get selected value on componentdidmount reactjs

let studentData = [
  {
        "roll":5,
        "name":"Sagor",
        "student_type":"normal"
  },
  {
        "roll":6,
        "name":"Humayun Faridi",
        "student_type":"excellent"
  }
]let student = studentData.find(data => data.roll === 5);
console.log(student); //Output: {"roll":5,"name":"Sagor","student_type":"normal"}