Node.js runs on a single thread. That's usually fine. The event loop handles I/O concurrency without you thinking about locks, races, or deadlocks. But "single-threaded" has a cost that only shows up under pressure: if your JavaScript monopolizes the CPU, nothing else runs. No timers fire. No network callbacks execute. No I/O completes.
We're delving into our Guardian long read collection to present timeless articles from previous years, each featuring fresh author introductions.
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