Higher Order Components in React – CloudBoost

Higher Order Components in React  #higherordercomponents #react #reactjs #javascript #reactjs

  • We must find a way to abstract that repetitive logic in order to avoid going through our codebase every time we want to make a change.What are Higher Order Components?As the name suggests — a Higher Order Component is some special and more important component.
  • If you’ve ever used map, reduce or filter you have already used HOF without even knowing.Similarly to that – Higher Order Components take a component as input and return another component.
  • Some of the more Object Oriented programmers will immediately scream “inheritance”, but have in mind that React favors composition.How do we make a HOC?Let’s start simple and make a HOC that we will use to log the clicks of our users.Here our function takes the component we will be wrapping as an argument and returns a brand new component with all the attached functionality to it.
  • To create our new component we will simply call the function and pass the wrapped one as a parameter.const LogsClicks = else can we do with HOCs?Higher Order Components can be used every time you’ve got repetitive logic in your components.
  • Now when the component mounts and every time it updates, our component will now look at the authenticated property and will redirect to the home page if it’s false.Something to note is that when we’re using the connect helper in order to attach our component to Redux’s store, we are creating another Higher Order Component.

Components are the building blocks of React. We separate our UI into small pieces that are responsible for rendering and managing the state of a particular part of the application. But even though…
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React And JS-WEB #react #js #javascript #es6 #es7 #jsx #webdevelopment

React And JS-WEB

#react #js #javascript #es6 #es7 #jsx #webdevelopment

  • The route function is responding to a GET request, matching the uri parameter.
  • The function passed to the route can return an object or a redirect.
  • The function passed through the route can return an object.
  • This object will be used as context in the passed html file.
  • The callback function will receive three parameters: input, session and cookie

    The input variable contains all inputs sent to the route.

The function passed to the route can return an object or a redirect. If you pass an object,
the route function will send the object as a json result.
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#react #js #javascript #es6 #es7 #jsx #webdevelopment”

All About React Router 4

  • In some ways, earlier versions of React Router resembled our traditional mental model of what an application router “should be” by placing all the routes rules in one place.
  • Here are some JavaScript concepts you need to be familiar with for this article:

    If you’re the type that prefers jumping right to a working demo, here you go:

    Earlier versions of React Router centralized the routing rules into one place, keeping them separate from layout components.

  • For the first, let’s modify our to accommodate the browsing and profile pages for users and products:

    While this does technically work, taking a closer look at the two user pages starts to reveal the problem:

    New API Concept: is given to any component rendered by .

  • Here’s a different approach which is better:

    Instead of four routes corresponding to each of the user’s and product’s pages, we have two routes for each section’s layout instead.

  • For example, both these console logs will output the same value when the browser path is `/users`:

    ES2015 Concept: is being destructured at the parameter level of the component function.

This post is going to dig into to React Router 4, how it’s so different from previous React Router versions, and why that is. My intentions for this article aren’t to rehash the already well-written documentation for React Router 4. I will cover the most common API concepts, but the real focus is on patterns and strategies that I’ve found to be successful.
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What to Expect from Maintainers #

  • Here’s what you can expect to happen when you open an issue or send a pull request.
  • In order to help maintainers focus on what is actionable, maintainers ask contributors to do a bit of work prior to opening a new issue:

    Issues that do not meet the above criteria can be closed immediately, with a link to the contributor’s guide.

  • Whatever the reason, when closing a pull request maintainers should keep the conversation friendly:

    Sometimes when a maintainer says no to a pull request or close an issue, a contributor may get upset and criticize your decision.

  • Once you have become an active contributor in the community, you may open a pull request to add yourself to the list, making sure to list your prior contributions to the community when doing so.
  • The bot can be triggered by adding any of the following commands as a standalone comment on an issue:

    Additionally, the following commands can be used on a pull request:

So you have read through the contributor’s guide and you’re getting ready to send your first pull request. Perhaps you’ve found an issue in React Native and want to work with the maintainers to land a fix. Here’s what you can expect to happen when you open an issue or send a pull request.
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Slashing the React bundle size – RoadToNaukri Stories about product and technology

Slashing the React bundle size  #product #nodejs #redux #webpack #react #reactjs

  • So whenever in production node’s server Js was hit Webpack built the React’s bundle Js.
  • Another problem was that if due to any reason our website crashed, then again webpack started building the React’s bundle file which took a lot of time as a result it was affecting the overall uptime of the website.So to solve this first of all I separated the build process of webpack from server.js and created a build.js file which generates the bundle.js separately in a “dist” folder.
  • This bundle.js from “dist” folder was used while production deployment so even if due to any reason websites crashes, there will be no more downtime due to webpack building, instead bundle.js will be taken directly from the “dist” folder.
  • To minify the bundle.js we applied the below plugins in the webpack configuration, it minified the bundle file upto 1.5MB.
  • Then use it as below:webpack plugins with BundleAnalyzerPluginNow when we run the server we are redirected to which shows below result:bundle.js is comprised of node-modules and react componentsFrom the above result its evident that more than 75% of the react bundle contains node-modules.

Converting RoadToNaukri.com to React Js powered by Redux was an exciting experience. I used Webpack for our build process. Our server side is in Node Js and as a novice at the beginning I…
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A Year of React Native: SSL Pinning – Made by Many

Notes on #ReactNative: on SSL pinning by @samueljmurray

  • When your app initiates this communication, your backend sends its certificate (which contains the public key).
  • Your app then checks that the certificate has been signed by a Certificate Authority (CA) that is trusted by the user’s device.
  • SSL pinning narrows these avenues of attack by letting you define the exact certificate or public key that your app will accept when communicating with your backend.
  • If you use a service like AWS Certificate Manager or Let’s Encrypt your certificate and public key could change at any time.
  • TrustKit also comes with a handy tool for extracting public keys from certificates and converting them to Base64 encoded SHA256 hashes.

We’ve been using React Native for over a year now and we’re loving how quickly we can create feature-rich and performant apps for iOS and Android. So far w…
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How to quickly deploy React and Node app on AWS – Abhinav Dhasmana – Medium

How to quickly deploy React and Node app on AWS  #aws #devops #nodejs #react #reactjs

  • Map port 80 to the port your node server is running: If we would type your aws machine ip address into the box, nothing would work as your app is running on port 3000 and not on port 80.
  • To enable this, we can run this commandsudo iptables -t nat -A PREROUTING -p tcp –dport 80 -j REDIRECT –to-ports 3000What this command is doing is appending (flag -A ) the iptables PREROUTING chain and saying that any tcpprotocol with a destination port (flag — dport) of 80 should be redirected to port 3000.
  • P.S: Every time a server re-start, this setting go away as they are stored in memory.
  • Look here for a tutorial.P.P.S: We could have used nginx to run on port 80 and map to our server port.

So you have a setup running on your local box with node server and a webpack server and want to deploy this code on a brand new aws ubuntu box. The expectation is when you visit your public ip…
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