loops

Reactive UI’s with VanillaJS – Part 1: Pure Functional Style

Last month Chris Coyier wrote a post investigating the question, "When Does a Project Need React?" In other words, when do the benefits of using React (acting as a stand-in for data-driven web frameworks in general), rather than server-side templates and jQuery, outweigh the added complexity of setting up the requisite tooling, build process, dependencies, etc.? A week later, Sacha Greif wrote a counterpoint post arguing why you should always use such a framework for every type of web project. His points included future-proofing, simplified workflow from project to project (a single architecture; no need to keep up with multiple types of project structures), and improved user experience because of client-side re-rendering, even when the content doesn't change very often.

In this pair of posts, I delve into a middle ground: writing reactive-style UI's in plain old JavaScript - no frameworks, no preprocessors.

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Loops in CSS Preprocessors

If you've ever watched old sci-fi flicks, you know how powerful loops can be. Feed your robot nemesis an infinite loop, and kaboom. Robo dust.

Preprocessor loops will not cause dramatic explosions in space (I hope), but they are useful for writing DRY CSS. While everyone is talking about pattern libraries and modular design, most of the focus has been on CSS selectors. No matter what acronym drives your selectors (BEM, OOCSS, SMACSS, ETC), loops can help keep your patterns more readable and maintainable, baking them directly into your code.

We'll take a look at what loops can do, and how to use them in the major CSS preprocessors: Sass, Less, and Stylus. Each language provides a unique syntax, but they all get the job done. There's more than one way to loop a cat.

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