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Learn how F# discriminated unions eliminate illegal states and how pattern matching gives you compile‑time exhaustiveness checks for safer domain modeling.
Migrate legacy string/integer constants to PHP 8.1+ backed enums for type-safe domain modeling. Covers validation with ::tryFrom(), exhaustive match expressions, and Doctrine ORM mapping.
Class diagrams rot when they try to document everything. Use them for code-bound scaffolding of domain boundaries, with explicit visibility, multiplicity and composition, and accept partial round-trip engineering.
Boolean flags and nullable fields create combinatorial state bugs. F# Discriminated Unions make illegal states unrepresentable by encoding each valid state as a distinct case with its own required data—verified exhaustive by the compiler.
PHP 8.1 backed enums replace magic strings with type-safe domain values that still serialize to primitives for databases and APIs.
Learn how to decide between sealed classes and classic inheritance in Kotlin. Compare constraints, trade‑offs, and see a hands‑on example with compile‑time exhaustiveness checks.
Stop nesting Result.bind calls in F#. Learn how to use Computation Expressions to create a clean, linear validation pipeline that short-circuits on the first error.
Use Haskell sum types and pattern matching to make illegal payment states unrepresentable. A concrete PaymentMethod ADT shows how the compiler enforces exhaustive handling and self-documenting records, with trade-offs at serialization boundaries.
String constants in PHP are error‑prone. PHP 8.1’s backed enums give you type safety, clearer intent, and easier persistence. This blog walks through the syntax, shows a real‑world order‑status refactor, and explains the trade‑offs you’ll face.
fsharp
php
kotlin
haskell