Add daily email for 2025-02-27

Smaller modules are more reusable

source/_daily_emails/2025-02-27.md

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+---
+title: Smaller modules are more reusable
+date: 2025-02-27
+permalink: daily/2025/02/27/reusability
+tags:
+  - software-development
+  - drupal
+  - open-source
+cta: ~
+snippet: |
+  The smaller your library or module is, the easier it is to reuse.
+---
+
+When you're writing open source code, such as a PHP library or a Drupal module, the larger it is, the harder it can be to reuse.
+
+Each implementation will have its own requirements and specifics, so why have code that tries to do everything?
+
+The smaller the code, the more reusable it is.
+
+The most reusable code I've written have been in smaller modules, like the [System User][0] and [Null User][1] Drupal modules.
+
+Both are very small and solve a specific problem.
+
+The Null User module is used by the System User module to provide a default if no system user is defined.
+
+It could have been part of the System User module, but extracting it into a separate module makes it more reusable.
+
+It also makes System User leaner, less bloated and more focused on its use case and its own functionality.
+
+This approach is based on the UNIX philosophy of a program doing one thing well, and chaining programs together when needed to solve a larger problem.
+
+Then, if you need, you can extend the code in a custom module or add features [by applying patches][2].
+
+[0]: https://www.drupal.org/project/system_user
+[1]: https://www.drupal.org/project/null_user
+[2]: {{site.url}}/daily/2025/02/24/patch