class Student {
    fullName: string;
    constructor(
		public firstName: string, 
		public middleInitial: string, 
		public lastName: string
		)
    {
        this.fullName = firstName + " " + middleInitial + " " + lastName;
    }
}

interface Person
{
    firstName: string;
    lastName: string;
}

function greeter(person : Person)
{
    return "Hello, " + person.firstName + " " + person.lastName;
}

let user = new Student("Jane", "M.", "User");

document.body.innerHTML = greeter(user);