How JavaScript's Event Loop Manages Multiple Tasks on a Single Thread

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JavaScript is single-threaded, meaning it can execute only one operation at a time on its main call stack. To handle time-consuming tasks like timers, API requests, and user input without freezing execution, JavaScript offloads these operations to browser-provided Web APIs. Once an async operation completes, its callback is placed in a Callback Queue and waits for the call stack to become empty. The Event Loop continuously monitors the call stack and, when it is clear, pushes the next queued callback in for execution. This mechanism allows JavaScript to appear concurrent while remaining fundamentally single-threaded.

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ProgrammingDEV Community ·

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