--- title: "#refactoring articles | Hashnode" description: "Explore 653 articles tagged #refactoring on Hashnode. Tutorials, guides, and how-tos from the community." url: "https://hashnode.com/tag/refactoring" --- Tag # #refactoring 653 posts · 38 followers [ZyVOP](https://hashnode.com/@zyvop) · [2d ago](https://hashnode.com/posts/clean-code-design-patterns-writing-code-other-people-and-future-you-can-read-nydd6/6af04e24dce5cc6d07baad5b) ### [Clean Code & Design Patterns: Writing Code Other People (and Future You) Can Read](https://blog.zyvop.com/clean-code-design-patterns-writing-code-other-people-and-future-you-can-read-nydd6?utm_source=hashnode&utm_medium=feed) Write code other people can read and change: naming, small functions, safe refactoring, SOLID without the dogma, and the design patterns that actually show up in AI apps. 28 min read · [blog.zyvop.com](https://blog.zyvop.com/clean-code-design-patterns-writing-code-other-people-and-future-you-can-read-nydd6?utm_source=hashnode&utm_medium=feed) [Powerduck](https://hashnode.com/@powerduck) · [Oct 26](https://hashnode.com/posts/agent-extracted-helper-merged-two-error-paths/6adfa9b106c3f0509df1add3) ### [The agent extracted a shared helper and merged two callers' error paths](https://blogs.powerduck.com/agent-extracted-helper-merged-two-error-paths?utm_source=hashnode&utm_medium=feed) Two routes shared an upstream call, so the agent lifted the block into one helper. The callers differed only on fault: one rethrew for a 500, the other served a cached fallback. The helper picked one exit, the harder caller silently degraded, and green tests missed it. 4 min read · [blogs.powerduck.com](https://blogs.powerduck.com/agent-extracted-helper-merged-two-error-paths?utm_source=hashnode&utm_medium=feed) [Powerduck](https://hashnode.com/@powerduck) · [Oct 21](https://hashnode.com/posts/agent-renamed-symbol-left-old-name-in-error-string/6ad93c75d081e687ef224be7) ### [The Agent Renamed the Symbol but Left the Old Name in the Error String](https://blogs.powerduck.com/agent-renamed-symbol-left-old-name-in-error-string?utm_source=hashnode&utm_medium=feed) The agent renamed the class, updated every reference, and CI went green. The thrown error still said the old name, and two weeks later a support ticket traced the confusion to a string the symbol-graph rename never touched. 5 min read · [blogs.powerduck.com](https://blogs.powerduck.com/agent-renamed-symbol-left-old-name-in-error-string?utm_source=hashnode&utm_medium=feed) [Powerduck](https://hashnode.com/@powerduck) · [Oct 20](https://hashnode.com/posts/agent-split-giant-pr-three-smaller-bugs/6ad7ce293f99e13a32ff72be) ### [The agent split the giant PR into three smaller PRs — and the bug that lived between them stayed invisible](https://blogs.powerduck.com/agent-split-giant-pr-three-smaller-bugs?utm_source=hashnode&utm_medium=feed) Splitting a 3000-line PR feels like rigor. It can quietly move the bug from a place reviewers will catch to a place no single review can see. 5 min read · [blogs.powerduck.com](https://blogs.powerduck.com/agent-split-giant-pr-three-smaller-bugs?utm_source=hashnode&utm_medium=feed) [Powerduck](https://hashnode.com/@powerduck) · [Oct 20](https://hashnode.com/posts/agent-premature-cache-from-stale-comment/6ad714a7341851b46e8a01a2) ### [The Agent Added a Cache Layer Because the Comment Said This Function Was Slow](https://blogs.powerduck.com/agent-premature-cache-from-stale-comment?utm_source=hashnode&utm_medium=feed) A stale comment claimed the function was slow, so the agent built a TTL cache around it. The function had been milliseconds fast for two years. The cache just made invalidity the default. 