You Don't Know Js: Async & Performance Apr 2026

Why callbacks fail us (it's more than just "nesting") and how Promises solve Inversion of Control .

👉 (and the rest of the series) on GitHub . #JavaScript #WebDev #Coding #SoftwareEngineering #YDKJS You Don't Know JS: Async & Performance

🕒 Stop Guessing, Start Understanding: Async & Performance Why callbacks fail us (it's more than just

Understanding that JS doesn't actually have a concept of "time"—only a queue of events. You Don't Know JS: Async & Performance