React Digest #122 for November 20, 2017

  • How Redux Can Make You a Better Developer When React came out I was really amazed with its easiness of use and learning curve.
  • When I first started learning React I wasn’t aware of the fact that React is just a library and not a fully fledged framework.
  • Other frameworks would give you solutions and architecture out of the box which is not the case with React lib.
  • Getting from Redux to a state machine This article is about Stent – a Redux-liked library that creates and manages state machines.
  • In this post we’ll break down the “Redirects (Auth)” example on the React Router documentation to learn how to create authenticated routes (routes that only certain users can access based on their authentication status) using React Router.

When React came out I was really amazed with its easiness of use and learning curve. When I first started learning React I wasn’t aware of the fact that React is just a library and not a fully fledged framework. I wasn’t aware that I would need to make all decisions about architecture and what exactly I would need to use in order to solve some common tasks. Other frameworks would give you solutions and architecture out of the box which is not the case with React lib. Yes, someone might say that I was naive and dumb but that naivety and my will to learn new things pushed me forward and made me a better developer and decision maker.
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Ethereum Light client with React – Ko – Medium

Ethereum Light client with React  #react #ethereum #reactjs

  • { ssl_fc }frontend wwws mode http bind :443 ssl crt /etc/haproxy/certs/You Cert.pem timeout client 1h tcp-request inspect-delay 500ms tcp-request content accept if HTTP default_backend privatenetwork_backend acl is_privatenetwork hdr_end(host) -i Your domain use_backend privatenetwork_backend if is_privatenetworkbackend privatenetwork_backend mode http option forwardfor option http-server-close option forceclose no option httpclose balance roundrobin option…
  • web3 is official Javascript library for ethereum.npm install –save eth-lightwalletnpm install –save hooked-web3-providernpm install –save web3# Or you may do just npm installA bit of hackIn your Javascript file,// step 1: import web3, eth-lightwallet, and hooked-web3-providerimport Web3 from ‘web3’import lightwallet from ‘eth-lightwallet’import HookedWeb3Provider from ‘hooked-web3-provider’// step 2: you may need to…
  • It’s a bit troublesome though because every time I add new module, I need to do “npm install” at eth-lightwallet directory.Now you are ready to create UIFirst step is creating keystore or wallet with keystore.
  • # I pick the name wallet because in the original document, the term keystore is used both medhod name and generated wallet with keystore and bit confusing.let wallet# get pwDerivedKey password, (err, pwDerivedKey) = { if (err){ console.log(“err 1:”, err) } # goto step.2Step 2 is generate address.
  • # step.2: add new 3 connect to our node (rpc server) with hooked-web3-provider# step.3: prepare providervar web3Provider = new HookedWeb3Provider({ host: “https://your rpc server”, transaction_signer: wallet});const web3 = new Web3(web3Provider);Here you need hooked-web3-provider.

Light client is an ethereum client which keeps only keys. You can check accurate definition here. Traditionally in blockchain world, everyone keep same databases. That’s why we can trust entire…
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React Router DOM v4 Tutorial (with Examples) • techiediaries

#React Router DOM v4 Tutorial (with Examples)  #reactjs #javascript #Programming #coding

  • The < Route > component is one of the most useful components of React Router v4 and the idea behind it is simple, wherever you want to render something when only there is a match with the location’s path you can use a Route component.
  • We can just append the name to be used for the variable plus a colon : to the end of the route’s path, for example: – – When there is a path match an object which has the following properties will be created and passed to the component: – -…
  • First we import the necessary routing components such as Route and BrowserRouter – – Next we create the base layout component, besides common HTML tags we also use React Router v4 components Link and Route: – – Next we create our pages: – – And finally we create the App…
  • In our example app we used the prop exact in the Route for component HomePage – – That’s because React Router v4 uses inclusive routing instead of exclusive routing used by React Router v3 so without exact property the home component will be rendered with all other components, for example…
  • You can also navigate inside your React application using methods from the history object, for example: – – Which are equivalent to: – – Whenever you want to redirect to another location, you can place component which is when rendered will redirect to the location specified in to prop that…

In this tutorial we are going to get you started with react-router-dom using an example React application showing you how to use different concepts such as Link and NavLink for creating links (instead of anchors) in the React way, Switch and exact for enabling exclusive routing and browser routing history.
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Expo SDK 21.0.0 is now available – Exposition

  • We do recommend updating sooner rather than later — see this commit from our template projects for an example of how to update.When developing, using the new API lets us show an error screen if an error is hit during the first render of your app, instead of hanging or restarting:Note that…
  • This should make it significantly easier to tell the difference between an error loading your app and a slow network connection.If you are experiencing slow loading times when developing your app, check to see if you have the “tunnel” mode enabled in XDE/exp and try using LAN connections if your…
  • There is an example in the Native Component List, and Brent has also published a couple of example projects using the new API:We do have a documentation page for this API, although for the time being it just points to the GitHub repository.Google AdMobSDK 21 now supports displaying ads through…
  • To help your App Review process go more smoothly, we’ve decided to remove the Stripe SDK and experimental Payments API from apps built with the Expo standalone builder.
  • This was a problem with a dependency we used for detecting the machine IP address, and has been fixed.Upgrading Your AppHere’s how to upgrade your app to Expo SDK 21.0.0 from 20.0.0:Close XDE or your exp CLI serverIn app.json, change sdkVersion to “21.0.0”In package.json, change these dependencies:- react-native to expo to…

I am happy to announce the release of Expo SDK 21.0.0! It is based on React Native 0.48 “August”. Our previous SDK, 20.0.0, is based on React Native 0.47 “July”. AppLoading has been extended with new…
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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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