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Summary
Practical guide on when to split functions vs. when not to, illustrated with a real React codebase example. Core insight: length alone is not a reliable indicator — over-splitting creates a “jumping between functions” readability problem worse than a long function.
關於何時拆分函數的實用指南，以 React 真實程式碼為例。核心見解：長度本身不是可靠的指標——過度拆分造成的「在函數間跳躍」可讀性問題可能比一個長函數更糟糕。
Key Points
- Anti-pattern: splitting functions based on length alone — causes cognitive overhead from context-switching
- When to split: (1) multiple responsibilities (name requires more than one verb, like “validateAndProcess”), (2) code reuse across multiple call sites, (3) testability of isolated logic
- When NOT to split: when the resulting functions are too small/atomic to be independently meaningful; when the logic is inherently sequential and cohesive
- Real-world trigger: author over-split a greedy algorithm during refactoring, making it harder to understand
Insights
The “name requires more than one verb” heuristic is immediately actionable — if you can’t name a function with a single clear verb phrase, it’s likely doing multiple things. The counter-argument to “always split small” is important: a function that exists in only one place and is not independently testable provides no value from extraction, only navigation overhead. The tension between “short functions = good” (Clean Code school) and “keep related logic together” (locality of behavior school) is the real debate underlying this article.
Connections
Raw Excerpt
If you’re trying to name a function and find yourself using more than one verb (e.g., validateAndProcessData), it’s a sign that the function is doing more than one thing.