#fp-ts

A practical, jargon-free guide to functional programming - the 80/20 approach that gets results without the academic overhead

Quick reference for Either type. Use when user needs error handling, validation, or operations that can fail with typed errors.

Quick reference for TaskEither. Use when user needs async error handling, API calls, or Promise-based operations that can fail.

Quick reference for fp-ts types. Use when user asks which type to use, needs Option/Either/Task decision help, or wants fp-ts imports.

Practical async patterns using TaskEither - clean pipelines instead of try/catch hell, with real API examples

Stop throwing everywhere - handle errors as values using Either and TaskEither for cleaner, more predictable code

Everyday data transformations using functional patterns - arrays, objects, grouping, aggregation, and null-safe access

Functional programming patterns for Node.js/Deno backend development using fp-ts, ReaderTaskEither, and functional dependency injection

Practical patterns for using fp-ts with React - hooks, state, forms, data fetching. Works with React 18/19, Next.js 14/15.

Quick reference for pipe and flow. Use when user needs to chain functions, compose operations, or build data pipelines in fp-ts.

Comprehensive guide for refactoring imperative TypeScript code to fp-ts functional patterns

Quick reference for Option type. Use when user needs to handle nullable values, optional data, or wants to avoid null checks.