Declarative D3 transitions with React 16.3

  • The new React 16.3 brings some changes to the ecosystem that change how we go about integrating React and D3 to build data visualizations.
  • Because the re-render is instant, you don’t have time to show a nice transition going into the new state.
  • We use to give D3 control of the DOM node, run a transition that lasts milliseconds, define an easing function, and change the attribute to the new value we got from props.
  • When that value changes, the transitions itself to its new position.
  • If we flip positions during a transition, D3 is smart enough to stop the previous transition and start a new one.

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Introduction To Redux

  • Before you start reading this article, I will suggest you read the first part of this Redux series to have a basic understanding of Redux features and functionalities, – – The events happening in the application are called actions.
  • There are 3 core benefits to having immutable state – – To change the store, you dispatch an action that is ultimately handled by a reducer.
  • A reducer is a function that takes state and an action and returns a new state.
  • When the store is created, Redux calls the reducers and uses their return values as an initial state.
  • In this article, we saw what actions, store, and reducers are in Redux.

In this article, we will see what Actions, Store and Reducers are,.
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redux-dsm is an easier way to handle async state. v3.0.0 has simplified state graphs. Yay! #reactjs #redux

  • Since I switched to Redux, I handle all of my view state transitions by dispatching action objects, and that requires writing a bunch of boilerplate, such as action types (e.g., ), and action creators (which your view or service layers can call to create actions without forcing you to import…
  • is an object with camelCased keys and strings corresponding to your state transitions.
  • For the above example, it returns: – – will be an object with camelCased keys and function values corresponding to your state transitions.
  • For each transition, an action creator is created which will automatically fill in the correct action type, and pass through to the state.
  • The example fetch state machine will produce the following : – – is a normal Redux reducer function that takes the current state and an action object, and returns the new state.

redux-dsm – Declarative state machines for Redux: Reduce your async-state boilerplate.
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How to Connect your React App to a REST API – codeburst

  • Today we are going to connect this app to an existing REST API and use the fetched data to display our previously created list of contacts.Over the whole series of articles, we’re going to build a functional contact list with React:Part 1 — How to Create a React App with create-react-appPart 2 — How…
  • This way, the app fetches contacts at the startup and fills our contact list with data.PreparationsIf you don’t have the source code of the previous part ready, you can clone it from GitHub, install the dependencies and start the appgit clone contacts-managergit checkout part-2npm installnpm startThe app is now available…
  • To begin, let’s install axios: In your root directory (where your package.json is) execute the following command line:npm i -S axiosNext, open your App.js and perform the following actions:add the componentDidMount lifecycle method to the App component.import axios from the just installed packageadd the axios GET request to componentDidMount to…
  • Since it is empty, it is the initial State object with a replaced “contacts” property.Finally — Set the new StateNow that we got our data, picked the relevant parts out of it and created a “new” State object, we store it in the State of the App call, puts the “newState” object as…
  • Also, you learned that if you want to fetch data from a server at the startup of the app, you’ll do it in componentDidMount in a suitable component.You also learned, how to set State and that you can pass an object or a function to setState.Last but not least, you’ve…

In the previous parts of this series you learned how to bootstrap a new React app with create-react-app and create a list component. Today we are going to connect this app to an existing REST API and…
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How I built a Content Management System for a React app in one day

How to Build a #ContentManagement System in just 1 day!


#JavaScript #React #Reactjs #CMS

  • DYI content management system with Firebase  ReactHow I built a Content Management System for a React app in one dayFirebase + React = Quick DIY CMSThere are two ways of handling website content:Use a CMS.Hard code in the copy/image urls in the code itself.Option number 2 quick at first, and is fine…
  • However, two big problems will surface and grow as companies scale.In fact, I have personally experienced multiple times the first of these two problems at work.Problem 1: time wasted by engineerEvery time there needs to be a content change, the product team would need to ping an engineer, and the engineer…
  • This will definitely be a problem if the company ever goes international in non-English speaking countries.SolutionThe solution to these two problems is a good content management system.Pillow, where I’m currently working, had a Hackathon last week.
  • Anyone can signup for an account with their gmail, create a project, and add data to the database.Because of the NoSQL structure, I thought it would be a great way to store website copy.
  • This is what I did to structure Pillow’s landing page copy during the Hackathon:Screenshot of json data structurePillow’s website is already built with React, and that made my job a lot easier.All I needed to do on that front is install re-base, set up some configuration, and replace the hard…

Option number 2 quick at first, and is fine for an early stage startup operating in one country. However, two big problems will surface and grow as companies scale. Every time there needs to be a…
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Beginner’s guide to react/redux —painting a mental model

