Readme.md

Prototype

exercise01

fill in the blanks to make the program work:

(function() {
  var larger = function(o1, o2) {
    if ( o1.size > o2.size ) {
        console.log('o1 is larger');
    } else {
        console.log('o2 is larger');
    }
  };
  
  var x = // write code here
  var y = // write code here
  
  larger(x, y);    
}());

exercise02

fill in the blanks to make the program work:

(function() {
  var favorite_album = function( collection ) {
    // do nothing if got an empty collection
    if ( collection.length === 0 ) {
      return;
    }

    // define two variables and initialize them
    var max_played = collection[0].played,
      max_index  = 0;

    for ( var i=0, len = collection.length; i < len; i++ ) {
      if ( collection[i].played > max_played ) {
        max_played = collection[i].played;
        max_index  = i;
      }
    }

    return { play: max_played, index: max_index };
  };

  var music = // write code here

  var fav = favorite_album( music );

  console.log( "Your favorite album was played " + fav.play + " times" );

  // Bonus: Write code here to make the following line print the above line
  console.log( fav );
}());

exercise03

implement a Summer objects with two methods: getCurrentSum()and add(number). Run the following main code to make sure everything works:

(function () {
  // write your code here to make the program work 

  var s1 = Summer();
  var s2 = Summer();
 
  s1.add(10);
  s1.add(20);
 
  s2.add(30);
 
  s2.add(5);
 
  // prints 30
  console.log(s1.getCurrentSum());
 
  // prints 35
  console.log(s2.getCurrentSum());
 
}());

exercise04

fill in the blanks to make the program work:

(function () {
  var person = {
    // fill code here
  };

  var  car = {
    // fill code here
  };

  // print Vrum Vrum
  car.drive();
 
  // print I'm rich
  if ( car.price > 1000 ) {
    person.buy(car);
  }
}());



(function () {
  var employees = // fill code here;

  for (var i=0; i < employees.length; ++i ) {
    // print I work at IBM
    employees[i].hello();
  }
}());

exercise05

implement the following Bingo object. The Bingo object should randomize a number between 1 and 10 on creation and provide a single method guess(number). That method should return true if the argument was the secret number. Test your class.

exercise06

implement a MusicBox object that should make the following code work well:

(function() {
// Write your code here  

  var box = MusicBox();
  var a1 = Album("The Who", "Tommy");
  var a2 = Album("Tom Waits", "Closing Time");
  var a3 = Album("John Cale", "Paris 1919");
  var favorite;
 
  box.addAlbum(a1);
  box.addAlbum(a2);
  box.addAlbum(a3);
 
  a1.play() ; // prints "Playing The Who - Tommy"
  a2.play(); // prints "Playing Tom Waits - Closing Time"  
  a1.play(); // prints "Playing The Who - Tommy"
 
  favorite = box.favoriteAlbum(); 
 
  // prints "favorite album is The Who - Tommy"
  console.log("favorite album is " + favorite); 
}());

exercise06a

can you also write it so that box.addAlbum(a1, a2, a3) will work ? how ?

exercise07

write the functions that will make the following code work:

(function () {
  // Code goes here

  var album = PhotoAlbum();
  var p;
 
  p = Photo("Paris Trip 1");
  p.tag("Jimmy");
  p.tag("Jane");
  p.tag("Jeff");
 
  album.addPicture(p);
 
  p = Photo("Look the Eiffel");
  p.tag("Jimmy");
  p.tag("Max");
  album.addPicture(p);
 
  p = Photo("OMG it's so high");
  p.tag("Jimmy");
  p.tag("Jane");
 
  // prints "Jimmy, Jane"
  p.showTags();
 
  album.addPicture(p);
 
  // prints "Paris Trip 1, Look the Eiffel, OMG it's so high"
  album.showPictures("Jimmy");
 
  // prints "Paris Trip 1, OMG it's so high"
  album.showPictures("Jane");    
}());

exercise08

write a constructor function Point2D
that create a 2D point given its x and y coordinates.

exercise08a

write a contructor function Edge
that create an edge given its two vertices (i.e. two points).

exercise08b

write a method length for Edge
that compute the length of the edge.

exercise09

write a constructor function Trinagle
that create a triangle given its three edges.

exercise09a

write a method perimeter for Triangle
that compute the perimeter of the triangle.

exercise09b

write a method area for Triangle
that compute the area of the triangle
(Do you remeber the Erone's formula?).