Can you explain undefined and null

http://stackabuse.com/using-global-variables-in-node-js/ origin - http://www.pipiscrew.com/2017/06/using-global-variables-in-node-js/ using-global-variables-in-node-js

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https://github.com/hyperapp/hyperapp sample https://codepen.io/hyperapp/pen/zNxZLP?editors=0010 origin - http://www.pipiscrew.com/?p=8702 1kb-javascript-library-for-building-front-end-applications