams through its patterns and emphasis on component design.
The document discusses React's virtual DOM and how it allows for more efficient DOM updates compared to directly manipulating the real DOM. It explains that the virtual DOM is an in-memory representation of the real DOM that allows React to calculate efficient DOM changes before applying them to the real DOM. This avoids unnecessary re-renders and improves performance. It also describes how React uses a diff algorithm and DOM traversal with breadth-first search to determine the minimal number of operations needed to transform the virtual DOM before updating the real DOM in a batched way.
Intro To React Native
with Varun Vachhar
OVERVIEW
React Native introduces a new way to write native mobile apps. You can take everything that you know and love about React and apply it to native apps. Unlike hybrid apps, it gives you access to both native APIs and UI components. The application logic uses JavaScript whereas, the UI is fully native! It also brings the best of the web to native, things like – flexbox layout model, XMLHttpRequest, requestAnimationFrame, etc.
OBJECTIVE
To introduce the audience to React Native. Show how they can leverage their knowledge of web development to build native apps.
TARGET AUDIENCE
Developers familiar with React who are interested in building native mobile apps.
ASSUMED AUDIENCE KNOWLEDGE
Basic knowledge of React, ES6 and CSS.
FIVE THINGS AUDIENCE MEMBERS WILL LEARN
What is React Native
How it is an extension of hybrid
How to use polyfills to leverage the best of the web while getting native performance
How to debug React Native apps
How to use Flexbox and CSS for styling a React Native app
The document discusses React Native and GraphQL. It introduces React Native as a way to build native mobile apps using React and JavaScript. GraphQL is presented as an alternative to REST and OData for mobile backends by allowing clients to specify the data structure needed and supporting relationships between data. The document demonstrates GraphQL queries using an online IDE and AWS AppSync as an option for building GraphQL backends with features like subscriptions and offline support.
This document provides an introduction to ReactJS, including:
- Why React is simple, declarative, and allows building of composable components
- React's popularity, with over 900,000 downloads in the last month
- How React addresses issues with traditional web development through its use of virtual DOM and componentization
- An example component is demonstrated to show how to: render in JSX, make components dynamic and interactive through props and event handling, access the DOM through refs, and manage state.
"Why and how we use Recoil in React and React Native apps", Sergii Zhuravel Fwdays
Recoil is an ambitious project from the React team. It wants to become a leader among the state management libraries for React applications. But in two years it remains experimental. How does Recoil attract developers? Can it be used in production projects? And why is it still experimental? I want to talk about all this and a little more in my talk.
The document discusses refactoring an asynchronous Redux application from using Redux Thunk to Redux Saga. It begins by showing an example of an asynchronous action using Redux Thunk, which involves chaining callbacks. It then introduces Redux Saga as an alternative that uses generator functions to manage asynchronous logic in a cleaner way. The document shows how the same asynchronous action can be rewritten using Redux Saga effects like put(), call(), and takeEvery() within generator functions. Overall, the key points are that Redux Saga encapsulates side effects, has a more readable syntax than Redux Thunk, and makes asynchronous workflows easier to test.
React is a JavaScript library for building user interfaces. It is not a full framework and only handles the view layer. React uses a component-based approach where UI is broken into independent, reusable pieces. Components render HTML and have their own internal state. This makes components predictable and easier to debug. However, React alone is not enough to build full applications and must be used with other libraries for functionality like data fetching and routing. While React takes more time to learn initially, it can improve development speed and code quality for larger teams through its patterns and emphasis on component design.
The document discusses React's virtual DOM and how it allows for more efficient DOM updates compared to directly manipulating the real DOM. It explains that the virtual DOM is an in-memory representation of the real DOM that allows React to calculate efficient DOM changes before applying them to the real DOM. This avoids unnecessary re-renders and improves performance. It also describes how React uses a diff algorithm and DOM traversal with breadth-first search to determine the minimal number of operations needed to transform the virtual DOM before updating the real DOM in a batched way.
