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Is this a realistic way of writing code?

I tend to 'focus' on one area at a time be that ruby, html, css or javascript, but I don't write ALL my server-side code first, then all my html, etc. etc.

Does anybody actually do this?

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Ruby is back-end code, this article is for front-end developers. That being said, you can do a large chunk of the back-end without needing any front-end code. When it does come time to writing the front-end, you should focus on only front-end. Once it's done, you can merge the two. A possible exception to the rule would be full JS web applications.

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