onReadValue

onReadValue - Effect

This effect allow us to read values from the action and to put them directly in the state.

By default, this effect reads action.payload.

Example:

const initialState = {
  aTarget: null
};

const reducerDescription = {
  [actions.READ]: onReadValue()
};

export default createReducer(initialState, reducerDescription);

If we now do:
dispatch({ type: actions.READ, payload: 'Something', target: 'aTarget' });

Then the state will be like:

state = {
  aTarget: 'Something'
};

Custom selectors

onReadValue receives an optional parameter. * selector: It specifies how we are going to read the action and the state and place the result in action.target.
(action, state) => any
By default, is:
action => action.payload