  • I highly recommend anyone starting out with Redux to read the core concepts outlined in the official documentation.Long story short, Redux application has a plain object, known as store, which serves as data model for your app.
  • For example, for a list of articles, I can have an article state that looks like this:state = { articles: [{ “id”: 314, “title”: “6 innovative apps utilizing the ethereum network”, “source”: “Investopedia‎”, “link”: “date”: “1500523200”, “type”: “msm” }, { “id”: 893, “title”: “what is plasma and how will it strengthen…”, “source”: “Investopedia‎”, “link”: “date”: “1502856000”, “type”: “msm” },.
  • In our article example, fetching articles is an action that looks that this:{ type: ‘ARTICLES_FETCHED’, payload: [{ “id”: 314, “title”: “6 innovative apps utilizing the ethereum network”, “source”: “Investopedia‎”, “link”: “date”: “1500523200”, “type”: “msm” }, { “id”: 893, “title”: “what is plasma and how will it strengthen…”, “source”: “Investopedia‎”, “link”: “date”: “1502856000”, “type”: “msm” },.
  • In our article example, the reducer looks like this:const initialState = { articlesById: null,}export default function(state = initialState, action) { switch (action.type) { case types.ARTICLES_FETCHED: return { …state, articlesById: action.articlesById } default: return initialState }}To summarize the basic ideas of Redux:it describes state as plain objects, and store (global state) by merging all the states in your app.it describes changes to the app as plain objects.it uses pure functions to handle changes.The redux API then bridges your redux logics with react views while providing some utilities to compose states.Say we send a request to a remote server and fetch some articles.
  • The reducer evaluates the action and store the payload articles in the state.

Disclaimer: This article is written by a beginner trying to comb through new concepts she just learned. React/Redux is the hottest frontend frameworks these day. If you google the term Redux diagram…
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Redux with React – First Look #reactjs #Redux #javascript #appdev #programming #devops

Redux with React - First Look  #reactjs #Redux #javascript #appdev #programming #devops

  • Let’s start with the basics:

    According to the official site Redux is defined as a predictable state container for JavaScript apps.

  • In Redux, reducers are functions (pure, I will explain what a pure function is later) that take the current state of the application and an action and then return a new state.
  • 3 – Store

    Store is the object that holds the application state and provides a few helper methods to access the state, dispatch actions and register listeners.

  • – Changes are made with pure functions: To specify how the state tree is transformed by actions, you write pure reducers.
  • You might be interested in:

    Predictability of outcome:

    There is always one source of truth, the store, with no confusion about how to sync the current state with actions and other parts of the application.

influenced by Flux architecture and became popular very quickly, excellent documentation and size (2 KB). Also it is very easy to use redux with react
Continue reading “Redux with React – First Look #reactjs #Redux #javascript #appdev #programming #devops”

Redux with React

Redux with React - First Look  #reactjs #Redux #javascript #appdev #programming #devops

  • Let’s start with the basics:

    According to the official site Redux is defined as a predictable state container for JavaScript apps.

  • In Redux, reducers are functions (pure, I will explain what a pure function is later) that take the current state of the application and an action and then return a new state.
  • 3 – Store

    Store is the object that holds the application state and provides a few helper methods to access the state, dispatch actions and register listeners.

  • – Changes are made with pure functions: To specify how the state tree is transformed by actions, you write pure reducers.
  • You might be interested in:

    Predictability of outcome:

    There is always one source of truth, the store, with no confusion about how to sync the current state with actions and other parts of the application.

influenced by Flux architecture and became popular very quickly, excellent documentation and size (2 KB). Also it is very easy to use redux with react
Continue reading “Redux with React”

Action Streams and Redux – Markus Coetzee – Medium

Action Streams and Redux @MarkusCtz  #Redux #Reactjs #JavaScript

  • With the code the question of ‘How does this list of items behave’ becomes easy to answer, because it has been explicitly declared and we no longer have to search the code to build up our mental model.
  • The code seems fine, but we did introduce state management to the function, which has resulted in some control flow.
  • With the code each operation is also responsible for reloading the list – i.e., we’re mixing concerns, which I don’t think is inherently wrong, but in this case it can easily result in spaghetti code if the screen’s complexity increases.
  • If we need to imperatively integrate with the data flow of an older module, you would likely need to manually subscribe to it and dispatch a new Redux action when it triggers.
  • When we have successfully performed an operation on a list item, we want to reload the list.

A couple of months ago I experimented with using RxJS for unidirectional data flow. The focus was on showcasing how action streams could be used to form state streams via plain old reducer functions…
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