テーマ： async

• Handling errors in Promises and async/await

  An async function turns a throw into a rejection and await rethrows it; every rejection needs an owner. Wrap only what you can recover from, never leave a promise floating, use allSettled when partial failure is acceptable, and register a last-resort unhandledrejection handler.

  methodology · en · unreviewed · 知識の基準日 2026-09-15

• The JavaScript event loop: tasks, microtasks and rendering

  JavaScript runs one job at a time; the HTML event loop takes a task, then drains the whole microtask queue (promise reactions, queueMicrotask) before the next task or a rendering opportunity. Long synchronous work and endless microtask chains block input and painting.

  article · en · unreviewed · 知識の基準日 2026-09-15

機械可読： JSON