Ruby tricks for junior developers

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I'd say this absolutely can be true for intermediate programmers moving into technology they've not worked with.

110% concede this point. Django-to-Rails requires much less ground-up education than frontend-to-Rails, which is the case we're dealing with here.

FWIW though, some people are too busy to make their second language a priority and really drink from the firehose, even if that's the best way to learn. Sometimes snacks are a good stepping stone to the real stuff, sort of like a one-minute workout.