reduce-reducers

Reduce multiple reducers into a single reducer from left to right

Install

npm install reduce-reducers

Usage

import reduceReducers from 'reduce-reducers';

const reducer = reduceReducers(
  (prev, curr) => ({ ...prev, A: prev.A + curr }),
  (prev, curr) => ({ ...prev, B: prev.B * curr })
);

expect(reducer({ A: 1, B: 2 }, 3)).to.deep.equal({ A: 4, B: 6 });
expect(reducer({ A: 5, B: 8 }, 13)).to.deep.equal({ A: 18, B: 104 });

FAQ

Why?

Originally created to combine multiple Redux reducers that correspond to different actions (e.g. like this). Technically works with any reducer, not just with Redux, though I don't know of any other use cases.

What is the difference between reduceReducers and combineReducers?

Take a look at this StackOverflow post: https://stackoverflow.com/questions/48104778/how-does-reducereducers-work