Intro To React Native
with Varun Vachhar
OVERVIEW
React Native introduces a new way to write native mobile apps. You can take everything that you know and love about React and apply it to native apps. Unlike hybrid apps, it gives you access to both native APIs and UI components. The application logic uses JavaScript whereas, the UI is fully native! It also brings the best of the web to native, things like – flexbox layout model, XMLHttpRequest, requestAnimationFrame, etc.
OBJECTIVE
To introduce the audience to React Native. Show how they can leverage their knowledge of web development to build native apps.
TARGET AUDIENCE
Developers familiar with React who are interested in building native mobile apps.
ASSUMED AUDIENCE KNOWLEDGE
Basic knowledge of React, ES6 and CSS.
FIVE THINGS AUDIENCE MEMBERS WILL LEARN
What is React Native
How it is an extension of hybrid
How to use polyfills to leverage the best of the web while getting native performance
How to debug React Native apps
How to use Flexbox and CSS for styling a React Native app
The document discusses React Native and GraphQL. It introduces React Native as a way to build native mobile apps using React and JavaScript. GraphQL is presented as an alternative to REST and OData for mobile backends by allowing clients to specify the data structure needed and supporting relationships between data. The document demonstrates GraphQL queries using an online IDE and AWS AppSync as an option for building GraphQL backends with features like subscriptions and offline support.
This document provides an introduction to ReactJS, including:
- Why React is simple, declarative, and allows building of composable components
- React's popularity, with over 900,000 downloads in the last month
- How React addresses issues with traditional web development through its use of virtual DOM and componentization
- An example component is demonstrated to show how to: render in JSX, make components dynamic and interactive through props and event handling, access the DOM through refs, and manage state.
React is a declarative, efficient, and flexible JavaScript library for building user interfaces. It uses virtual DOM which improves performance and can render on both client and server. React encourages a component-based approach where UI is broken into independent reusable pieces that accept external data through properties. Components manage their own state which allows the UI to update over time in response to user input. This makes React code more predictable and easier to debug than traditional two-way data binding.
React js is a JavaScript library created by Facebook in 2013 for building user interfaces and rendering UI components. It uses a virtual DOM to efficiently update the real DOM and allow building of reusable UI components. React code can be written directly in HTML or using JSX syntax and by setting up a React app with Node.js and NPM. Components are the building blocks of React and can be class or function based. Props and state allow passing data to components and re-rendering components on state changes.
Redux Toolkit is a library that simplifies state management with Redux. It provides utilities that help with common Redux use cases like creating reducers and actions. The presentation introduces Redux and state management concepts, shows how Redux Toolkit simplifies common Redux patterns, and demonstrates a demo implementation using Redux Toolkit with inspection in Redux DevTools.
React is a JavaScript library for building user interfaces that uses a virtual DOM for improved performance. It uses a one-way data flow and declarative components. The virtual DOM allows React to efficiently update the real DOM by only making necessary changes. Components in React encapsulate elements and can have state and props. JSX is recommended for writing React components and compiles to plain JavaScript.
Components are the building blocks of React applications. There are two main types of components: functional components and class components. Functional components are simple functions that return JSX and are stateless, while class components extend React.Component and can hold state and lifecycle methods. Other component types include pure components and high-order components. Components are independent and reusable code used to build up the UI of a React application from smaller parts.
This document provides an introduction to React and Redux. It defines a single-page application as one that works within a browser without page reloads. React is introduced as a JavaScript library for building user interfaces using components with one-way data flow and a virtual DOM. Redux is a tool for managing application state that uses a single store, immutable state changes via actions, and pure reducer functions. The document also explains how React and Redux are integrated using the React Redux library and connect function. Key concepts such as JSX, props, state, lifecycle methods and the three principles of Redux are summarized.
State management in React applications using Redux.
