Solution of Program on http://ronitmukherjee.com/practice-javascript-programs-for-interview/#RMJPQ6

RMPJPQ6.js

//https://jsfiddle.net/mukherjeeronit/bs9k6v37/2/

function main(input) {
  var adultStudentNames = [];

  for (var i = 0; i < input.length; i++) {
    var student = input[i];

    if (student.age >= 18) {
      adultStudentNames.push(student.name);
    }
  }

  console.log("Total Count:- ", adultStudentNames.length);
  console.log("List of Names:- ", adultStudentNames);
}

var input = [{
    name: "Ajay",
    age: 26
  },
  {
    name: "Amit",
    age: 16
  },
  {
    name: "Shikha",
    age: 18
  },
  {
    name: "Manish",
    age: 62
  }
];

main(input);