https://nalar.dev/tags/modularity/ Recent content in Modularity on Nalar Hugo en-us Thu, 03 Sep 2026 00:00:00 +0700 https://nalar.dev/designing-modules-around-cohesion-and-coupling/ Thu, 03 Sep 2026 00:00:00 +0700 https://nalar.dev/designing-modules-around-cohesion-and-coupling/ <p>A codebase can be split into many files and still be difficult to change. A small feature may require edits in several modules, tests may need large fixtures, and one internal change may unexpectedly break distant code.</p> <p>The problem is often not the number of modules. It is where their boundaries are drawn.</p> <p>Two ideas are especially useful when evaluating those boundaries: <strong>cohesion</strong> and <strong>coupling</strong>. Cohesion asks whether the responsibilities inside a module belong together. Coupling asks how much one module depends on the details of another. Used together, they provide a practical way to decide where code should live and which dependencies deserve attention.</p>