1. Intro to redux
2. Build a redux app without any UI
3. React-Redux app using connect
4. state vs props
5. Live coding a todo app using react and redux
6. reselect
7. react prop types validation
8. Learn and understand react redux
The document summarizes Kiran Abburi's presentation on React. It covers:
1. The agenda includes basics of React, composition, data flow, JSX, React APIs, and building a todo app.
2. React is a JavaScript library for building user interfaces and uses a component-based approach to build encapsulated pieces.
3. Data in React flows in a uni-directional way through properties (props) and state, where props are passed from parent to child components and state is internal to a component.
Plain React detects changes by re-rendering your whole UI into a virtual DOM and then comparing it to the old version. Whatever changed, gets patched to the real DOM.
React (or React Js) is a declarative, component-based JS library to build SPA(single page applications) which was created by Jordan Walke, a software engineer at Facebook. It is flexible and can be used in a variety of projects.
This session will be about maintaning the store on client side with redux, And will have more details about state management addressing single source of truth concept
When developing applications we have a hard time managing application state, and that is okay because managing application state is hard. We will try to make it easier using Redux.
Redux is predictable state management container for JavaScript applications that helps us manage our state while also making our state mutations predictable.
Through the presentation and code, I will show you how I solved my state problem with Redux in React application.
This document provides an introduction to React.js, including:
- React is a JavaScript library for building user interfaces and was developed by Facebook. It is the VIEW component in MVC architecture.
- Key features and benefits of React include being fast, modular, scalable, flexible, and popular due to its employability. Large companies like Facebook use React.
- Core concepts of React include JSX, components, unidirectional data flow, and the virtual DOM which improves performance compared to traditional frameworks. Components are reusable pieces that make up the entire application.
The document provides an introduction to React, a JavaScript library for building user interfaces. It discusses key React concepts like components, properties, state, one-way data flow, and JSX syntax. It also covers setting up a development environment with Create React App and shows how to create a basic React component with state. The target audience appears to be people new to React who want to learn the fundamentals.
The document provides an overview of state management in Angular using NgRx. It discusses setting up the store and reducers, accessing state in components, using selectors, handling asynchronous operations with effects, improving data persistence with NX, and connecting related data models. The key steps covered include creating interfaces and initial state, setting up the reducer, importing modules, dispatching actions, using entity adapters for collections, and composing selectors.
This document provides an overview and explanation of React Hooks. It introduces common Hooks like useState, useEffect, useReducer, and custom hooks. useState is used to add local state to functional components. useEffect is similar to component lifecycle methods and lets you perform side effects. useReducer is an alternative to useState for managing state in a single object. Custom hooks let you extract reusable logic and share it without changing components. The document also includes a FAQ addressing questions about hooks and class components.
ReactJS for Beginners provides an overview of ReactJS including what it is, advantages, disadvantages, typical setup tools, and examples of basic React code. Key points covered include:
- ReactJS is a JavaScript library for building user interfaces and is component-based.
- Advantages include high efficiency, easier JavaScript via JSX, good developer tools and SEO, and easy testing.
- Disadvantages include React only handling the view layer and requiring other libraries for full MVC functionality.
- Examples demonstrate basic components, properties, events, conditional rendering, and lists in ReactJS.
The document discusses React hooks and how they can be used to manage state and other features in function components without writing classes. It provides examples of how common lifecycle methods and state management in classes can be re-written using hooks like useState, useEffect, and useContext. Specifically, it walks through converting a chat component that subscribes to new messages and manages local state from a class to a function component using these React hooks.
Hello everyone👋 Ankit this side, I hope you are doing great.
So I am planning for another session on Understanding states In Jetpack compose ( 0 to 🚀)
[
we update data on UI components in compose,
Stateful and stateless, and State Hoisting (How to do hoisting in compose),
Info about remember, mutable state and etc.
]
First lecture in the Java EE training course.
