I have student data. I want to filter and display names and IDs based on date. I can select the date but once I choose a date the dropdown menu shows only that particular date, not the other dates. I want to see all the dates whenever I click the input field. Could you please guide me on what I am doing wrong in my code?

const students = [
  {
    id: 1,
    name: "Tobe",    
    jdate: "12/2/2021",
  },
  {
    id: 2,
    name: "Nina",
    jdate: "15/2/2021",
  },
  {
    id: 3,
    name: "Mike",
    jdate: "12/2/2021",
  },
  {
    id: 4,
    name: "Scott",
    jdate: "14/2/2021",
  },
  {
    id: 5,
    name: "Carlos",
    jdate: "13/2/2021",
  },
  
]

function App() {
const [filterStudent, setFilterStudent] = useState(students);
const[jDate, setJDate] = useState("")

  const dates = Array.from(
    new Set(filterStudent.map(st => st.jdate))
  )

    useEffect(() => {
    setFilterStudent(
      filterStudent.filter(st => {
        return (
          (!jDate || jDate === st.jdate) )
      })
    )
  }, [jDate])
 
 
  return (
    <div className="App">
     <div>
      <select onChange={e => setJDate(e.target.value)} value={jDate}>
        <option value="" disabled default selected>
          Select Date
        </option>
        {dates.map(dt => {
          return <option key={dt}>{dt}</option>
        })}
      </select>      
      </div>
      <ul>
        {filterStudent.map(st => {
          const { name,  id, date} = st
          return (
            <li key={id}>
              <div>
                Name: <strong>{name}</strong>
              </div>              
              <div>ID: {id}</div>
              <div>Joining Date: {date}</div>
            </li>
          )
        })}
 
      </ul>
    </div>
  )
}

In the 2nd image, I want to see all the dates.

>Solution :

In Line36 : replace students instead of filterStudent :

  const dates = Array.from(new Set(students.map((st) => st.jdate)));

filteredStudent's dates just contains selected date but students array contains all of dates!!!
Is that what you want meant?

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