# redux-transduce

> Use transducers to create Redux reducers

Latest version **0.1.0** (published 2015-07-05) · MIT license · 0 weekly downloads

## Install

```sh
npm install redux-transduce
pnpm add redux-transduce
yarn add redux-transduce
bun add redux-transduce
```

## Health

**Score 15/100 (F)** — status: abandoned.

Positive: no vulnerabilities.

Warnings: low downloads; no types; no esm support; pre 1.0.

Negative: abandoned; low maintenance score.

## Facts

| | |
|---|---|
| Version | 0.1.0 |
| Published | 2015-07-05 |
| First published | 2015-07-05 |
| Weekly downloads | 0 |
| License | MIT |
| TypeScript types | none |
| Module format | CommonJS |
| Dependencies | 0 |
| Known vulnerabilities | 0 |
| Install scripts | no |
| Author | Andrew Clark |
| Maintainers | acdlite |
| Keywords | redux, transducers, transduce, flux |

## Links

- npm: https://www.npmjs.com/package/redux-transduce
- npm.io page: https://npm.io/package/redux-transduce

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## Recent versions

- 0.1.0 (latest) — 2015-07-05

## README

redux-transduce
===============

[![build status](https://img.shields.io/travis/acdlite/redux-transduce/master.svg?style=flat-square)](https://travis-ci.org/acdlite/redux-transduce)
[![npm version](https://img.shields.io/npm/v/redux-transduce.svg?style=flat-square)](https://www.npmjs.com/package/redux-transduce)

Use transducers to create Redux reducers. Conforms to the [transducer protocol](https://github.com/cognitect-labs/transducers-js#the-transducer-protocol) used by [transducers.js](https://github.com/jlongster/transducers.js) and [transducers-js](https://github.com/cognitect-labs/transducers-js), and is tested against those libraries.

```js
npm install --save redux-transduce
```

## `transduce(xform, reducer)`

`transduce()` creates a reducer from a transducer and a base reducer. The transformation is applied before being sent to the base reducer.


## Caveat: not all transducers are supported

Transducers typically operate on collections. It's possible to use transducers to transform asynchronous streams, but it requires the use of local state that persists over time. We can't do this, because Redux makes a hard assumption that the reducer is a pure function -- it must return the same result for a given state and action, every time.

For this reason, `transduce()` transforms actions one at a time. That means transducers like `filter()` and `map()` work fine, but `take()` and `dedupe()` do not.


## Simple example: filtering action types

```js
import { filter } from 'transducers.js';
import transduce from 'redux-transduce';

const addTodoReducer = transduce(
  filter(action => action.type === 'ADD_TODO'),
  (state, action) => ({ ...state, todos: [...state.todos, action.payload })
);

const removeTodoReducer = transduce(
  filter(action => action.type === 'ADD_TODO'),
  (state, action) => ({ ...state, todos: todos.filter(t => t.id !== action.payload.id) })
);

// Combine into a single reducer with reduce-reducers
// https://github.com/acdlite/reduce-reducers
import reduceReducers from 'reduce-reducers';
const todoReducer = reduceReducers(addTodoReducer, removeTodoReducer);
```

---
_Source: https://npm.io/package/redux-transduce · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._