AugurProject/augur-ui

import {
  UPDATE_SELECTED_MARKET_ID,
  CLEAR_SELECTED_MARKET_ID
} from "modules/markets/actions/update-selected-market-id";
import { RESET_STATE } from "modules/app/actions/reset-state";

const DEFAULT_STATE = null;

export default function(selectedMarketId = DEFAULT_STATE, action) {
  switch (action.type) {
    case UPDATE_SELECTED_MARKET_ID:
      return action.data.selectedMarketId;
    case RESET_STATE:
    case CLEAR_SELECTED_MARKET_ID:
      return DEFAULT_STATE;
    default:
      return selectedMarketId;
  }
}