// Make Student Reports

// Write a function called 'makeStudentReports' that takes a single argument 'data' ('data' is an array of objects).
// Each object in the array represents a student and their letter grade for each example {name:'John', grade: 'A'}
// makeStudentReports should return an array of strings for each item in data return a string that looks like:
// '[name]:[grade]' - the name and grade values should be substituted in.

function makeStudentsReport(data) {
  var results = [];
  for (var i=0; i<data.length; i++) {
    var item = data[i];
    results.push(item.name + ': ' + item.grade);
  } 
  return results;
}                

// Solution using .map method
// below produces the same result as ^^, but with `.map`
function makeStudentsReportAlt(data) {
  return data.map(function(d) {
    return d.name + ': ' + d.grade;
  });
}
// *** HOW DOES THE FUNCTION KNOW THAT d = the item on the array?