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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How To Open Source Parts Of Your Private Project With Bit

  • Using Bit, you can isolate these sets of files (we call code components) from your project and share them with the open source community, while keeping their source project private and intact.
  • js – │ └── index.js – └── utils – └── noop.jsBefore Bit, we would have to create a new GitHub project for this component, remove hello-world from your private project and make all its dependancies (packages as well as other files from the project) available for the new project.
  • With Bit, you can keep this component as part of your private project and still make it available to the community to discover, use and collaborate on.
  • Open source parts of your project to the communityTo make sure your components are truly executable outside of the project’s context, Bit will build an isolated component environment and apply all configured extensions to test, compile or perform any other defined task.
  • You can also use bit import to bring the component’s source code into other projects, develop them and merge changes between different projects.

How to make parts of your private projects open source and make their components available to the community without having to split your repositories or create new projects on GitHub. Learn more.
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Styling in React – codeburst

  • A style rule will have been inlined ğŸ‘� – Before digging into third party CSS in JS, let’s roll back to creating it ourself to understand the core benefits.
  • ğŸ‘� – A major benefit of defining CSS in JS is to be able to conditionally generate styles.
  • You’re also inlining everything 😭 – Third party packages exampleLuckily, there are some great third party packages to aid with handling CSS in JS 😌 – I don’t have experience with them all so I will be using styled-components for these examples.
  • If you’d rather take a quick look at styled-components before going any further, check it out here ğŸ‘� Don’t worry though, I will keep any examples intuitive and simple.
  • But consider that our CSS will have to contain styling for when the nav is open and closed ğŸ‘� – Using styled-components we could create something more along the lines of – That is so much clearer ğŸ˜� Any styling declaration via classNames are extracted and we are left with…

Styling is a huge part of the user experience for your apps. You’ve got a new design and you’re going to build your new awesome app in React. But how do you go about implementing that design? It…
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#reactjs Scope – Visualize components as you interact with an application

#reactjs Scope - Visualize components as you interact with an application

  • Our DevTool allows you to picture your components, state and props as a DOM tree visualization.
  • As you trigger state changes within your app (e.g., a click event), the visualization will update as well.
  • The ability to visualize state changes and identify where props are being passed down can make debugging React applications easier.

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Choosing Between React and Vue For WordPress Development

Choosing Between #ReactJS and #VueJS For WordPress Development -

  • In React, component state is mutated using the function setState(), while in Vue, you just change the variable value directly or you use v-model directive in an HTML template and it’s all magical.
  • Any mildly complex Vue or React app needs state management — using Redux, V\uex or similar — for app state and that involves state update function.
  • When creating React or Vue components this way, you have to write your own change handlers to modify state.
  • Vue’s data model is inspired by React and other frameworks based on observables.
  • In the React world create-react-app is a CLI tool, like Vue CLI for scaffolding apps.

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How to build a GitHub bot with PhantomJS, React, and Serverless framework

  • How to build a GitHub bot with PhantomJS, React, and Serverless frameworkThis tutorial is about building a simple Serverless bot that returns a chart with top GitHub repository contributors for a selected period.
  • To retrieve top repository contributors, we will use GitHub stats API, the amazing Nivo to display data, Storybook to check how our chart looks and feels, PhantomJS to turn HTML into an image, and Serverless framework to interact with AWS.
  • The only difference is an additional permission to invoke lambda: – iamRoleStatements: [ Effect: ‘Allow’, – Action: [‘lambda:InvokeFunction’], – Resource: [‘*’] – }]Setting up the Slack botThe last step will be to create a service that will handle message events for the bot.
  • npm install -g serverless – npm install -g servicelessCopy the GitHub and Slack bot tokens, and set them to GITHUB_TOKEN and SLACK_TOKEN environment variables accordingly.
  • At the end you should see a similar output: – Deployment completed successfuly[app/html-to-png] [completed]: – Service Information – service: html-to-png – stage: dev – region: us-east-1 – stack: html-to-png-dev – api keys: – None – endpoints: – None – functions: – renderToPng: Removing old service versions… – [app/slack] [completed]: -…

This tutorial is about building a simple Serverless bot that returns a chart with top GitHub repository contributors for a selected period. It is relevant to those who have some experience with…
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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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Optional Chaining Operator in JavaScript – Bene Studio

  • var user = { name: ‘Joe’ } – var zip = user.address.zip // ⚡⚡⚡Uncaught TypeError: Cannot read property ‘zip’ of undefinedIn this example we expect user.address.zip to exist but for some reason the address is missing from the user object.
  • Workaround #1: Logic Expressionsvar user = { name: ‘Joe’ } – var zip = user – user.address – user.address.zipNoisy and verbose.
  • Workaround #2: Ternary Operatorsvar user = { name: ‘Joe’ } – var zip = – user === undefined – ?
  • Workaround #3: Try-Catchvar user = { name: ‘Joe’ } – var ziptry { – zip = user.address.zip – } catch (error) { – zip = null – }Breaks control and has own scopes.
  • bin/babel index.jsThe Transpiled CodeTranspiled version of the index.js above: – var _user$address;var user = { – name: ‘Joe’ – };var zip = – user == null – ?

All of us usually confronts the situation where an expected member of a property chain is undefined or null. In this example we expect user.address.zip to exist but for some reason the address is…
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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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nohoist in Workspaces

  • First, let’s take a quick tour on how hoist work in standalone projects: – – To reduce redundancy, most package managers employ some kind of hoisting scheme to extract and flatten all dependent modules, as much as possible, into a centralized location.
  • In such project, modules could be scattered in multiple locations: – – yarn workspaces can share modules across child projects/packages by hoisting them up to their parent project’s node_modules: .
  • Consequently, workspaces developers often witness “module not found” related errors when building from the child project: – – For this monorepo project to reliably find any module from anywhere, it needs to traverse each nodemodules tree: *“monorepo/nodemodules”* and .
  • There are indeed many ways library owners can address these issues, such as multi-root, custom module map, clever traversing scheme, among others… However, – – It is frustrating when a solution worked for a standalone project only fell short in the monorepo environment.
  • Module path is a virtual path of the dependency tree, not an actual file path, so no need to specify “node_modules” or “packages” in the nohoist pattern.

As wonderful as yarn workspaces are, the rest of the community hasn’t yet fully caught up with the monorepo hoisting scheme. The introducing of the nohoist i…
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