This document discusses React component lifecycles and how React performs efficient re-renders. It explains the different lifecycle methods like componentWillMount, componentDidMount, etc. It then discusses how React batches state updates and only re-renders components when necessary using techniques like shouldComponentUpdate. It also explains React's reconciliation algorithm which intelligently updates the DOM by diffing virtual DOM trees in an efficient way when keys are provided. Overall the document provides an overview of key techniques React uses to optimize re-rendering for performance.
This is the first half of a presentation I gave at Squares Conference 2015 where I provided a brief introduction to React JS, then did live coding for 20 minutes to show more of the specifics of usage. Your milage may vary as the live code part was where the bulk of the teaching happened!
React is a different way to write JavaScript apps. When it was introduced at JSConf US in May, the audience was shocked by some of its design principles. One sarcastic tweet from an audience member ended up describing React’s philosophy quite accurately: https://twitter.com/cowboy/status/339858717451362304
We’re trying to push the limits of what’s possible on the web with React. My talk will start with a brief introduction to the framework, and then dive into three controversial topics: Throwing out the notion of templates and building views with JavaScript, “re-rendering” your entire application when your data changes, and a lightweight implementation of the DOM and events.
All Things Open 2014 - Day 2
Thursday, October 23rd, 2014
James Pearce
Head of Open Source with Facebook
Front Dev 1
An Introduction to ReactJS
Find more by James here: https://speakerdeck.com/jamesgpearce
Http Service will help us fetch external data, post to it, etc. We need to import the http module to make use of the http service. Let us consider an example to understand how to make use of the http service.
This is the first half of a presentation I gave at Squares Conference 2015 where I provided a brief introduction to React JS, then did live coding for 20 minutes to show more of the specifics of usage. Your milage may vary as the live code part was where the bulk of the teaching happened!
React is a different way to write JavaScript apps. When it was introduced at JSConf US in May, the audience was shocked by some of its design principles. One sarcastic tweet from an audience member ended up describing React’s philosophy quite accurately: https://twitter.com/cowboy/status/339858717451362304
We’re trying to push the limits of what’s possible on the web with React. My talk will start with a brief introduction to the framework, and then dive into three controversial topics: Throwing out the notion of templates and building views with JavaScript, “re-rendering” your entire application when your data changes, and a lightweight implementation of the DOM and events.
All Things Open 2014 - Day 2
Thursday, October 23rd, 2014
James Pearce
Head of Open Source with Facebook
Front Dev 1
An Introduction to ReactJS
Find more by James here: https://speakerdeck.com/jamesgpearce
Http Service will help us fetch external data, post to it, etc. We need to import the http module to make use of the http service. Let us consider an example to understand how to make use of the http service.
React Js Basic Details and Descriptions
Frontend Javascript Library, to make decent SPA
The fastest way to build a segregated component based front end for software development.
Validating user input for accuracy and completeness helps in improving overall data quality. Angular and its form package turns up with a Validators class that has some beneficial validators like minLength, maxLength, required and pattern. However, occasionally if we wish to validate different fields under more complex/custom rules we can make optimum use of custom validator.
Defining custom validators while using Reactive Forms in Angular comes very easy as they are more of regular functions. One can conveniently generate function for custom validators within the component file in case the validator is not supposed to be used elsewhere.
Presentation about new Angular 9.
It gives introduction about angular framework.
Provides information about why we use angular,
additional features and fixes from old versions. It will clearly explain how to create a new angular project and how to use angular commands and their usages.
It will also explain about the key components like angular architecture, routing, dependency injection etc.,
ReactJS is arguably the most popular Javascript framework around for web development today. With more and more teams exploring and adopting React, here is TechTalks presentation elaborating fundamentals of React, in a code along session
NextJS - Online Summit for Frontend Developers September 2020Milad Heydari
Developers may think launching SSR application with react must be painful. In this talk, i was describe a simple SSR method, does a deep dive into SSR with Next.js, and how i using it. it's about some useful tips about challenges, optimizations, writing clean codes beside do’s and don’ts in Next.js and cover many of the Next.js features to accomplish a great website application with acceptable performance and speed.
React Global Online Summit for Frontend Developers.
September 2020
https://react.geekle.us/september-2020
https://youtu.be/fkp5_5rezsE
React Js Basic Details and Descriptions
Frontend Javascript Library, to make decent SPA
The fastest way to build a segregated component based front end for software development.
Validating user input for accuracy and completeness helps in improving overall data quality. Angular and its form package turns up with a Validators class that has some beneficial validators like minLength, maxLength, required and pattern. However, occasionally if we wish to validate different fields under more complex/custom rules we can make optimum use of custom validator.
