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JavaScript Promises: an Introduction  |  Web  |  Google Developers

Jake Archibald

JavaScript is single threaded, meaning that two bits of script cannot run at the same time; they have to run one after another. In browsers, JavaScript shares a thread with a load of other stuff that differs from browser to browser. But typically JavaScript is in the same queue as painting, updating styles, and handling user actions (such as highlighting text and interacting with form controls). Activity in one of these things delays the others.

url: https://developers.google.com/web/fundamentals/getting-started/primers/promises

type: article, format: page

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