Covers:
- Java EE project setup
- Introduction to Maven
- Web application structure
- JSF basics
- CDI basics
React is a declarative, efficient, and flexible JavaScript library for building user interfaces. It uses virtual DOM which improves performance and can render on both client and server. React encourages a component-based approach where UI is broken into independent reusable pieces that accept external data through properties. Components manage their own state which allows the UI to update over time in response to user input. This makes React code more predictable and easier to debug than traditional two-way data binding.
React js is a JavaScript library created by Facebook in 2013 for building user interfaces and rendering UI components. It uses a virtual DOM to efficiently update the real DOM and allow building of reusable UI components. React code can be written directly in HTML or using JSX syntax and by setting up a React app with Node.js and NPM. Components are the building blocks of React and can be class or function based. Props and state allow passing data to components and re-rendering components on state changes.
Redux Toolkit is a library that simplifies state management with Redux. It provides utilities that help with common Redux use cases like creating reducers and actions. The presentation introduces Redux and state management concepts, shows how Redux Toolkit simplifies common Redux patterns, and demonstrates a demo implementation using Redux Toolkit with inspection in Redux DevTools.
React is a JavaScript library for building user interfaces that uses a virtual DOM for improved performance. It uses a one-way data flow and declarative components. The virtual DOM allows React to efficiently update the real DOM by only making necessary changes. Components in React encapsulate elements and can have state and props. JSX is recommended for writing React components and compiles to plain JavaScript.
Components are the building blocks of React applications. There are two main types of components: functional components and class components. Functional components are simple functions that return JSX and are stateless, while class components extend React.Component and can hold state and lifecycle methods. Other component types include pure components and high-order components. Components are independent and reusable code used to build up the UI of a React application from smaller parts.
This document provides an introduction to React and Redux. It defines a single-page application as one that works within a browser without page reloads. React is introduced as a JavaScript library for building user interfaces using components with one-way data flow and a virtual DOM. Redux is a tool for managing application state that uses a single store, immutable state changes via actions, and pure reducer functions. The document also explains how React and Redux are integrated using the React Redux library and connect function. Key concepts such as JSX, props, state, lifecycle methods and the three principles of Redux are summarized.
State management in React applications using Redux.
1. Intro to redux
2. Build a redux app without any UI
3. React-Redux app using connect
4. state vs props
5. Live coding a todo app using react and redux
6. reselect
7. react prop types validation
8. Learn and understand react redux
The document summarizes Kiran Abburi's presentation on React. It covers:
1. The agenda includes basics of React, composition, data flow, JSX, React APIs, and building a todo app.
2. React is a JavaScript library for building user interfaces and uses a component-based approach to build encapsulated pieces.
3. Data in React flows in a uni-directional way through properties (props) and state, where props are passed from parent to child components and state is internal to a component.
Plain React detects changes by re-rendering your whole UI into a virtual DOM and then comparing it to the old version. Whatever changed, gets patched to the real DOM.
React (or React Js) is a declarative, component-based JS library to build SPA(single page applications) which was created by Jordan Walke, a software engineer at Facebook. It is flexible and can be used in a variety of projects.
This session will be about maintaning the store on client side with redux, And will have more details about state management addressing single source of truth concept
When developing applications we have a hard time managing application state, and that is okay because managing application state is hard. We will try to make it easier using Redux.
Redux is predictable state management container for JavaScript applications that helps us manage our state while also making our state mutations predictable.
Through the presentation and code, I will show you how I solved my state problem with Redux in React application.
This document provides an introduction to React.js, including:
- React is a JavaScript library for building user interfaces and was developed by Facebook. It is the VIEW component in MVC architecture.
- Key features and benefits of React include being fast, modular, scalable, flexible, and popular due to its employability. Large companies like Facebook use React.
- Core concepts of React include JSX, components, unidirectional data flow, and the virtual DOM which improves performance compared to traditional frameworks. Components are reusable pieces that make up the entire application.