Defining custom validators while using Reactive Forms in Angular comes very easy as they are more of regular functions. One can conveniently generate function for custom validators within the component file in case the validator is not supposed to be used elsewhere.
Presentation about new Angular 9.
It gives introduction about angular framework.
Provides information about why we use angular,
additional features and fixes from old versions. It will clearly explain how to create a new angular project and how to use angular commands and their usages.
It will also explain about the key components like angular architecture, routing, dependency injection etc.,
ReactJS is arguably the most popular Javascript framework around for web development today. With more and more teams exploring and adopting React, here is TechTalks presentation elaborating fundamentals of React, in a code along session
NextJS - Online Summit for Frontend Developers September 2020Milad Heydari
Developers may think launching SSR application with react must be painful. In this talk, i was describe a simple SSR method, does a deep dive into SSR with Next.js, and how i using it. it's about some useful tips about challenges, optimizations, writing clean codes beside do’s and don’ts in Next.js and cover many of the Next.js features to accomplish a great website application with acceptable performance and speed.
React Global Online Summit for Frontend Developers.
September 2020
https://react.geekle.us/september-2020
https://youtu.be/fkp5_5rezsE
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.
ΟΑΕΔ, Εγκύκλιος 16435/02.03.2017: Εγγεγραμμένοι άνεργοι στο μητρώο του ΟΑΕΔ και συμμετοχή σε προγράμματα εκπαίδευσης ή επαγγελματικής κατάρτισης - νέες ρυθμίσεις βάσει του άρθρου 56 του ν. 4430/2016.
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.
In this talk we will explore how to organize component-centric code splitting with server side rendering and universal data fetching in React, when your application becomes large enough.
Talk description: When you have a large enough application, a single large bundle with all of your code becomes a problem for startup time. You need to start breaking your app into separate bundles and load them dynamically when needed.
How to split a single bundle into multiple is a well-solved problem with tools like Browserify and Webpack.
But now you need to find places in your application where you can decide to split off into another bundle and load it asynchronously. You also need a way to communicate between server and client, and organize server side rendering and implement universal data fetching for your application.
Even React Router team failed with this task
“We’ve tried and failed a couple of times”(https://reacttraining.com/react-router/web/guides/code-splitting/code-splitting-server-rendering)
I will show you how to solve this problem, we will use a great library called React Loadable.
Also, we will look at some solutions which you can achieve with React Router v4 and why they are not the best one.
For this talk, you will need some knowledge in React, Babel (ES6), Node, Webpack 2, Redux, and little bit React Router v4.
React is a JavaScript library for building user interfaces. It is maintained by Facebook and a community of individual developers and companies. React can be used as a base in the development of single-page or mobile application
Hastening React SSR - Web Performance San DiegoMaxime Najim
Hastening React SSR with component memoization and templatization: React is a best-of-breed UI component framework allowing WalmartLabs to build higher level components that can be shared and reused across pages and apps. In this presentation, Max Najim and Naga Malepati from WalmartLabs will peel through the React codebase to add a component caching/memoization optimization. The will use a require(..) hook to inject their optimization while avoiding the need to fork the React codebase. And, they will review the caching optimization.
Introduction to React in combination with Redux. Redux helps you to develop applications in a simple way while having features like time-travel available during development.
Painless Migrations from Backbone to React/ReduxJim Sullivan
There are plenty of books, tutorials, and tools to help you start a brand new React project. But what if you already have a large application written in a legacy framework and you want to migrate to React? You can’t have your whole team drop everything and spend months rewriting your entire front end codebase. Jim will talk about challenges faced and solutions used by Conductor as they iteratively migrate to React from a large, complex, legacy Backbone app.
Intro deck on React, presented at the Ottawa JS Sept. 2015 meetup.
Github repo for the Poop Monitor app: https://github.com/blefebvre/react-poop-monitor
Deck was built with Spectacle: https://github.com/FormidableLabs/spectacle
Source: https://github.com/blefebvre/react-ottawajs-spectacle-deck
Fundamental Concepts of React JS for Beginners.pdfStephieJohn
Let’s look into the Fundamental concepts of React Js for beginners by Lia Infraservices – The top Mobile App Development Company in Chennai. React is a front-end open source JavaScript library for creating user interfaces (UI) components. Complex user interfaces are broken down into small “components,” which are separate pieces of “reusable codes”.
EWD 3 Training Course Part 37: Building a React.js application with ewd-xpres...Rob Tweed
This is part 37 of the EWD 3 Training Course. This presentation introduces and and begins to explore how to develop a React.js application that integrates with QEWD
In 2013, Facebook released a new JavaScript framework which would soon be adopted by loads of companies to build complex Front-End web applications. React is now mature, a great community quickly formed and produced by-products and extension like Redux or React Native. This workshop aims at showcasing the basics of React and discuss when choosing it the most relevant.
