fp-ts-skills

Product types, sum types, semigroups, monoids, Eq, Ord, and building custom type class instances for domain modeling in TypeScript

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

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

Practical patterns for composing functions in TypeScript using pipe, flow, and functional design principles

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

Master Do notation in fp-ts to write readable, sequential functional code without callback hell. Covers bind, apS, let, bindTo and real-world patterns.

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

Core FP concepts including pure functions, currying, composition, and pointfree style - the foundation for mastering functional TypeScript

Practical immutability patterns in TypeScript - spread operators, nested updates, readonly types, and when mutation is actually fine

Functional error handling and nullable value management using fp-ts Option and Either types

Master function composition in fp-ts using pipe and flow for building elegant, type-safe data transformation pipelines

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

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

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

Master functional approaches to side effects including IO types, effect isolation, idempotent operations, and quarantining impure code - essential patterns for reliable TypeScript applications

Functional async patterns using TaskEither for type-safe error handling in TypeScript

Validation patterns using fp-ts with error accumulation, form validation, and API input validation

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

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

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

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.