The Myth of Single-Threaded JavaScript: Inside the Language’s Hidden Concurrency Engine

29/10/2025 18 min
The Myth of Single-Threaded JavaScript: Inside the Language’s Hidden Concurrency Engine

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Episode Synopsis



This story was originally published on HackerNoon at: https://hackernoon.com/the-myth-of-single-threaded-javascript-inside-the-languages-hidden-concurrency-engine.
Explore the concurrency model of modern JavaScript, including the event loop, async/await, and more.
Check more stories related to programming at: https://hackernoon.com/c/programming.
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Modern JavaScript offers a rich (although muddled) concurrency landscape. From the event loop and. async/await to Web Workers, async iterators, and Shared.ArrayBuffers. Understanding how these layers of concurrency interact is essential for building responsive UIs, scalable backends, and reliable serverless functions.


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