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Roadmap to becoming a developer in 2022
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developer-roadmap/content/roadmaps/107-nodejs/content/104-nodejs-async-programming/104-callbacks.md

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Callbacks

Node.js, being an asynchronous platform, doesn't wait around for things like file I/O to finish - Node.js uses callbacks. A callback is a function called at the completion of a given task; this prevents any blocking, and allows other code to be run in the meantime.

Free Content What are callbacks? Asynchronicity in Programming Languages