Pre-requisites:
A beginner's knowledge on vanilla JavaScript & the DOM. This is not a JavaScript 101 for absolute beginners.
Le Wagon React track is now open in London and Paris, apply now: https://www.lewagon.com/react
A Study of Variable-Role-based Feature Enrichment in Neural Models of CodeAftab Hussain
Understanding variable roles in code has been found to be helpful by students
in learning programming -- could variable roles help deep neural models in
performing coding tasks? We do an exploratory study.
- These are slides of the talk given at InteNSE'23: The 1st International Workshop on Interpretability and Robustness in Neural Software Engineering, co-located with the 45th International Conference on Software Engineering, ICSE 2023, Melbourne Australia
Globus Connect Server Deep Dive - GlobusWorld 2024Globus
We explore the Globus Connect Server (GCS) architecture and experiment with advanced configuration options and use cases. This content is targeted at system administrators who are familiar with GCS and currently operate—or are planning to operate—broader deployments at their institution.
GraphSummit Paris - The art of the possible with Graph TechnologyNeo4j
Sudhir Hasbe, Chief Product Officer, Neo4j
Join us as we explore breakthrough innovations enabled by interconnected data and AI. Discover firsthand how organizations use relationships in data to uncover contextual insights and solve our most pressing challenges – from optimizing supply chains, detecting fraud, and improving customer experiences to accelerating drug discoveries.
First Steps with Globus Compute Multi-User EndpointsGlobus
In this presentation we will share our experiences around getting started with the Globus Compute multi-user endpoint. Working with the Pharmacology group at the University of Auckland, we have previously written an application using Globus Compute that can offload computationally expensive steps in the researcher's workflows, which they wish to manage from their familiar Windows environments, onto the NeSI (New Zealand eScience Infrastructure) cluster. Some of the challenges we have encountered were that each researcher had to set up and manage their own single-user globus compute endpoint and that the workloads had varying resource requirements (CPUs, memory and wall time) between different runs. We hope that the multi-user endpoint will help to address these challenges and share an update on our progress here.
Navigating the Metaverse: A Journey into Virtual Evolution"Donna Lenk
Join us for an exploration of the Metaverse's evolution, where innovation meets imagination. Discover new dimensions of virtual events, engage with thought-provoking discussions, and witness the transformative power of digital realms."
Enterprise Resource Planning System includes various modules that reduce any business's workload. Additionally, it organizes the workflows, which drives towards enhancing productivity. Here are a detailed explanation of the ERP modules. Going through the points will help you understand how the software is changing the work dynamics.
To know more details here: https://blogs.nyggs.com/nyggs/enterprise-resource-planning-erp-system-modules/
Essentials of Automations: The Art of Triggers and Actions in FMESafe Software
In this second installment of our Essentials of Automations webinar series, we’ll explore the landscape of triggers and actions, guiding you through the nuances of authoring and adapting workspaces for seamless automations. Gain an understanding of the full spectrum of triggers and actions available in FME, empowering you to enhance your workspaces for efficient automation.
We’ll kick things off by showcasing the most commonly used event-based triggers, introducing you to various automation workflows like manual triggers, schedules, directory watchers, and more. Plus, see how these elements play out in real scenarios.
Whether you’re tweaking your current setup or building from the ground up, this session will arm you with the tools and insights needed to transform your FME usage into a powerhouse of productivity. Join us to discover effective strategies that simplify complex processes, enhancing your productivity and transforming your data management practices with FME. Let’s turn complexity into clarity and make your workspaces work wonders!
Understanding Globus Data Transfers with NetSageGlobus
NetSage is an open privacy-aware network measurement, analysis, and visualization service designed to help end-users visualize and reason about large data transfers. NetSage traditionally has used a combination of passive measurements, including SNMP and flow data, as well as active measurements, mainly perfSONAR, to provide longitudinal network performance data visualization. It has been deployed by dozens of networks world wide, and is supported domestically by the Engagement and Performance Operations Center (EPOC), NSF #2328479. We have recently expanded the NetSage data sources to include logs for Globus data transfers, following the same privacy-preserving approach as for Flow data. Using the logs for the Texas Advanced Computing Center (TACC) as an example, this talk will walk through several different example use cases that NetSage can answer, including: Who is using Globus to share data with my institution, and what kind of performance are they able to achieve? How many transfers has Globus supported for us? Which sites are we sharing the most data with, and how is that changing over time? How is my site using Globus to move data internally, and what kind of performance do we see for those transfers? What percentage of data transfers at my institution used Globus, and how did the overall data transfer performance compare to the Globus users?
