ReactJs Initializing state in Class Component and updating state with setState method. Understanding how Virtual DOM works.

code samples from this tutorial
* https://github.com/techsithgit/react-understanding-state-props.git
Steps of running this code example
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$git clone https://github.com/techsithgit/react-understanding-state-props.git
$cd react-understanding-state-props
$npm install
$npm start

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* http://www.youtube.com/timedtext_video?v=DJtI3Pogd88&ref=share