what I didn't write here correctly?

Question

I have to make an application on the Redux-React. But unfortunately I have error:And these are the main project files:<
It looks like your post is mostly code; please add some more details.It looks like your post is mostly code; please add some more details.It looks like your post is mostly code; please add some more details.

And these are the main project files:

app.js(component):

import React from 'react';
import { Component } from 'react';
import { connect } from 'react-redux'
import { fetchData } from '../actions';
import TableData from "./TableData";
import TableSearch from "./TableSearch";

export function searchFilter (search, data) {                                               
  return data.filter(n => n.term.toLowerCase().includes(search));
}

const days = ["23-08-2019", "24-08-2019", "25-08-2019"];        

class Root extends React.Component {

  componentDidMount() {
    this.props.onFetchData(this.props.day);
  }

  render() {
    const { search, shift, data, filteredData, onFilter, onSetSearch, onFetchData } = this.props;

    return (
      <div>
        <TableSearch value={search}
          onChange={(e) => onSetSearch(e.target.value)} 
          onSearch={() => onFilter()} />

        {days.map((day, i) => (
          <button key={day} 
            onClick={() => onFetchData(day)}
            className={i === day ? "active" : ""}>{day}</button>
        ))}
        <br />
        {Object.keys(data).map(n => (
          <button data-shift={n}
            onClick={(e) => onFilter({ shift: e.target.dataset.shift })}
            className={n === shift ? "active" : ""}>{n} shift</button>
        ))}

        <TableData data={filteredData} />

      </div>
    );
  }
}

export const ConnectedRoot = connect(             
  (state) => state,
  (dispatch) => ({
    onFilter: (args) => dispatch({ type: 'RUN_FILTER', ...args }),
    onSetSearch: (search) => dispatch({ type: 'SET_SEARCH', search }),
    onFetchData: (day) => dispatch(fetchData(day))
  })
);

Answer 1

You get data undefined at initial render, first check if data is available and then map through the data:

data && Object.keys(data).map()

---

As per your request, you should use return statement in app.js like:

return (
      <div>
        <TableSearch value={search}
          onChange={(e) => onSetSearch(e.target.value)} 
          onSearch={() => onFilter()} />

        {days && days.map((day, i) => (
          <button key={day} 
            onClick={() => onFetchData(day)}
            className={i === day ? "active" : ""}>{day}</button>
        ))}
        <br />
        {data && Object.keys(data).map(n => (
          <button data-shift={n}
            onClick={(e) => onFilter({ shift: e.target.dataset.shift })}
            className={n === shift ? "active" : ""}>{n} shift</button>
        ))}

        {data && <TableData data={filteredData} /> }

      </div>
    );