Why Breaking Functions Into Smaller Parts Makes Code Easier to Reuse

A software developer argues that the most common problem in messy codebases is functions that try to do too much, rather than poor naming or missing comments. The solution, they propose, is designing small, composable functions where each unit handles a single transformation and passes its output to the next. Pure functions — those with no side effects and consistent outputs — are highlighted as the ideal building blocks, while side-effect-heavy functions like data fetching should be kept at the edges of a system. The article also introduces a 'pipe' helper pattern that chains multiple functions together, making it easy to add or remove transformation steps without rewriting logic. This approach, the developer contends, shifts the mindset from solving one-off problems to building a reusable toolbox of reliable, testable components.