Code Snippets.

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1. 25 August 20262 min read

   Web Workers: move heavy work off the main thread

   Heavy JavaScript freezes the page because it shares a thread with the interface. A Web Worker runs that work in the background. A working example and the limits to know.

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2. 20 August 20262 min read

   Promise.allSettled: keep the results that succeeded

   Promise.all throws away every result when one request fails. Promise.allSettled waits for all of them and reports each outcome, so one failure cannot empty a page.

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3. 11 August 20262 min read

   Intersection Observer: react when elements scroll into view

   Scroll listeners that measure element positions are slow and fiddly. Intersection Observer tells you when an element enters the viewport, with a few lines of code.

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4. 7 August 20262 min read

   structuredClone: deep copy objects in JavaScript

   The spread operator copies only one level, and the JSON trick loses dates and breaks on cycles. structuredClone makes a true deep copy with one built-in call.

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