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Promises and reality
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Обещания в JavaSctipt
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Кстати, на фоне - диаграмма последовательности вполнения кода в node.js
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Node.js basics ✦ single-threaded ✦ event loop ✦ asynchronous code ✦ callbacks are everywhere
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setInterval(function() { console.log("hi"); }, 1000)
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setInterval(function() { console.log("hi"); while(true) {} }, 1000)
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Callbacks?
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Thank you