Part 7: Closing the Loop
What no one teaches you about the JavaScript Event Loop — Part 7 of 8 A puzzle that exposes await async function f() { console.log('A'); await Promise.resolve(); console.log('B'); awa
Jul 11, 202623 min read1
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Articles tagged with #javascript
Part 6: Microtasks and Why Two Queues
What no one teaches you about the JavaScript Event Loop — Part 6 of 8 A puzzle, slightly harder Promise.resolve().then(() => { console.log('1'); Promise.resolve().then(() => console.log('2'))
Jul 11, 202628 min read3Part 4: Where JavaScript Actually Runs
What no one teaches you about the JavaScript Event Loop — Part 4 of 8 A puzzle in DevTools Open any page in your browser. Open DevTools. Click the Performance tab. Hit the record button (the circle).
Jun 17, 202629 min read2Part 3: Where Threads Sleep
What no one teaches you about the JavaScript Event Loop — Part 3 of 8 A different puzzle In Part 2 we left a question hanging. An idle browser tab uses zero CPU. Open your task manager — a tab with n
Jun 17, 202637 min readPart 2: What "Single-Threaded" Actually Means
What no one teaches you about the JavaScript Event Loop — Part 2 of 8 A new puzzle In Part 1, an infinite loop froze the page. The click vanished. We left with a question: what does "JavaScript is si
Jun 14, 202627 min read9Part 1: The Question Tutorials Skip
What no one teaches you about the JavaScript Event Loop — Part 1 of 8 A puzzle to start Open any page in your browser. Open DevTools, go to the console, and paste this: document.body.addEventListener
Jun 14, 202618 min read31