The document provides an introduction to React, a JavaScript library for building user interfaces. It discusses key React concepts like components, properties, state, one-way data flow, and JSX syntax. It also covers setting up a development environment with Create React App and shows how to create a basic React component with state. The target audience appears to be people new to React who want to learn the fundamentals.
The document provides an overview of state management in Angular using NgRx. It discusses setting up the store and reducers, accessing state in components, using selectors, handling asynchronous operations with effects, improving data persistence with NX, and connecting related data models. The key steps covered include creating interfaces and initial state, setting up the reducer, importing modules, dispatching actions, using entity adapters for collections, and composing selectors.
This document provides an overview and explanation of React Hooks. It introduces common Hooks like useState, useEffect, useReducer, and custom hooks. useState is used to add local state to functional components. useEffect is similar to component lifecycle methods and lets you perform side effects. useReducer is an alternative to useState for managing state in a single object. Custom hooks let you extract reusable logic and share it without changing components. The document also includes a FAQ addressing questions about hooks and class components.
ReactJS for Beginners provides an overview of ReactJS including what it is, advantages, disadvantages, typical setup tools, and examples of basic React code. Key points covered include:
- ReactJS is a JavaScript library for building user interfaces and is component-based.
- Advantages include high efficiency, easier JavaScript via JSX, good developer tools and SEO, and easy testing.
- Disadvantages include React only handling the view layer and requiring other libraries for full MVC functionality.
- Examples demonstrate basic components, properties, events, conditional rendering, and lists in ReactJS.
The document discusses React hooks and how they can be used to manage state and other features in function components without writing classes. It provides examples of how common lifecycle methods and state management in classes can be re-written using hooks like useState, useEffect, and useContext. Specifically, it walks through converting a chat component that subscribes to new messages and manages local state from a class to a function component using these React hooks.
Hello everyone👋 Ankit this side, I hope you are doing great.
So I am planning for another session on Understanding states In Jetpack compose ( 0 to 🚀)
[
we update data on UI components in compose,
Stateful and stateless, and State Hoisting (How to do hoisting in compose),
Info about remember, mutable state and etc.
]
First lecture in the Java EE training course.
Covers:
- Java EE project setup
- Introduction to Maven
- Web application structure
- JSF basics
- CDI basics
Tutorial Videos: https://www.youtube.com/playlist?list=PLD8nQCAhR3tQ7KXnvIk_v_SLK-Fb2y_k_
Day 1 : Introduction to React, Babel and Webpack
Prerequisites of starting the workshop ( Basic understanding of Node & Express )
What is Virtual DOM?
What is React and why should we use it?
Install and set up React:
a-Using create-react-app
b-From scratch using Babel and Webpack. We will use Webpack Dev Server.
Day 2 : React Basic Concepts
Types of Components: Class-based and Functional based Components
Use of JSX
Parent, Child, and Nested Components
Difference between State and Props
Create and Handle Routes
Component Lifecycle Methods
Create a form and handling form inputs
Use of arrow functions and Spread Operator
Day 3: Advanced Concepts in React
Use of Refs
What are Higher Order Components( HOC )?
How to use HOC
Understanding Context in React
Presentation on "An Introduction to ReactJS"Flipkart
The PowerPoint presentation titled "An Introduction to ReactJS" provides a beginner-friendly overview of ReactJS, a popular JavaScript library used for building user interfaces. This presentation aims to introduce ReactJS to individuals who may not have prior technical knowledge or experience with web development.
The presentation begins with a brief introduction to ReactJS, explaining that it is a JavaScript library created by Facebook for building interactive and dynamic user interfaces. It highlights ReactJS's key features, such as component-based architecture and virtual DOM.
Next, the presentation focuses on the benefits of using ReactJS. It explains that ReactJS enhances the user experience by enabling the creation of highly responsive and efficient web applications. It emphasizes React's ability to manage complex UI components and handle data updates seamlessly.