Introducing Crescat - Event Management Software for Venues, Festivals and Eve...Crescat
Crescat is industry-trusted event management software, built by event professionals for event professionals. Founded in 2017, we have three key products tailored for the live event industry.
Crescat Event for concert promoters and event agencies. Crescat Venue for music venues, conference centers, wedding venues, concert halls and more. And Crescat Festival for festivals, conferences and complex events.
With a wide range of popular features such as event scheduling, shift management, volunteer and crew coordination, artist booking and much more, Crescat is designed for customisation and ease-of-use.
Over 125,000 events have been planned in Crescat and with hundreds of customers of all shapes and sizes, from boutique event agencies through to international concert promoters, Crescat is rigged for success. What's more, we highly value feedback from our users and we are constantly improving our software with updates, new features and improvements.
If you plan events, run a venue or produce festivals and you're looking for ways to make your life easier, then we have a solution for you. Try our software for free or schedule a no-obligation demo with one of our product specialists today at crescat.io
Enhancing Research Orchestration Capabilities at ORNL.pdfGlobus
Cross-facility research orchestration comes with ever-changing constraints regarding the availability and suitability of various compute and data resources. In short, a flexible data and processing fabric is needed to enable the dynamic redirection of data and compute tasks throughout the lifecycle of an experiment. In this talk, we illustrate how we easily leveraged Globus services to instrument the ACE research testbed at the Oak Ridge Leadership Computing Facility with flexible data and task orchestration capabilities.
OpenMetadata Community Meeting - 5th June 2024OpenMetadata
The OpenMetadata Community Meeting was held on June 5th, 2024. In this meeting, we discussed about the data quality capabilities that are integrated with the Incident Manager, providing a complete solution to handle your data observability needs. Watch the end-to-end demo of the data quality features.
* How to run your own data quality framework
* What is the performance impact of running data quality frameworks
* How to run the test cases in your own ETL pipelines
* How the Incident Manager is integrated
* Get notified with alerts when test cases fail
Watch the meeting recording here - https://www.youtube.com/watch?v=UbNOje0kf6E
Providing Globus Services to Users of JASMIN for Environmental Data AnalysisGlobus
JASMIN is the UK’s high-performance data analysis platform for environmental science, operated by STFC on behalf of the UK Natural Environment Research Council (NERC). In addition to its role in hosting the CEDA Archive (NERC’s long-term repository for climate, atmospheric science & Earth observation data in the UK), JASMIN provides a collaborative platform to a community of around 2,000 scientists in the UK and beyond, providing nearly 400 environmental science projects with working space, compute resources and tools to facilitate their work. High-performance data transfer into and out of JASMIN has always been a key feature, with many scientists bringing model outputs from supercomputers elsewhere in the UK, to analyse against observational or other model data in the CEDA Archive. A growing number of JASMIN users are now realising the benefits of using the Globus service to provide reliable and efficient data movement and other tasks in this and other contexts. Further use cases involve long-distance (intercontinental) transfers to and from JASMIN, and collecting results from a mobile atmospheric radar system, pushing data to JASMIN via a lightweight Globus deployment. We provide details of how Globus fits into our current infrastructure, our experience of the recent migration to GCSv5.4, and of our interest in developing use of the wider ecosystem of Globus services for the benefit of our user community.
Software Engineering, Software Consulting, Tech Lead, Spring Boot, Spring Cloud, Spring Core, Spring JDBC, Spring Transaction, Spring MVC, OpenShift Cloud Platform, Kafka, REST, SOAP, LLD & HLD.
Atelier - Innover avec l’IA Générative et les graphes de connaissancesNeo4j
Atelier - Innover avec l’IA Générative et les graphes de connaissances
Allez au-delà du battage médiatique autour de l’IA et découvrez des techniques pratiques pour utiliser l’IA de manière responsable à travers les données de votre organisation. Explorez comment utiliser les graphes de connaissances pour augmenter la précision, la transparence et la capacité d’explication dans les systèmes d’IA générative. Vous partirez avec une expérience pratique combinant les relations entre les données et les LLM pour apporter du contexte spécifique à votre domaine et améliorer votre raisonnement.
Amenez votre ordinateur portable et nous vous guiderons sur la mise en place de votre propre pile d’IA générative, en vous fournissant des exemples pratiques et codés pour démarrer en quelques minutes.
We describe the deployment and use of Globus Compute for remote computation. This content is aimed at researchers who wish to compute on remote resources using a unified programming interface, as well as system administrators who will deploy and operate Globus Compute services on their research computing infrastructure.
