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Implement a directive or component using Angular 1.5.x to generate a reusable select box element that allows for the following functionality:

• Requires an Array or a Collection to populate the select box options
• Can enable/disable a blank option in the select box (meaning no selection) through an attribute
• Can provide a custom function to generate the select box option text for each element in the Array/Collection
• Can truncate long select box option text to a specified number of characters (20 by default)
• Can optionally call a parent function when a user changes the select box value
• Generates error markup if the directive is improperly configured
• Bonus: Unit tests and conforming to a linting standard

Using NodeJS and ES6, write a small Express web server that implements a simple ShoutBox application:

• Root server URI ("/") presents users with a form to enter a unique username and a button to start chatting
• Validate user's entered username to ensure it is present and unique, report back errors if not
• If user's username is present and unique, navigate to a page that provides:
  • List of current posts stored by the server (username, post, last updated date/timestamp)
  • Button to add a new posts
  • Each listed post has a button to edit an existing post
• Adding / editing a post presents a simple form for users to add new / edit existing post text with a Save or Cancel button
• Bonus: Unit tests and conforming to a linting standard