To make the concept more relatable, the presentation provides real-world examples of popular websites and applications that use ReactJS. This helps the audience understand how ReactJS is implemented in real-world scenarios and its impact on user interface development.
Furthermore, the presentation covers the basic concepts of ReactJS, such as components, props, and state. It explains that ReactJS follows a modular approach, where the UI is divided into reusable components, making it easier to manage and update the application. It also gives a high-level overview of how props and state are used to manage data flow within React components.
Throughout the presentation, visual aids such as diagrams, screenshots, and simple illustrations are used to enhance understanding and engage the audience. The focus is on simplifying complex concepts and making them accessible to non-technical individuals.
Finally, the presentation concludes by highlighting the vast community support and resources available for learning ReactJS. It encourages the audience to explore further and provides recommendations for online tutorials, documentation, and learning platforms.
Overall, the "An Introduction to ReactJS" PowerPoint presentation aims to provide a non-technical audience with a basic understanding of ReactJS, its benefits, and its relevance in modern web development.
This document provides an overview of several core technologies used in React applications, including React, Flux, Node.js, Browserify, and Gulp. It discusses that React is a JavaScript library for building user interfaces and rendering UI as HTML. It uses virtual DOM for efficient updates. Flux is an architecture for uni-directional data flow. Node.js is used for server-side JavaScript with npm. Browserify allows using Node modules in the browser. Gulp is a build system for tasks like bundling files.
GITS Class #20: Building A Fast and Responsive UI in React NativeGITS Indonesia
Pada Desember 2019, berlangsung GITS Class #20, seminar gratis dan terbuka untuk umum, di kantor GITS Indonesia. Topik, salah satu iOS developer di GITS Indonesia membawakan materi yang lebih general tak hanya untuk pemograman iOS, yakni mengenai React Native.
Follow akun GITS Indonesia untuk mendapatkan info terkait event seru selanjutnya!
Instagram: @gitsindonesia
Twitter: @gitsindonesia
Facebook: GITS Indonesia
Medium: GITS Apps Insight
YouTube: GITS Indonesia
LinkedIn: GITS Indonesia
Website: https://gits.id/
React and Flux life cycle with JSX, React Router and Jest Unit TestingEswara Kumar Palakollu
Understanding of React, JSX, Flux, react-router and Jest for React and Flux Unit Testing.
Detailed view of react life cycle and flux life cycle along with React life cycle.
React with MVC pattern and React + Flux with MVC pattern explained.
Reactive state management with Jetpack ComponentsGabor Varadi
This talk explains what problems exist in the context of Android application development, how Jetpack components such as SavedStateHandle help handle that, and how we can combine observable values to expose our state, to be observed only when it is needed.
The document discusses React hooks and class-based components. It begins by explaining that class-based components are used to define state and lifecycle methods, while functional components cannot define state or lifecycle methods. It then walks through building a sample Todo list app first with classes, then refactoring it to use React hooks instead. The useState hook is used to replace class component state, and useEffect replaces lifecycle methods. Overall the document provides an introduction and example of how to transition a class-based React component to use hooks.
At Lia Infraservice we create Dynamic Websites. Become a front-end React JS developer and be a part of our tech-savvy Web App Development Company in Chennai.
React Basics
- What is Virtual DOM?
- What is React and why should we use it?
- Types of Components: Class-based and Functional based Components
- Use of JSX
- Parent, Child, and Nested Components
- Difference between State and Props
- Component Lifecycle Methods
- Handling form events and input.
This document provides an overview of the Redux framework for managing state in JavaScript applications. It discusses key Redux concepts like single source of truth, immutable state, pure reducer functions, stores, actions, and combining reducers. It also covers integrating Redux with React and asynchronous operations. The document outlines the course content which will cover these Redux fundamentals and patterns for using Redux with React and asynchronous logic.
