https://nalar.dev/tags/domain-modeling/ Recent content in Domain Modeling on Nalar Hugo en-us Sat, 05 Sep 2026 00:00:00 +0700 https://nalar.dev/replacing-primitive-data-with-domain-types/ Sat, 05 Sep 2026 00:00:00 +0700 https://nalar.dev/replacing-primitive-data-with-domain-types/ <p>Many bugs begin with a value that is technically valid for its programming-language type but invalid for the job it represents. A quantity is negative. A percentage is passed as <code>20</code> where another function expects <code>0.20</code>. Two string arguments are swapped because both look identical to the type system.</p> <p>The problem is not that strings and numbers are poor types. They are useful building blocks. The problem appears when a primitive value has accumulated rules or meaning that the primitive cannot express.</p>