Building an eCommerce Scraper with Node.js and React.js

  • It allows the user to type in a specific product name, to crawl multiple e-commerce sites and asynchronously return useful results to the user.
  • UI and ArchitectureBuilding the front endTo make it short, the front end is really small (only two pages: one for the search box and another one for the results).
  • I moved everything from ‘search term’ to ‘search results items’ into Redux’s state, thus making the code structure cleaner and nicer.
  • Some other problematic factors include: – Not having pre-stored information that could be useful to make predictions.Each result item consisting only of the following data: title, price, URL and thumbnail.My conclusion was to use a weighted ranking algorithm.
  • In a more complete implementation, that data could be useful for some sort of Machine Learning algorithm to predict the most useful way to rank results.

This is a quick story about how I created a simple but end-to-end e-commerce scraping web application called “crawl-io”. The goal behind this article is to provide an example of an implementation so…
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React Native Performance Optimization and Profiling

#reactnative Performance Optimization and Profiling

  • State of React Native performanceReact per default re-renders a component every time its parent receives new props or updates its state, that’s one of many reasons why the React paradigm for building UI’s is superior.
  • Luckily many of the standard React Native components executes on a separate thread known as the main thread.
  • If you are offloading work from JavaScript to the native side prevent the bridge from becoming overloaded by monitoring how many times data are sent and received over the wire.
  • class Component extends React.Component { – renderSectionHeader = () = View style={…} /render() { – return ( – FlatList – {…this.props} – / – ) – } – }If you still consider to handle navigation on the JavaScript side or you are struggling with frame drops during animations.
  • class AfterInteractions extends React.Component {state = { interactions: true } – – componentDidMount() { – = { – this.setState({ interactions: false }) – }render() { – if (interactions) { – return null – } – return this.props.children – } – }Animations in React Native looks good and are easy to…

React Native is a popular technology for engineers who are looking for building mobile applications in a productive way without compromising on native performance. Devices today comes with multi core…
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9 React Tools To Master Your Component Workflow – Bits and Pieces

  • Basically, this project lets you define styled-components that posses their own encapsulated styles so that styling becomes an actual part of your components while avoiding the use of CSS classes as a mediator layer.
  • This project is growing in popularity to become the go-to choice for styling React components, and is defiantly worth checking out for your next app.
  • This project “scans” your app for React components and lets you render components with different states and props while mocking external dependencies, so you can see your app’s state in real-time.
  • React Sketch.appFor the UI designer / dev among you, React-sketchapp is Airbnb’s open source project built for design system which enables the rendering of React components using Sketch.
  • From sharing components between apps with Bit to styling with styled-components or using storybook to render and play with components in isolation, and all the way to less familiar projects like UiZoo and others, the React ecosystem is growing rapidly to help you build an amazing UI.

Best 9 React component tools and libraries that can make all the difference for mastering your work with React components for developing a beautiful UI for your React application. Check out the list.
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@acemarke/redux-starter-kit

  • A simple set of tools to make using Redux easier – – The package is intended to help address three common complaints about Redux: – – We can’t solve every use case, but in the spirit of and , we can try to provide some tools that abstract over the…
  • Takes a single configuration object parameter, with the following options: – – A utility function to create reducers that handle specific action types, similar to the example function in the “Reducing Boilerplate” Redux docs page.
  • Takes an initial state value and an object that maps action types to case reducer functions.
  • Internally, it uses the library, so you can write code in your case reducers that mutates the existing value, and it will correctly generate immutably-updated state values instead.
  • It also accepts an object of customization options for more specific use cases.

A simple set of tools to make using Redux easier
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How does CSS fit into Reactjs? – Hacker Noon

How does CSS fit into React? #css #reactjs

  • In React, using JSX, this looks like this: – p style={{color: “red”}}Hello World/p – Inline styles are probably the most limited approach in terms of styling full blown applications since they cannot make use of all of the CSS features such as pseudo selectors, animations and media queries.
  • CSS ModulesWith CSS modules you create a CSS file for every type of component that you want to style the same way that you might do with the “Standard CSS” option, however the difference here is that with CSS modules the styles are scoped locally which means that unlike “Standard…
  • How to use within React: – Use css-loader inside of your webpack.config with modules property set to true, or download a complete library such as css-modules, once setup use as follows: – create a CSS file for whatever components you want to stylewrite your CSSimport this CSS file inside of…
  • Behind the scenes CSS-in-JS is usually implemented in one of the following three ways (or a combination of): – via inline stylesvia a style elementvia a link element at build time by extracting styles into a CSS fileFor the sake of not making the article overly long, we will only…
  • If you like what you see, you might also want to checkout another, very similar, CSS-in-JS library called Emotion, it is very similar to styled-components but gives you the option of extracting all of your styles into a CSS file, at build time, which then get linked into the document…

There are a lot of different ways in which you can style your React applications, and I would even go as far as to say that you actually have more options for styling React applications than…
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Introducing Rekit Studio: a real IDE for React and Redux development

#reactjs , with #Redux to #code there is now this:

