April 22, 2026
Promises, drama, and a crash or two
What Async Promised and What It Delivered
From “hell” to hope to headaches — devs are hilariously split
TLDR: The piece explains how we moved from callbacks to promises to async/await to handle tons of users without bogging down servers, but new error headaches appeared. Commenters split between “just learn it, it’s great,” “these flaws always existed,” and calls for safer systems—because reliability beats speed if your app keeps crashing.
Async programming promised speed without the chaos of thousands of threads, and the article breaks down how we got here: first callbacks (aka “call me when it’s done”), then Promises/Futures ("we’ll deliver later"), and finally async/await (write it like normal steps). It fixed performance, then broke our brains, then tried to make it readable again. But the comments? That’s where the fireworks are.
One camp is pure hype. “Just learn it,” cheers andrewstuart, basically telling the internet to toughen up because async/await is “massively rewarding.” Meanwhile, the skeptics roll their eyes. joelwilliamson points out that the scary stuff—like “function coloring” and swallowed errors—didn’t magically appear with new tools; they’ve always lurked underneath. Paulddraper piles on: when the article notes that Node.js had to change unhandled promise errors from quiet warnings to full-on crashes (and browsers added special events), he deadpans, “Java has this too.” Translation: this isn’t just a JavaScript drama.
The meta-joke? A commenter waits for the author to get to effect systems—the academic-sounding, all-in-one safety net—as if season 7 of this series will unveil the hero that finally tames the chaos. In between, folks revive classics like callback hell memes and the “pyramid of doom,” while the article reminds us why this matters: serving 10,000 users at once without melting servers is hard—and the error handling is harder.
Key Points
- •OS threads are resource-intensive, making thread-per-connection models unsuitable for high-concurrency servers (the C10K problem).
- •Event loops and callbacks enabled multiplexing many connections onto few threads, exemplified by Node.js and Nginx.
- •Callbacks improved performance but introduced control-flow inversion, fragmented error handling, and lacked general cancellation.
- •Promises/futures return handles to eventual results, improving composability and centralizing error handling.
- •JavaScript standardized Promises in ES2015 (influenced by Promises/A+), and Java 8 introduced CompletableFuture, bringing futures into mainstream use.