Check out a free preview of the full React.js (with Introduction to Flux Architecture) course:
The "JSX vs. Pure JavaScript" Lesson is part of the full, React.js (with Introduction to Flux Architecture) course featured in this preview video. Here's what you'd learn in this lesson:

DOM elements can be created with JavaScript functions or with JSX. JSX is often preferred because it looks like HTML and is easier to visualize. When the application is built, the JSX code is transpiled back into JavaScript functions so there isn’t any performance difference between these two methods.

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