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From my perspective Rails popularized (perhaps even normalized) tdd, which I think is probably a significant contribution to programming culture.

Or were high-ceremony Java enterprise folk doing tdd all along and rails just adopted it? I don't know but I suspect they were at best pretending to

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high-ceremony Java enterprise folk - is that a way of not including a "lightning rod" or layers of linkbait and trolling? Because I think of the work of "Java enterprise folk" in different terms. "Bloatware", "boilerplate", "marching morons" and a number of other more derogatory terms come to mind.

People were doing TDD for sure (at least I can tell so in .Net and Java) before Rails was released.

IMO though, Rails moved this from "something done by advanced programmers" to "something done most of the time".

The most brilliant contribution for me was: the migrations.

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