Handling the errors in the promise chain.
How to test Connect or Express middleware functions.
Great book for front end engineers and designers.
How to set Git and Grunt to always use same line ending character.
Send basic information with markup to generate low res page preview.
Log loaded files, add code coverage and extra features on the fly.
Developer is more valuable if his / her code does not have to be rewritten for a long time.
Extend simple feature with little functional decorators.