ih-black-lion/lib/reducers/ReducerDocs.md

State handler for Arus projects

# Redux Reducers

To better understand reducers, it's advisable to read the [Redux Reducers docs](http://redux.js.org/docs/basics/Reducers.html).

Many of our reducers take the form seen below
```js
import { REQUEST_PROFILE, RECEIVE_PROFILE, INVALIDATE_PROFILE } from '../actionTypes';

// Normally the following consts are imported, as they are very common throughout all our reducers.
const initState = {
  isFetching: false,
  didInvalidate: false
};

const request = state => ({ ...state, isFetching: true });
const invalidate = state => ({ ...state, didInvalidate: true });
const receive = (state, action) => {
  const nextState = { data: action.response, isFetching: false, didInvalidate: false };
  return { ...state, ...nextState };
};

export default function(state = initState, action) {
  switch (action.type) {
    case REQUEST_PROFILE:
      return request(state, action);
    case RECEIVE_PROFILE:
      return receive(state, action);
    case INVALIDATE_PROFILE:
      return invalidate(state, action);
    default:
      return state;
  }
}
```