Author Archives: Ruslan Verbelchuk

React 16 features

React Fiber is a virtual stack frame, with React Fiber being a reimplementation of a stack frame specialized for React components. Each fiber can be thought of as a virtual stack frame where information from the frame is preserved in memory on the heap, and because the info is saved on the heap, you can control and play with the data structures and process the relevant information as needed.

You can find an excellent explanation from Lin Clark in this video.

For more details please check the following links ,

1. What is React Fiber?

2. React Fiber Architecture

3. What Does React 16 Mean for You?

React Fiber is an ongoing reimplementation of React's core algorithm. The main difference between react and react fiber are these new features :-

  1. Incremental Rendering :- React v16.0 includes a completely rewritten server renderer. It’s really fast. It supports streaming, so you can start sending bytes to the client faster

  2. Handle errors in the render API : To make class component an error boundary we define a new lifecycle method called componentDidCatch(error, info). Error Boundaries – React

  3. Return multiple elements from render : With this new feature in React v16.0 now we can also return an array of elements, and string from component’s render method.

  4. Portals : Portals provide a first-class way to render children into a DOM node that exists outside the DOM hierarchy of the parent component.

  5. Fragments : A common pattern in React is for a component to return multiple elements. Fragments let you group a list of children without adding extra nodes to the DOM.

react fiber is using:

React Async Rendering Demo. Contribute to ivan-ha/reactasyncrenderingdemodevelopment by creating an account on GitHub. ;

How to install Jenkins 2.150.1 on Ubuntu 14.04

0. sudo -s
— How to Install Oracle Java 8 on Ubuntu 14.04 LTS —
1. sudo apt-add-repository ppa:webupd8team/java
2. sudo apt-get update
3. sudo apt-get install oracle-java8-installer

— Check the installed Java —-
sudo update-alternatives –config java
sudo update-alternatives –config javac
update-java-alternatives -l
export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
echo “$JAVA_HOME”

— How to install Jenkins on Ubuntu 14.04–


 sudo curl -O
apt-key add

wget -q -O - | sudo apt-key add -
sudo sh -c 'echo deb binary/ > /etc/apt/sources.list.d/jenkins.list'
sudo apt-get update && apt-get upgrade -y
sudo apt-get install jenkins

—— Jenkins start on port 8080 ——
—-> nano /etc/default/jenkins
5. sudo service jenkins restart
6. copy the password from cat /var/lib/jenkins/secrets/initialAdminPassword

7. Install Plugins in Jenkins
–> Login to Jenkins dashboard and navigate to Manage Jenkins >> Manage Plugins >> Available Tab and select the plugins to install

$ sudo netstat -peanut | grep ":8000"
$ lsof -i :8000
sudo mount -o bind /var/tmp /tmp   

Sketch plugins









Stacks and Auto-Layout Sketch Plugin Just like Flex Box in CSS, UIStackView in iOS, and FlexboxLayout in Android – Auto-Layout’s with its new Stacks feature is, once again, changing the game: ;





WEB Security

owasp top 10 security standards


SWAT checklist security standards

JavaScript Resources

Online web-based IDE.

  1. Sencha Fiddle:
  2. Fiddle Meta:
  3. JS Bin:,output.
  4. ShiftEdit is a new web-based IDE for editing HTML/ CSS/ JS and PHP.
    It uses ExtJS and the excellent extensions: FileTreePanel and DDTabPanel.



CSS Reference
An extensive CSS reference with all the important properties and info to learn CSS from the basics

Unicode Character Table

A simple JSON pretty printer. Put JSON in the text area below, click the "Pretty Print JSON" button, and see pretty printed JSON.


Regular expression tester with syntax highlighting, contextual help, video tutorial, reference, and searchable community patterns

Select browsers to compare CSS, HTML5 functions

Plunker is an online community for creating, collaborating on and sharing your web development ideas

A live pastebin for HTML, CSS & JavaScript and a range of processors, including SCSS, CoffeeScript, Jade and more..

A collection of the world's best client-side JavaScript libraries.

Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user’s browser.

xhr-xdr-adapter enables, to the extent possible, support for Cross Origin Resource Sharing (CORS) on Internet Explorer versions 8 and 9 using standard JavaScript libraries.

Character encoding

Tips, Tricks, and Techniques on using Cascading Style Sheets.

Full featured date library for parsing, validating, manipulating, and formatting dates.

An open source CDN for JavaScript and CSS sponsored by CloudFlare.

Visa, Mastercard, Discover, American Express

SSN, Payment Cards generators

UI/UX Resources


  • Web Content Accessibility Guidlines (WCAG)
  • Section 508 (US federal standard)
  • The UX HandBook


  • UXPA – The UX Professionals Association 
  • IxDA – The Interaction Design Association 
  • IAI – The Information Architecture Institute

BJJ Reference

Brasilian Jiu Jitsu Reference  – download the free book.

You’ll have to provide your e-mail address and he will be sending you some really interesting newsletters .

You can unsubscribe at any moment if you wish. There are some very good articles on the site as well.


Be mindful, that in addition to the tons of free articles and videos, he is selling (naturally) apps and DVDs which you really don’t need or obligated to buy. Especially at this point of your journey.

This is the source of the Gracie Jiu Jitsu.

Here you need to sign-up for free membership. You’ll get access to the 6 free lessons and videos with conceptual explanation of their philosophy and mindset. Not all historical facts presented  here are 100% truth (they are not Oracles or saints, some information  is contested and controversial), but everything related to technique and fighting philosophy is rock solid and tested in real life.

FAQ: RESTful web service with Jersey&Jackson

  • How to do output in JSON format

    public JSONObject sayPlainTextHello(@PathParam("id")JSONObject inputJsonObj) {  
    String input = (String) inputJsonObj.get("input");  
    String output="The input you sent is :"+input;  
    JSONObject outputJsonObj = new JSONObject();  
    outputJsonObj.put("output", output);  
    return outputJsonObj;  


    ClientConfig config = new DefaultClientConfig();  
    Client client = Client.create(config);  
    WebResource service = client.resource(getBaseURI());  
    JSONObject inputJsonObj = new JSONObject();  
    inputJsonObj.put("input", "Value"); System.out.println(service.path("rest").path("hello").accept(MediaType.APPLICATION_JSON).entity(inputJsonObj).post(JSONObject.class,JSONObject.class));