Graspan: A Big Data System for Big Code AnalysisAftab Hussain
We built a disk-based parallel graph system, Graspan, that uses a novel edge-pair centric computation model to compute dynamic transitive closures on very large program graphs.
We implement context-sensitive pointer/alias and dataflow analyses on Graspan. An evaluation of these analyses on large codebases such as Linux shows that their Graspan implementations scale to millions of lines of code and are much simpler than their original implementations.
These analyses were used to augment the existing checkers; these augmented checkers found 132 new NULL pointer bugs and 1308 unnecessary NULL tests in Linux 4.4.0-rc5, PostgreSQL 8.3.9, and Apache httpd 2.2.18.
- Accepted in ASPLOS ‘17, Xi’an, China.
- Featured in the tutorial, Systemized Program Analyses: A Big Data Perspective on Static Analysis Scalability, ASPLOS ‘17.
- Invited for presentation at SoCal PLS ‘16.
- Invited for poster presentation at PLDI SRC ‘16.
26. Batching
• Whenever you call setState on a component,
React will mark it as dirty. At the end of the event
loop, React looks at all the dirty components and
re-renders them.
• This batching means that during an event loop,
there is exactly one time when the DOM is being
updated. This property is key to building a
performant app and yet is extremely difficult to
obtain using commonly written JavaScript. In a
React application, you get it by default.
27. Batching
• Whenever you call setState on a component,
React will mark it as dirty. At the end of the event
loop, React looks at all the dirty components and
re-renders them.
• This batching means that during an event loop,
there is exactly one time when the DOM is being
updated. This property is key to building a
performant app and yet is extremely difficult to
obtain using commonly written JavaScript. In a
React application, you get it by default.
28. Sub-tree Rendering
• Whenever you call setState on a component,
React will mark it as dirty. At the end of the event
loop, React looks at all the dirty components and
re-renders them.
• This batching means that during an event loop,
there is exactly one time when the DOM is being
updated. This property is key to building a
performant app and yet is extremely difficult to
obtain using commonly written JavaScript. In a
React application, you get it by default.
29. Sub-tree Rendering
• Whenever you call setState on a component,
React will mark it as dirty. At the end of the event
loop, React looks at all the dirty components and
re-renders them.
• This batching means that during an event loop,
there is exactly one time when the DOM is being
updated. This property is key to building a
performant app and yet is extremely difficult to
obtain using commonly written JavaScript. In a
React application, you get it by default.
With shouldComponentUpdate, you have control over
whether a component should be re-rendered.
30. Sub-tree Rendering
• Whenever you call setState on a component,
React will mark it as dirty. At the end of the event
loop, React looks at all the dirty components and
re-renders them.
• This batching means that during an event loop,
there is exactly one time when the DOM is being
updated. This property is key to building a
performant app and yet is extremely difficult to
obtain using commonly written JavaScript. In a
React application, you get it by default.
shouldComponentUpdate
This function is going to be called all the time, so
you want to make sure that it takes less time to
compute the heuristic than the time it would have
taken to render the component, even if re-rendering
was not strictly needed.
37. 2 Basic Assumptions
• Two components of the same class will generate
similar trees and two components of different
classes will generate different trees.
38. 2 Basic Assumptions
• Two components of the same class will generate
similar trees and two components of different
classes will generate different trees.
• It is possible to provide a unique key for
elements that is stable across different renders.
43. List-wise Diff
Keys
renderA: <div><span key="first">first</span></div>
renderB: <div><span key="second">second</span><span
key="first">first</span></div>
=> [insertNode <span>second</span>]
Code
If you specify a key, React is now able to find insertion,
deletion, substitution and moves in O(n) using a hash table.
45. Trade-offs
• The algorithm will not try to match sub-trees of different
components classes. If you see yourself alternating
between two components classes with very similar
output, you may want to make it the same class. In
practice, we haven't found this to be an issue.
46. Trade-offs
• The algorithm will not try to match sub-trees of different
components classes. If you see yourself alternating
between two components classes with very similar
output, you may want to make it the same class. In
practice, we haven't found this to be an issue.
• If you don't provide stable keys (by using
Math.random() for example), all the sub-trees are
going to be re-rendered every single time. By giving
the users the choice to choose the key, they have the
ability to shoot themselves in the foot.
47. Where to go from here?
& Acknowledgements
• Official Documentation: https://
facebook.github.io/react/
• React’s diff algorithm: http://
calendar.perfplanet.com/2013/diff/
• React Demystified: http://blog.reverberate.org/
2014/02/react-demystified.html