  • As an IDE, besides code editing, Rekit Studio provides the capability for code generation, dependency diagraming, refactoring, building, unit tests, and a meaningful way to navigate code.You will no longer care about how to setup the project, config webpack, or organize your folder structure.
  • That’s what makes Rekit Studio different from other code editors like Sublime Text and VS Code.See the quick demoBefore the introduction, you may want to see a quick demo video about how to use Rekit Studio to manage Redux actions.From the video, we can see that all we care about is…
  • Then the project explorer can show the project structure in a meaningful way, like this:Project ExplorerRekit Studio knows the features of those project elements, like which actions are asynchronous (with blue mark “A”), which components connect to the Redux store (with green mark “C”), and which components are managed by…
  • This caused our project to become hard to maintain in a short time.Now with Rekit Studio, you can right click a component or action to move, and rename or delete it just like you do with other IDEs like Eclipse for Java or Visual Studio for .Net.
  • If you want to create some new elements like selectors, or you want to alter the default code boilerplate (like using `redux-saga` instead of `redux-thunk` for async actions), you can create plugins to do it.See more about the plugin system here.Command line interfaceBesides Rekit Studio, there is another command line…

We’re very excited to announce the stable release of Rekit Studio, a complete IDE for React, Redux and React Router development! Though it’s maybe new to some of you, it has helped us build…
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Introducing Rekit Studio: a real IDE for React and Redux development

Introducing Rekit Studio: a real IDE for React and Redux development

#reactjs #javascript

  • As an IDE, besides code editing, Rekit Studio provides the capability of code generation, dependency diagram, refactoring, build, unit tests and a meaningful way of code navigation.
  • That’s what makes Rekit Studio different from other code editors like Sublime Text, VS Code.See the quick demoBefore the introduction you may want to see a quick demo video about how to use Rekit Studio to manage Redux actions.From the video we can see with Rekit Studio, all you care about…
  • I introduced the practices in two previous articles:Based on the pattern, Rekit Studio knows which files are components, which are actions, where routing rules are defines and so on.
  • Then the project explorer could show the project structure in a meaningful way like below.Project ExplorerRekit Studio knows feature of those project elements, like which actions are asynchronous (with blue mark ‘A’); which components connect to Redux store (with green mark ‘C’); which components are managed by React Router (with…
  • This will cause our project becomes hard to maintain in a short time.Now with Rekit Studio, you can right click a component or action to move, rename or delete it just like you do with other IDEs like Eclipse for Java, Visual Studio for .Net.

We’re very excited to announce the stable release of Rekit Studio, a complete IDE for React, Redux and React Router development! Though it’s maybe new to some of you, it has helped us build…
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New context API by acdlite · Pull Request #11818 · facebook/react · GitHub

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react – A declarative, efficient, and flexible JavaScript library for building user interfaces.
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Create actions with redux-tide it’s simple! #redux #reactjs #Redux #React

Create actions with redux-tide it's simple!

#redux #reactjs #Redux #React

  • You don’t need to create reducers for rest-api data – – You should create reducers only for business front-end logic – – Redux-Tide – Do not force you to use only it, – – This is a small library helping you create normalization, actions, reducers and selector – – You…
  • js example from Usage section – – When you need to force a clear state of action, please use – – Please read Create one action for different entity id section and Other options to create an action – – And look examples: – – different-entity-id-example – – different-entity-id-source -…
  • () action id if you called where postId === 5 .
  • { post with id 5 is was deleted success } } we used action delPostById with prefix postId so, actionId has postId in actionId and if you want track all calls with any postId you hould used parentActionId property parentActionId – it’s actionId from action which was called .
  • () } } } – – For details you can look example: – – different-entity-id-example – – methods returns same action – – But generate new uniq dispatch type and new uniq action state – – You should be call , , when you are dispatch event and use getActionData…

redux-tide – Simple library for redux crud normalized state and actions/selectors for it
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#redux #reactjs #Redux #React”

Mobdux: Combining the good parts of MobX and Redux – Cameron Fletcher – Medium

Mobdux: combining the good parts of MobX and Redux  #ReactJS #Redux #Mob

  • In MobX it is easy to structure your stores in a tree-like manner so that at any point you can view the entire state of your application.
  • Additionally, by using MobX in strict mode, you are forced to make any mutations to your state in actions.
  • The combination of a single store, strict mode, and the excellent mobx-react-devtools help give back some of the predictability and traceability of Redux.One of the ways the libraries significantly diverge however, is when connecting your state to your components.
  • Redux on the other hand, recommends the smart component / dumb component pairing so that each component (regardless of where it sits in the hierarchy) can look up everything it needs to render itself.I prefer the Redux approach for a number of reasons:Easier to move things around in your component…
  • Also, we can remove all knowledge of MobX from our dumb components by encapsulating all of this logic in our smart component wrapper, removing the need for the observer decorator entirely.

MobX and Redux give you two opposing ways to manage your state effectively in a React application. As an experiment I attempted to merge the good parts of both approaches, and ended up with a new…
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