onDeleteByIndex - Effect

This effect allow us to delete certain items from arrays according to the index they have.

These deletions are managed via action.payload by default.

Example:

We have this state:

const initialState = {
  objectList: [{ id: 1 }, { id: 2 }, { id: 3 }]
};

And we want to delete objects by index. Then, we'd like to write:

dispatch({ type: actions.DELETE_ITEM, payload: 2 });

if we would like to delete the item with { id: 3 }, leading to:

objectList: [{ id: 1 }, { id: 2 }]

To achieve that, we write this as a reducer:

const reducerDescription = {
  [actions.DELETE_ITEM]: onDeleteByIndex()
};

export default createReducer(initialState, reducerDescription);

onDeleteByIndex effect takes an optional parameter:

selector: Specifies how we deduce the index from the action and the state.
(action, state) => number By default, is:
action => action.payload

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