React state management and side-effects – A Review of HooksIRJET Journal
This document provides a review of React state management and side effects using Hooks. It begins with an introduction to Hooks and their advantages over classes for managing state and side effects in React components. It then discusses the useState Hook for introducing stateful logic without classes. Next, it covers the useEffect Hook for performing side effects like data fetching and subscriptions. It provides examples of how to use these Hooks to manage component state and logic. In conclusion, it states that Hooks allow for efficient state management and side effects in React components without interfering with rendering.
ReactJS Component Lifecycle hooks with examples Ravi Mone
The document discusses ReactJS component lifecycle hooks and their order of execution:
1. GetDefaultProps and GetInitialState are called once on initialization.
2. ComponentWillMount, Render, and ComponentDidMount are called on initial render in that order.
3. On subsequent renders, ComponentWillReceiveProps, ShouldComponentUpdate, ComponentWillUpdate, ComponentDidUpdate are called in that order to determine if re-rendering is needed.
4. ComponentWillUnmount is called once before the component is removed from the DOM.
Fundamental Concepts of React JS for Beginners.pdfStephieJohn
React is a JavaScript library for building user interfaces using components. Components are reusable pieces of code that present UI and can be functions or classes. Class components provide key functions like state that function components lack. Components break down complex UIs into independent and reusable pieces. The document then covers fundamental React concepts like getting started, component structure, state, rendering components, and the component lifecycle.
The document discusses the life cycle of a React component which is divided into four stages:
1) Initialization - When the component is initialized with default props and state.
2) Mounting - When the component is rendered in the DOM and componentDidMount is called.
3) Update - When the DOM is interacted with by the user and methods like shouldComponentUpdate and componentDidUpdate are called.
4) Unmounting - When the component is removed from the DOM and componentWillUnmount is called.
This document provides an overview of ReactJS including installing ReactJS, configuring ReactJS locally and via CDN, what JSX is, creating custom components with JSX, ReactJS event handling, lifecycle, stateful components, precompiling JSX, developing a digital clock, and debugging ReactJS. It also discusses the ReactJS initialization, lifetime, and teardown phases and provides an example of the component lifecycle.
React JS is a JavaScript library for building user interfaces. It uses a virtual DOM to efficiently update the real DOM and render user interfaces from components. Components are reusable pieces of UI that accept input data via properties but maintain private state data. The lifecycle of a component involves initialization, updating due to state/prop changes, and unmounting. React uses a single-directional data flow and the concept of components makes code modular and reusable.
Honeypots Unveiled: Proactive Defense Tactics for Cyber Security, Phoenix Sum...APNIC
Adli Wahid, Senior Internet Security Specialist at APNIC, delivered a presentation titled 'Honeypots Unveiled: Proactive Defense Tactics for Cyber Security' at the Phoenix Summit held in Dhaka, Bangladesh from 23 to 24 May 2024.
Securing BGP: Operational Strategies and Best Practices for Network Defenders...APNIC
Md. Zobair Khan,
Network Analyst and Technical Trainer at APNIC, presented 'Securing BGP: Operational Strategies and Best Practices for Network Defenders' at the Phoenix Summit held in Dhaka, Bangladesh from 23 to 24 May 2024.
Decentralized Justice in Gaming and EsportsFederico Ast
Discover how Kleros is transforming the landscape of dispute resolution in the gaming and eSports industry through the power of decentralized justice.
This presentation, delivered by Federico Ast, CEO of Kleros, explores the innovative application of blockchain technology, crowdsourcing, and incentivized mechanisms to create fair and efficient arbitration processes.
Key Highlights:
- Introduction to Decentralized Justice: Learn about the foundational principles of Kleros and how it combines blockchain with crowdsourcing to develop a novel justice system.
- Challenges in Traditional Arbitration: Understand the limitations of conventional arbitration methods, such as high costs and long resolution times, particularly for small claims in the gaming sector.
