React, Facebook's JavaScript library project for user interfaces, is moving away from the trend toward reactive programming and offering instead an approach common to game engines by redrawing a page with every frame as "an immediate-mode renderer," according to development team member Pete Hunt. Using this approach required React developers to create a special tool to help the browser redraw each scene. "This is actually a fundamentally different mental model for building user interfaces. This isn't just a different syntax of the same old ideas," says Hunt.

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