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fp-either-ref

Reference fp-ts Either patterns for explicit success and failure modeling.

11|3|Updated Jan 30, 2026
Search Tags:#typescript#validation#either#error-handling#functional#fp-ts
One-click install
npx skills add https://github.com/whatiskadudoing/fp-ts-skills --skill fp-either-ref
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: fp-either-ref
Source: https://github.com/whatiskadudoing/fp-ts-skills/tree/main/skills/quick-ref/fp-either-ref
Command: npx skills add https://github.com/whatiskadudoing/fp-ts-skills --skill fp-either-ref

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill provides a compact, immediate reference for common fp-ts Either patterns, helping developers model success and failure explicitly without leaving their IDE.

Core Features & Use Cases

  • Reference: Access Right/Left constructors and common combinators such as map, chain, and getOrElse for concise error handling.
  • Use Case: Validate input data and build straightforward pipelines where errors flow through the Left side.
  • Usage Example: Draft a small validation flow that short-circuits on the first error and returns a user-friendly failure message.

Quick Start

Run the fp-either-ref skill to view a compact example of core Either operations and recommended practices for error handling in TypeScript.

Frequently Asked Questions about fp-either-ref

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I model success and failure explicitly in TypeScript validation pipelines?▼

The fp-ts Either module models success and failure explicitly by wrapping valid results in Right and errors in Left. This allows validation pipelines to short-circuit on the first error and return a user-friendly failure message.

What is the best way to handle errors in fp-ts without try-catch blocks?▼

Use Either combinators like map and chain to transform and sequence operations that might fail. The fold or getOrElse functions extract the final value, providing a default or applying specific logic to the Left error side.

Do I need prior experience with functional programming to use fp-ts Either?▼

Yes, this reference requires familiarity with TypeScript and the fp-ts/Either module. It demonstrates core functions like right, left, map, chain, getOrElse, and fold without introducing foundational functional programming concepts.

How do I short-circuit a TypeScript data validation flow on the first error?▼

Build a validation flow using fp-ts Either where errors flow through the Left side. Chaining operations will short-circuit the pipeline upon encountering the first Left value, bypassing subsequent validation steps.

When should I use the Either monad instead of throwing exceptions in TypeScript?▼

Use the Either monad for control flow scenarios where you need explicit error handling without exceptions. It forces callers to handle both success and failure cases at compile time, making validation logic safer.

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