- How Kleros Works: A step-by-step guide on the functioning of Kleros, from the initiation of a smart contract to the final decision by a jury of peers.
- Case Studies in eSports: Explore real-world scenarios where Kleros has been applied to resolve disputes in eSports, including issues like cheating, governance, player behavior, and contractual disagreements.
- Practical Implementation: Detailed walkthroughs of how disputes are handled in eSports tournaments, emphasizing speed, cost-efficiency, and fairness.
- Enhanced Transparency: The role of blockchain in providing an immutable and transparent record of proceedings, ensuring trust in the resolution process.
- Future Prospects: The potential expansion of decentralized justice mechanisms across various sectors within the gaming industry.
For more information, visit kleros.io or follow Federico Ast and Kleros on social media:
• Twitter: @federicoast
• Twitter: @kleros_io
1. Manage React State with
Recoil
Yoni Weisbrod
Lemonade Frontend Guild, Sept. 2020
2. Recoil in brief
- State manager by Facebook
- Some of the API is still unstable 🚧
- Strong integration with React
(e.g. hooks & Suspense)
Docs at https://recoiljs.org/
11. - State is consumed using built-in hooks (e.g.
useRecoilState, useRecoilValue, useSetRecoilState,
etc.)
- Each hook has an appropriate use case.
Recoil in Action: Consuming State
12. Recoil in Action: Consuming State
- State is consumed using built-in hooks (e.g.
useRecoilState, useRecoilValue, useSetRecoilState,
etc.)
- Each hook has an appropriate use case.
- atoms and selectors cannot be consumed directly.
13. - State is consumed using built-in hooks
⚠️ Limitation: Only React components can consume Recoil state.
Recoil in Action: Consuming State
14. Hook #1: useRecoilState
● Most similar to useState (provides getter and setter objects)
● Triggers a re-render when subscribed atom/selector changes
Recoil is a state manager built internally at Facebook.
It’s still experimental - meaning some of the API is in flux.
Stability - can I use it in production? Much of the API is fine, stable. But some parts of it are still unstable. I would not build a business around it just yet personally, as it’s still nowhere near version 1. Currently at v0.0.12.
Dependent on React - can’t be used outside
Don’t have to wrap entire app with RecoilRoot - can use it on a specific node.
Wrap outer node
Regular React useState
Regular React useState
Only 2 changes -
We’ve added a state object (an atom)
We’ve changed useState to useRecoilState
LIFTS state out of view
Selectors
Similar to Redux selectors -> way to get derived data
Keeps data always fresh
Analogy - spreadsheet.
React components - including custom hooks. Meaning you can’t consume state inside a regular JS function, like you can with MobX. This is a limitation of Recoil - it lifts state out of components, but not outside React.
Only 2 changes -
We’ve added a state object (an atom)
We’ve changed useState to useRecoilState
Egghead lesson - https://egghead.io/lessons/react-choose-the-right-hook-for-your-recoil-state
Fork sandbox, start with useState, then go to the rest.
Async selectors - can be used to make API calls, DB queries, etc. Why? Keeps state up to date.
Could also just use useEffect to make API calls based on Reactions.
Async selectors - can be used to make API calls, DB queries, etc. Why? Keeps state up to date.
Could also just use useEffect to make API calls based on Reactions.
Only 2 changes -
We’ve added a state object (an atom)
We’ve changed useState to useRecoilState
Only 2 changes -
We’ve added a state object (an atom)
We’ve changed useState to useRecoilState
Only 2 changes -
We’ve added a state object (an atom)
We’ve changed useState to useRecoilState
Only 2 changes -
We’ve added a state object (an atom)
We’ve changed useState to useRecoilState
Cons: Local (not cross-application, so you can’t leverage the lifting out of state of Recoil)
Pros: Not cached… (explain in next slide)
Cons: CACHED!! Good for avatars, etc.
Pros: Can be shared across app