Technical essay analyzing the evolution of concurrency models in programming, tracing the path from callbacks through promises to async/await. Examines what each wave promised, the problems it solved, and the new challenges it introduced — from the C10K problem through function coloring — and how async/await became the industry standard across JavaScript, Python, Rust, and other languages.
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What Async Promised and What it Delivered —
Async/await emerged as the dominant concurrency model across JavaScript, Python, and Rust by solving callback and promise limitations, but swapped one set of problems (callback hell, inversion of control) for another (function coloring, type system friction).
Wednesday, April 22, 2026 12:00 PM UTC2 MIN READSOURCE: LobstersBY sys://pipeline
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