const studentData = [
  {
    name: 'Tim',
    status: 'Current student',
    course: 'Biology',
  },
  {
    name: 'Sue',
    status: 'Withdrawn',
    course: 'Mathematics',
  },
  {
    name: 'Liz',
    status: 'On leave',
    course: 'Computer science',
  },
];

function enrollInSummerSchool(students) {
  return students.map(student => {
    return {
      name: student.name,
      status: 'In Summer school',
      course: student.course,
    };
  });
}

/* From here down, you are not expected to understand.... for now :)
  Nothing to see here!

*/

// tests

function testIt() {
  var testData = [
    {
      name: 'Burt',
      status: 'Playing hooky',
      course: 'Biology',
    },
    {
      name: 'Melanie',
      status: 'Sick',
      course: 'Mathematics',
    },
    {
      name: 'Leonard',
      status: 'AWOL',
      course: 'Computer science',
    },
  ];

  var results = enrollInSummerSchool(testData);

  if (!(results && results instanceof Array)) {
    console.error('FAILURE: `enrollSummerSchool` must return an array');
    return;
  }
  var result = testData.every(function(student) {
    var match = results.find(function(_student) {
      return (
        _student.name === student.name &&
        _student.course === student.course &&
        _student.status.toLowerCase() === 'in summer school'
      );
    });
    return match !== undefined;
  });
  if (!result) {
    console.error(
      'FAILURE: `enrollSummerSchool` should return ' +
        'original key/value pairs for each student, and ' +
        'update `status` to "In Summer school": ' +
        JSON.stringify(results)
    );
  } else {
    console.info('SUCCESS: `enrollSummerSchool` is working');
  }
}

testIt();