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I guess if learning 90% of something takes 90 minutes, the remaining 10% will take 10 years.

And that is where problems start with keen and eager junior developers who think by knowing the 90% they really know the 100%.

Absolutely. Not using mutable variables as default arguments = 91%

Unfortunately here in HN we constantly upvote those junior developer's Medium posts.

Blinking LED now in Node.js.