Tech talk about scalable architectures with React and Redux.
We take a walk on problems that React proposes to solve and in which situations the Redux is indicated.
We dive deep into patterns of organization and structuring of projects React and Redux focusing on scalability and maintainability.
Explanation of the fundamentals of Redux with additional tips and good practices. Presented in the Munich React Native Meetup, so the sample code is using React Native. Additional code: https://github.com/nacmartin/ReduxIntro
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.
Learn how to develop front-end JavaScript web applications using React and Redux for the application architecture. Immutability and one-way data binding at it's finest. Focus on components and state management without all the hassle.
Code examples available here: https://github.com/kinabalu/mysticpaste_react_example
Tech talk about scalable architectures with React and Redux.
We take a walk on problems that React proposes to solve and in which situations the Redux is indicated.
We dive deep into patterns of organization and structuring of projects React and Redux focusing on scalability and maintainability.
Explanation of the fundamentals of Redux with additional tips and good practices. Presented in the Munich React Native Meetup, so the sample code is using React Native. Additional code: https://github.com/nacmartin/ReduxIntro
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.
Learn how to develop front-end JavaScript web applications using React and Redux for the application architecture. Immutability and one-way data binding at it's finest. Focus on components and state management without all the hassle.
Code examples available here: https://github.com/kinabalu/mysticpaste_react_example
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
Getting started with the reactjs, basics of reactjs, introduction of reactjs, core concepts of reactjs and comparison with the other libraries/frameworks
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.
NgRx is a framework for building reactive applications in Angular. NgRx provides state management, isolation of side effects, entity collection management, router bindings, code generation, and developer tools that enhance developers experience when building many different types of applications
This slide covers redux design pattern, ngrx store and effects and how they communicate and debugging with ngrx store dev-tools.
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
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
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.
- What is redux ?
- Redux Principles
- Data Flow in Redux
- Understanding Action, Reducers, Store
- Data flow in React-Redux App
- Demo
Redux Utilities
How to use redux with react hooks in react native applicationKaty Slemon
Redux hooks are available since the release of React version 16.8.x, and in this blog post, we will explore a structured pattern for Redux making use of React Native.
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
Getting started with the reactjs, basics of reactjs, introduction of reactjs, core concepts of reactjs and comparison with the other libraries/frameworks
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.
NgRx is a framework for building reactive applications in Angular. NgRx provides state management, isolation of side effects, entity collection management, router bindings, code generation, and developer tools that enhance developers experience when building many different types of applications
This slide covers redux design pattern, ngrx store and effects and how they communicate and debugging with ngrx store dev-tools.
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
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
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.
- What is redux ?
- Redux Principles
- Data Flow in Redux
- Understanding Action, Reducers, Store
- Data flow in React-Redux App
- Demo
Redux Utilities
How to use redux with react hooks in react native applicationKaty Slemon
Redux hooks are available since the release of React version 16.8.x, and in this blog post, we will explore a structured pattern for Redux making use of React Native.
Maintaining sanity in a large redux appNitish Kumar
The most common complaint about using Redux with React is how it makes you write a lot of boilerplate. We’ll see how Redux lets us choose how verbose we'd like our code to be, depending on personal style, team preferences, longer term maintainability, etc.
Slides for the 2016 Redux & Angular workshop. Redux is a popular library for state management. This workshop is about understanding how to use Redux and how to integrate it wit Angular 2
Redux - idealne dopełnienie Reacta. Prezentacja przedstawiona na warsztatach z podstaw technologii Redux w ramach DreamLab Academy.
W razie pytań zapraszamy do kontaktu academy@dreamlab.pl
The presentation has been part of DreamLab Academy workshop on Redux. For more details get in touch - academy@dreamlab.pl
Manage the Flux of your Web Application: Let's ReduxCommit University
Flux, un pattern alternativo a MVC sviluppato dagli ingegneri di Facebook; Redux, nuovo pattern ideato da Dan Abramov che da molti è considerato un’evoluzione di Flux.
Pattern architetturali, i loro pregi, i loro difetti, insieme a Francesco Strazzullo.
