Unhandled Rejection (TypeError):

state.set is not a function

push…/src/pages/chart/store/reducer.js.webpack_exports.default
C:/Users/41797/Desktop/react/numbers/src/pages/chart/store/reducer.js:16
13 | switch (action.type) {
14 | case constants.GET_CITY_DATA :
15 | console.log(action);

16 | return state.set(‘citySeries’, action.citySeries);
| ^ 17 | default:
18 | return state;
19 | }
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axios__WEBPACK_IMPORTED_MODULE_0___default.a.get.then.res
C:/Users/41797/Desktop/react/numbers/src/pages/chart/store/actionCreators.js:15
12 | return (dispatch) => {
13 | axios.get(‘http://192.168.252.64/monitor/PriceAndProfitByCity’).then((res) => {
14 | const result = res.data;
15 | console.log( dispatch(getCityData(result)))
| ^ 16 | dispatch(getCityData(result))
17 | })
18 | }
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