Container Components and Stateless Functional Components in React – Zsolt Nagy

  • Let’s introduce functional components:

    has become a function with a argument, returning the return value of the method of the original implementation.

  • Implications of the structure of stateless functional components:

    In the introduction, I mentioned that stateless functional components come with performance benefits.

  • Typically, container components have the following properties:

    The rule of thumb for choosing the appropriate syntax for React components is the following:

    then it is advised to use stateless functional components.

  • Let’s put theory into practice, and transform all the stateless component in our chat application into functional components.
  • Reviewing the conditions for modeling a component with a function, we can see that there is absolutely nothing preventing us from creating a functional equivalent of the class.

We will now introduce another way to define simple components. You will not only write less code, but you will also benefit from performance optimizations done by React. Let’s introduce functional components:
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  • Through our elite curriculum, small class sizes and expert faculty, V School’s Full-Stack Web Development program is the most certain bridge from little to no coding background into a well paying career as a web developer.
  • V School has been recently ranked Top Coding Bootcamp 2017 for both our In-Person & Online modalities (switchup.org).
  • Take our courses online from anywhere with V School Interactive!
  • At V School our student body are from all over the globe, so whether you travel frequently, don’t happen to live close to one of our campuses, or just prefer online education, V School’s award winning Online / Interactive modality is literally changing the way people learn to code.
  • For a fraction of the time / recourses that you might invest in traditional ed, V School equips you with a tool kit of essential skills & languages that ready you for a career in technology now.


Through our elite curriculum, small class sizes and expert faculty, V School’s Full-Stack Web Development program is the most certain bridge from little to no coding background into a well paying career as a web developer.

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Getting started with React Native

  • React Native helps you to build apps that no one would ever tell you that you did not use a custom native language such as JAVA or Swift or Objective C. React Native gives you that extra feel.
  • Create React Native App is the easiest way to start building a new React Native application.
  • It allows you to start a project without installing or configuring any tools to build native code – no Xcode or Android Studio installation required.
  • Do a change of directory to the location where you installed the React Native App.
  • NOTE: Create React Native App makes it really easy to run your React Native app on a physical device without setting up a development environment.

Getting to know React Native
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Visualizing transit vehicle locations on a map in real-time

Visualizing transit vehicle locations on a map in real-time:  #ReactJS #JavaScript

  • I could just make requests to the restbus API at and display it on a map.
  • Most browsers block HTTPS websites from requesting insecure resources.Problem #2: I noticed that the public Restbus API went down when I made too many consecutive requests.
  • Running the chrome profiler showed me the following:The component update was taking 359s to update after each API request.
  • I also noticed that network requests take rather long.Let’s see if the restbus API returns any data we do not need.We’re only using a few fields out of this — id, routeId, secsSinceLastReport, lat, lon, and everything else can be ignored.
  • Future improvements to react will have performance optimizations to components declared this way by avoiding unnecessary checks, memory allocations and lifecycle methods.A hack to make functional components faster right now is to call them as functions, as opposed to JSX nodes.const Component = (props) = ( div{props}/div);// Using component in JSX = slowerdiv Component //div// Calling component as a regular function in curly braces = fasterdiv {Component()}/divAlthough I haven’t profiled it yet, there are several blog posts that report a big speedup.

In this blog post I’ll talk about how I built a visualization of Toronto Transit vehicle locations and some of the engineering challenges I ran into. A working demo can be found on my personal…
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ReactJs: Using stores to improve your code – Doyin Olarewaju – Medium

ReactJs: Using stores to improve your code  #reactjs #react #javascript #reactjs

  • ImagesOne of the first steps i take is to create an ImageStore.
  • This helps me keep all images in one place, helps ensure my images are compiled with react and also helps me not worry about relative links to my app root.So some code://say the name of this file is ImageStore located at stores/ImageStoreimport UserImage from FriendImage from default { UserImage, FriendImage}Then to import it in your viewsimport ImageStore from ‘.
  • /stores/ImageStore// excluded some imports for brevity sake………export default class TestClass extends Component {render() img src={ImageStore.UserImage} alt=’User’ / … … }}Thats it.
  • Just add all images you wish to use in your app into the store and import the ImageStore.
  • No relative links required, the image gets compiled into your app and best of all, if the image location needs to change for any reason all you need to do is change in the ImageStore file and it changes everywhere.

I’m a sucker for well written code. When code is badly written, the app kinda gets boring and it becomes a task to work on the codebase. I love stores in js, especially since es6. Simple classes with…
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Using JSX and React #React #reactjs #javascript #Framework #programming

Using JSX and React  #React #reactjs #javascript #Framework #programming

  • You use JSX within React code to easily create components for your apps.
  • Here is an example of JSX being used to render HTML:

    To create a component, just use a local variable that starts with an upper-case letter, e.g.:

    Note: There are reserved words in JSX, as it is essentially JavaScript after all—so keywords such as and are discouraged as attribute names.

  • Form creation is easy with JSX and sub-components, for example:

    To make this work, you must create the sub-components as attributes of the main component:

    To use some JavaScript to create a result for use in an attribute value, React just needs you to wrap it in curly braces like so:

    You can also just pass a boolean value for form attributes such as , and so on.

  • First we use to establish signalling of a new user connected via the as so:

    Then, to connect to the PeerServer, we use the following:

    We then listen for events via the method:

    We also have our JSX inside components in the directory.

  • Now it’s as simple as pushing your code to heroku:

    Once the push is finished, you will be able to start your web service with the following:

    Now just visit the URL provided, or as a shortcut use the command as so:

    You’ve learned how to create JSX components and interface them with React, with a detailed example of the chat application.

What You’ll Be CreatingJSX is similar to a mix of XML and HTML. You use JSX within React code to easily create components for your apps. JSX transforms into JavaScript when React compiles the…
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http://landing.vschool.io/full-stack-javascript/

Deploying apps.
Cause that's what we do.
More at:  #reactjs #javascript #vschool

  • Through our elite curriculum, small class sizes and expert faculty, V School’s Full-Stack Web Development program is the most certain bridge from little to no coding background into a well paying career as a web developer.
  • V School has been recently ranked Top Coding Bootcamp 2017 for both our In-Person & Online modalities (switchup.org).
  • Take our courses online from anywhere with V School Interactive!
  • At V School our student body are from all over the globe, so whether you travel frequently, don’t happen to live close to one of our campuses, or just prefer online education, V School’s award winning Online / Interactive modality is literally changing the way people learn to code.
  • For a fraction of the time / recourses that you might invest in traditional ed, V School equips you with a tool kit of essential skills & languages that ready you for a career in technology now.


Through our elite curriculum, small class sizes and expert faculty, V School’s Full-Stack Web Development program is the most certain bridge from little to no coding background into a well paying career as a web developer.

Continue reading “http://landing.vschool.io/full-stack-javascript/”