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State Is a Fold Over Events: Functional State in React and Beyond
Your state is the residue of setter calls nobody recorded, which is why the bug won't reproduce. Name what happened as events, let one pure function fold them into state, and every screen your app has ever shown is one replay away.
- Featured
Effects Are Values: Functional Core, Imperative Shell
Your business rules can't be tested because they're welded to fetches, toasts, and analytics calls. Split the program in two: a pure core that decides what should happen and returns it as plain data, and a thin shell that performs it. The mock count drops to zero.
- Featured
Errors Are Values: Functional Error Handling in TypeScript
Updated:Stop throwing, start returning. Model failure as a value with Result, compose fallible steps on a railway, make illegal states unrepresentable, and let TypeScript force you to handle every error — no try/catch required.
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Parse, Don't Validate: Making Bad Input Impossible in TypeScript
Updated:Stop checking the same field in fifteen places. Parse untrusted input once at the boundary into a type that can't be invalid — validation forgets what it learned, parsing keeps the proof in the type — and every downstream check disappears.
Recent Posts
Booleans Lie: Modeling State with Discriminated Unions in TypeScript
Updated:Three booleans give you eight states when you only meant four. Discriminated unions make the illegal ones unrepresentable — model a value as exactly one of a fixed set of shapes and let TypeScript hold you to it.
Six Functional Patterns to Stop Writing Java in JavaScript
Updated:Six concrete moves that turn functional thinking into TypeScript you can ship on Monday — pipelines over loops, expressions over statements, immutable updates, higher-order functions, composition, and closures over classes — refactored on a real orders view.
Your Functions Aren't Functions: Why JavaScript Punishes Your Java Habits
Updated:The word 'function' means two different things, and the one you learned in Java is the one TypeScript keeps punishing. A pragmatic case for thinking in equations, not recipes.
The Functional Mindset: Why Modern React is Forcing Your Hand
Embracing functional programming principles like purity, immutability, and declarative composition is no longer optional in modern React development, as these concepts provide the predictability and stability required to manage complex application state and build scalable architectures.