В презентации описаны лучшие практики использования библиотеки React в связке с Redux. Быстрое разворачивание SPA без настройки Webpack и Babel с помощью утилиты Create React App, Smart and Dumb, Stateful and Stateless Components, управление рендером с помощью shouldComponentUpdate, Redux модули, мемоизация и middlewares.
More useful info on our:
- website: https://clickky.biz
- blog: https://clickky.biz/blog
Sign up!
Ti sei perso nel caos di “props” ed “emit” della tua web app Vue.js? Usa Vuex!
Vuex è lo state manager di Vue.js per eccellenza, una singola fonte di verità che ottimizza la condivisione di informazioni tra componenti.
Vediamo come introdurre facilmente Vuex in progetti esistenti, con un occhio per il testing
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
2. REDUX - ACTION
- Actions are payloads of information that send
data from your application to your store.
- They are the only source of information for the
store.
- You send them to the store using store.dispatch().
3. REDUX - ACTION
NOTE: PAY CLOSE ATTENTION TO
store.dispatch()
IT IS USED WHEN SENDING ACTION TO STORES.
4. REDUX - ACTION
const ADD_TODO = 'ADD_TODO'
{
type: ADD_TODO,
text: 'Build my first Redux app'
}
NOTE: type is a must, you can add other things provided you meet
the type requirements.
5. REDUX - ACTION
- Actions are plain JavaScript objects.
- Actions must have a type property that indicates the type
of action being performed.
- Types should typically be defined as string constants.
- Once your app is large enough, you may want to move them
into a separate module.
7. REDUX - ACTION - ACTION CREATORS
Action creators are exactly that—functions that
create actions.
It's easy to conflate the terms “action” and “action
creator,” so do your best to use the proper term.
10. REDUX - REDUCERS
- Reducers specify how the application's state
changes in response to actions sent to the store.
- Remember that actions only describe the fact that
something happened, but don't describe how the
application's state changes.
11. REDUX - REDUCERS
The reducer is a pure function that takes the previous state and
an action, and returns the next state.
(previousState, action) => newState
12. REDUX - REDUCERS
PURE FUNCTION
function priceAfterTax(productPrice) {
return (productPrice * 0.20) + productPrice;
}
13. REDUX - REDUCERS
IMPURE
var tax = 20;
function calculateTax(productPrice) {
return (productPrice * (tax/100)) + productPrice;
}
14. REDUX - REDUCERS
Things you should never do inside a reducer:
- Mutate its arguments;
- Perform side effects like API calls and routing transitions;
- Call non-pure functions, e.g. Date.now() or Math.random().
15. REDUX - REDUCERS
Given the same arguments, it should calculate the
next state and return it.
- No surprises.
- No side effects.
- No API calls.
- No mutations.
- Just a calculation.
16. LETS WALK DOWN SOME DEEP
actions.js
export const VisibilityFilters = {
SHOW_ALL: 'SHOW_ALL',
SHOW_COMPLETED: 'SHOW_COMPLETED',
SHOW_ACTIVE: 'SHOW_ACTIVE'
}
17. We'll start by specifying the initial state.
Redux will call our reducer with an undefined state
for the first time.
This is our chance to return the initial state of our
app.
ALWAYS HAVE AN INITIAL STATE IN MIND
22. Cloning
var obj = { a: 1 };
var copy = Object.assign({}, obj);
console.log(copy); // { a: 1 }
23. function todoApp(state = initialState, action) {
switch (action.type) {
case SET_VISIBILITY_FILTER:
return Object.assign({}, state, {
visibilityFilter: action.filter
})
default:
return state
}
24. NOTE:
1. We don't mutate the state.
- We create a copy with Object.assign().
- Object.assign(state, { visibilityFilter: action.filter }) is also wrong: it will
mutate the first argument.
- You must supply an empty object as the first parameter.
- You can also enable the object spread operator proposal to write { ...state,
...newState } instead.
2. We return the previous state in the default case. It's important to return
the previous state for any unknown action.
