const todos = (state = [], action) => {
  if (action.type === 'ADD_TODO') {
    return Object.assign({}, state, [
      ...state,
      {
        name: action.name,
        isCompleted: action.isCompleted,
      }
    ]);
  }
  return state;
};

const visiblityFilter = (state = 'all', action) => {
  switch (action.type) {
    case 'SET_VISIBILITY_FILTER':
      return action.filter
    default:
      return state
  }
};