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@n3rd1n/monads

v1.0.5

Published

A collection of monad implementations for TypeScript

Readme

@n3rd1n/monads

A collection of monad implementations for TypeScript.

Installation

npm install @n3rd1n/monads

Usage

import { Functor, Optional } from '@n3rd1n/monads'

// Optional - für Werte die null/undefined sein können
const maybeValue = Optional.Maybe(getUserName())
	.map(name => name.toUpperCase())
	.do(name => console.log(name))
	.getOrDefault('Anonymous')

// Functor - für Wert-Transformationen
const result = Functor.From(5)
	.map(x => x * 2)
	.map(x => x.toString())
	.get() // "10"

// Async Operationen
const asyncResult = await Optional.Maybe(userId)
	.mapAsync(id => fetchUser(id))
	.mapAsync(user => fetchPosts(user))
	.await()

API

Optional

Monade für optionale Werte (Alternative zu null/undefined).

  • Optional.Maybe(value) - Erstellt ein Optional aus einem Wert
  • Optional.Just(value) - Erstellt ein Optional mit Wert
  • Optional.None() - Erstellt ein leeres Optional
  • .map(fn) - Transformiert den Wert
  • .mapAsync(fn) - Async Transformation
  • .filter(fn) - Filtert basierend auf Prädikat
  • .do(fn) - Führt Seiteneffekt aus
  • .orElse(fn) - Fallback wenn leer
  • .get() - Gibt Wert zurück (wirft Error wenn leer)
  • .getOrDefault(default) - Gibt Wert oder Default zurück
  • .toNullable() - Konvertiert zu T | null

Functor

Einfache Monade für Wert-Transformationen.

  • Functor.From(value) - Erstellt einen Functor
  • .map(fn) - Transformiert den Wert
  • .mapAsync(fn) - Async Transformation
  • .log(message?) - Loggt den Wert
  • .get() - Gibt den Wert zurück

Development

# Dependencies installieren
npm install

# Build erstellen
npm run build

License

MIT