Navigation Bar Java program Java Usage
}
console.log("Hello, World!");
Hello, World!
var msg = "Hello, World!";
console.log(msg);
Hello, World!
function logIt(output) {
    console.log(output);
}
logIt(msg);
Hello, World!
console.log("Reuse of logIT")
logIt("Hello, Students!");
logIt(2022)
Reuse of logIT
Hello, Students!
2022
function logItType(output) {
    console.log(typeof output, ";", output);
}
console.log("Looking at dynamic nature of types in JavaScript")
logItType("hello"); // String
logItType(2020);    // Number
logItType([1, 2, 3]);  // Object is generic for this Array, which similar to Python List
Looking at dynamic nature of types in JavaScript
string ; hello
number ; 2020
object ; [ 1, 2, 3 ]
// define a function to hold data for a Person
function Person(name, ghID, classOf) {
    this.name = name;
    this.ghID = ghID;
    this.classOf = classOf;
    this.role = "";
}

// define a setter for role in Person data
Person.prototype.setRole = function(role) {
    this.role = role;
}

// define a JSON conversion "method" associated with Person
Person.prototype.toJSON = function() {
    const obj = {name: this.name, ghID: this.ghID, classOf: this.classOf, role: this.role};
    const json = JSON.stringify(obj);
    return json;
}

// make a new Person and assign to variable teacher
var teacher = new Person("Mr M", "jm1021", 1977);
teacher.setRole("Teacher");

// output of Object and JSON/string associated with Teacher
logItType(teacher);  // object type is easy to work with in JavaScript
logItType(teacher.toJSON());  // json/string is useful when passing data on internet
object ; Person { name: 'Mr M', ghID: 'jm1021', classOf: 1977, role: 'Teacher' }
string ; {"name":"Mr M","ghID":"jm1021","classOf":1977,"role":"Teacher"}
// define a student Array of Person(s)
var students = [ 
    new Person("Claire", "ClaireChen3", 2024),
    new Person("Aliya", "aliyatang", 2025),
    new Person("Sreeja", "sreejagangapuram", 2024),
    new Person("Ananya", "Ananayag2617", 2025),
];

// define a classroom and build Classroom objects and json
function Classroom(teacher, students){ // 1 teacher, many student
    // start Classroom with Teacher
    teacher.setRole("Teacher");
    this.teacher = teacher;
    this.classroom = [teacher];
    // add each Student to Classroom
    this.students = students;
    this.students.forEach(student => { student.setRole("Student"); this.classroom.push(student); });
    // build json/string format of Classroom
    this.json = [];
    this.classroom.forEach(person => this.json.push(person.toJSON()));
}

// make a CompSci classroom from formerly defined teacher and students
compsci = new Classroom(teacher, students);

// output of Objects and JSON in CompSci classroom
logItType(compsci.classroom);  // constructed classroom object
logItType(compsci.classroom[0].name);  // abstract 1st objects name
logItType(compsci.json[0]);  // show json conversion of 1st object to string
logItType(JSON.parse(compsci.json[0]));  // show JSON.parse inverse of JSON.stringify
object ; [ Person { name: 'Mr M', ghID: 'jm1021', classOf: 1977, role: 'Teacher' },
  Person {
    name: 'Claire',
    ghID: 'ClaireChen3',
    classOf: 2024,
    role: 'Student' },
  Person {
    name: 'Aliya',
    ghID: 'aliyatang',
    classOf: 2025,
    role: 'Student' },
  Person {
    name: 'Sreeja',
    ghID: 'sreejagangapuram',
    classOf: 2024,
    role: 'Student' },
  Person {
    name: 'Ananya',
    ghID: 'Ananayag2617',
    classOf: 2025,
    role: 'Student' } ]
string ; Mr M
string ; {"name":"Mr M","ghID":"jm1021","classOf":1977,"role":"Teacher"}
object ; { name: 'Mr M', ghID: 'jm1021', classOf: 1977, role: 'Teacher' }
// define an HTML conversion "method" associated with Classroom
Classroom.prototype._toHtml = function() {
  // HTML Style is build using inline structure
  var style = (
    "display:inline-block;" +
    "background:black;" +
    "border: 2px solid grey;" +
    "box-shadow: 0.8em 0.4em 0.4em grey;"
  );

  // HTML Body of Table is build as a series of concatenations (+=)
  var body = "";
  // Heading for Array Columns
  body += "<tr>";
  body += "<th><mark>" + "Name" + "</mark></th>";
  body += "<th><mark>" + "GitHub ID" + "</mark></th>";
  body += "<th><mark>" + "Class Of" + "</mark></th>";
  body += "<th><mark>" + "Role" + "</mark></th>";
  body += "</tr>";
  // Data of Array, iterate through each row of compsci.classroom 
  for (var row of compsci.classroom) {
    // tr for each row, a new line
    body += "<tr>";
    // td for each column of data
    body += "<td>" + row.name + "</td>";
    body += "<td>" + row.ghID + "</td>";
    body += "<td>" + row.classOf + "</td>";
    body += "<td>" + row.role + "</td>";
    // tr to end line
    body += "<tr>";
  }

   // Build and HTML fragment of div, table, table body
  return (
    "<div style='" + style + "'>" +
      "<table>" +
        body +
      "</table>" +
    "</div>"
  );

};

// IJavaScript HTML processor receive parameter of defined HTML fragment
$$.html(compsci._toHtml());
</table></div> </div> </div> </div> </div> </div> </div>
Name GitHub ID Class Of Role
Mr M jm1021 1977 Teacher
Claire ClaireChen3 2024 Student
Aliya aliyatang 2025 Student
Sreeja sreejagangapuram 2024 Student
Ananya Ananayag2617 2025 Student