4 min read · [blogs.powerduck.com](https://blogs.powerduck.com/agent-premature-cache-from-stale-comment?utm_source=hashnode&utm_medium=feed) [Powerduck](https://hashnode.com/@powerduck) · [Oct 17](https://hashnode.com/posts/agent-if-chain-to-lookup-map-drops-side-effect/6ad2c08c020cc1cf77f5e713) ### [The Agent Converted the If/Else Chain to a Lookup Map and Dropped the Side Effect](https://blogs.powerduck.com/agent-if-chain-to-lookup-map-drops-side-effect?utm_source=hashnode&utm_medium=feed) An agent converts an if/else chain to a lookup map for cleanliness. TypeScript is green, tests pass, but one branch's logging and metrics call quietly disappears. 3 min read · [blogs.powerduck.com](https://blogs.powerduck.com/agent-if-chain-to-lookup-map-drops-side-effect?utm_source=hashnode&utm_medium=feed) [2](https://hashnode.com/posts/agent-if-chain-to-lookup-map-drops-side-effect/6ad2c08c020cc1cf77f5e713) [Powerduck](https://hashnode.com/@powerduck) · [Oct 16](https://hashnode.com/posts/agent-adds-unnecessary-await-breaks-sync-caller/6ad2b3689da64d85e06c3f7c) ### [The Agent Added an Await to a Synchronous Function. The Caller Didn't Notice.](https://blogs.powerduck.com/agent-adds-unnecessary-await-breaks-sync-caller?utm_source=hashnode&utm_medium=feed) An agent 'modernized' a sync function by marking it async. TypeScript was happy. The production caller that destructured the return value synchronously started crashing at runtime. 3 min read · [blogs.powerduck.com](https://blogs.powerduck.com/agent-adds-unnecessary-await-breaks-sync-caller?utm_source=hashnode&utm_medium=feed) [Powerduck](https://hashnode.com/@powerduck) · [Oct 16](https://hashnode.com/posts/agent-flattens-custom-error-types/6ad26c27da50e2d3dbc68193) ### [The Agent Flattened Your Custom Error Type Into a Generic Error](https://blogs.powerduck.com/agent-flattens-custom-error-types?utm_source=hashnode&utm_medium=feed) A refactor that looks like a cleanup — until callers that matched on your specific error type start silently falling through to a different branch. 3 min read · [blogs.powerduck.com](https://blogs.powerduck.com/agent-flattens-custom-error-types?utm_source=hashnode&utm_medium=feed) [Powerduck](https://hashnode.com/@powerduck) · [Oct 16](https://hashnode.com/posts/agent-deletes-the-workaround-comment/6ad296776ff34c5cf5a8fe2a) ### [The Agent Deleted the Comment That Explained Why the Code Looks Weird](https://blogs.powerduck.com/agent-deletes-the-workaround-comment?utm_source=hashnode&utm_medium=feed) The function looked ugly on purpose. The comment said why. The agent "cleaned it up" and now the next engineer has to rediscover the workaround the hard way. 4 min read · [blogs.powerduck.com](https://blogs.powerduck.com/agent-deletes-the-workaround-comment?utm_source=hashnode&utm_medium=feed) [1](https://hashnode.com/posts/agent-deletes-the-workaround-comment/6ad296776ff34c5cf5a8fe2a) [Powerduck](https://hashnode.com/@powerduck) · [Oct 16](https://hashnode.com/posts/agent-refactor-doubles-runtime/6ad27a4715278d924cebd773) ### [The agent refactored that tiny function for clarity. It doubled the runtime.](https://blogs.powerduck.com/agent-refactor-doubles-runtime?utm_source=hashnode&utm_medium=feed) A clean-looking diff passed every test. The function was called 40k times per request. We didn't notice until p95 spiked. 3 min read · [blogs.powerduck.com](https://blogs.powerduck.com/agent-refactor-doubles-runtime?utm_source=hashnode&utm_medium=feed)