25. LETS SEE THE ACTION?
export function setVisibilityFilter(filter) {
return { type: SET_VISIBILITY_FILTER, filter }
}
27. GOING DEEPER - ACTION
export function addTodo(text) {
return { type: ADD_TODO, text }
}
28. PROBLEMS AT SCALE
When the app is larger, we can split the reducers into
separate files and keep them completely independent and
managing different data domains.
29. SOLUTION:
- Redux provides a utility called combineReducers()
- All combineReducers() does is generate a function
that calls your reducers with the slices of state
selected according to their keys, and combining their
results into a single object again.
30. REDUX - STORE
we defined the actions that represent the facts
about “what happened” and the reducers that
update the state according to those actions.
The Store is the object that brings them together.
31. REDUX - STORE
The store has the following responsibilities:
- Holds application state;
- Allows access to state via getState();
- Allows state to be updated via dispatch(action);
- Registers listeners via subscribe(listener);
- Handles unregistering of listeners via the function returned by
subscribe(listener).
32. REDUX - STORE
It's important to note that you'll only have a single
store in a Redux application.
33. REDUX - STORE
- It's easy to create a store if you have a reducer.
- We used combineReducers() to combine several
reducers into one.
- We will now import it, and pass it to
createStore().
34. REDUX - STORE
import { createStore } from 'redux'
import todoApp from './reducers'
let store = createStore(todoApp)
35. REDUX - STORE
You may optionally specify the initial state as the second
argument to createStore(). This is useful for hydrating the state of
the client to match the state of a Redux application running on the
server.
let store = createStore(todoApp,
window.STATE_FROM_SERVER)
37. DATA FLOW
Redux architecture revolves around a strict unidirectional
data flow.
This means that all data in an application follows the same
lifecycle pattern, making the logic of your app more
predictable and easier to understand. It also encourages
data normalization, so that you don't end up with multiple,
independent copies of the same data that are unaware of
one another.
38. DATA FLOW - 4 STEPS OF REDUX
1. You call store.dispatch(action).
An action is a plain object describing what happened. For example:
{ type: 'LIKE_ARTICLE', articleId: 42 }
{ type: 'FETCH_USER_SUCCESS', response: { id: 3, name: 'Mary' } }
{ type: 'ADD_TODO', text: 'Read the Redux docs.' }
Think of an action as a very brief snippet of news. “Mary liked article 42.” or “‘Read the Redux docs.' was
added to the list of todos.”
You can call store.dispatch(action) from anywhere in your app, including components and XHR callbacks,
or even at scheduled intervals.
39. DATA FLOW - 4 STEPS OF REDUX
2. The Redux store calls the reducer function you gave it.
The store will pass two arguments to the reducer: the current state
tree and the action. For example, in the todo app, the root reducer
might receive something like this:
40. let previousState = {
visibleTodoFilter: 'SHOW_ALL',
todos: [
{
text: 'Read the docs.',
complete: false
}
]
}
41. // The action being performed (adding a todo)
let action = {
type: 'ADD_TODO',
text: 'Understand the flow.'
}
42. // Your reducer returns the next application state
let nextState = todoApp(previousState, action)
43. DATA FLOW - 4 STEPS OF REDUX
3. The root reducer may combine the output of multiple reducers into a
single state tree.
REMEMBER
How you structure the root reducer is completely up to you. Redux ships with
a combineReducers() helper function, useful for “splitting” the root reducer
into separate functions that each manage one branch of the state tree.
45. When you emit an action, todoApp returned by combineReducers will call both reducers:
let nextTodos = todos(state.todos, action)
let nextVisibleTodoFilter = visibleTodoFilter(state.visibleTodoFilter, action)
It will then combine both sets of results into a single state tree:
return {
todos: nextTodos,
visibleTodoFilter: nextVisibleTodoFilter
}
While combineReducers() is a handy helper utility, you don't have to use it; feel free to write your
own root reducer!
46. DATA FLOW - 4 STEPS OF REDUX
4. The Redux store saves the complete state tree returned by the root
reducer.
This new tree is now the next state of your app! Every listener
registered with store.subscribe(listener) will now be invoked; listeners
may call store.getState() to get the current state.
Now, the UI can be updated to reflect the new state. If you use bindings
like React Redux, this is the point at which
component.setState(newState) is called.