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add glossary/Event-loop

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Stefan Feješ
2018-07-18 11:25:23 +02:00
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### Event loop
The event loop handles all asynchronous callbacks. Callbacks are queued in a loop, while other code runs, and will run one by one when the response for each one has been received.
The event loop allows JavaScript to perform non-blocking I/O operations, despite the fact that JavaScript is single-threaded.