Code Year 2012 - Week 5

Week 4を飛ばしてWeek 5。Week 4はJavaScriptの基本的な部分だったので正直あまり面白くなかった。
Week 5は面白かった。Constructorメソッドやら、オブジェクトリテラルやら。
Week 6も結構楽しみ。

	// 1. We've come a long, long...
	var answer = true;
	// 2. Through the hard times...
	// Here is an array of multiples of 8. But is it correct?
	var multiplesOfEight = [8,16,24,32,40,58];
	// Test to see if a number from the array is NOT a true
	// multiple of eight. Real multiples will return false.
	var answer = multiplesOfEight[5] % 8 !== 0;
	// 3. ...And the good!
	for(var n = 0; n < 20; n++){
	var m = n + 1;
	if(0 === m % 3){
	if(0 === m % 5) {
	console.log("FizzBuzz");
	}else{
	console.log("Fizz");
	}
	}else if(0 === m % 5){
	console.log("Buzz");
	}else{
	console.log(m);
	}
	}
	// 4. I have to celebrate you baby
	var getReview = function (movie) {
	switch(movie){
	case "Matrix":
	return "good trip out";
	case "Princess Bride":
	return "awesome date night movie";
	case "Welcome to America":
	return "Amjad's favorite";
	case "Remember the Titans":
	return "love the sports";
	case "Why do I look like I'm 12?":
	return "The Ryan and Zach story";
	case "Fighting Kangaroos in the wild":
	return "Token Australian movie for Leng";
	default:
	return "I don't know!";
	}
	};
	// 5. I have to praise you like I should!
	// any topics you want us to review, email contact@codecademy.com
	// if you want to see the winning joke for this week, see the hint!
	// if you think you have a better joke, send it in!
	console.log("I'm ready for Objects!");

view raw 1.js hosted with ❤ by GitHub

	// 1. Intro
	var bob = {};
	// 2. Properties
	var Spencer = {
	age: 22,
	country: "United States"
	};
	// make your own object here called Me
	var Me = {
	age: 29,
	country: "Japan"
	};
	// 3. Accessing Properties
	var bob = {
	name: "Bob Smith",
	age: 30
	};
	var susan = {
	name: "Susan Jordan",
	age: 25
	};
	// here we save Bob's information
	var name1 = bob.name;
	var age1 = bob.age;
	// finish this code by saving Susan's information
	var name2 = susan.name;
	var age2 = susan.age;
	// 4. Accessing Properties, Part 2
	// Take a look at our next example object, a dog
	var dog = {
	species: "greyhound",
	weight: 60,
	age: 4
	};
	var species = dog["species"];
	// fill in the code to save the weight and age using bracket notation
	var weight = dog["weight"];
	var age = dog["age"];
	// 5. Another Way to Create
	// Our bob object again, but made using a constructor this time
	var bob = new Object();
	bob.name = "Bob Smith";
	bob.age = 30;
	// Here is susan1, in literal notation
	var susan1 = {
	name: "Susan Jordan",
	age: 24
	};
	// Make a new susan2 object, using a constructor instead
	var susan2 = new Object();
	susan2.name = susan1.name;
	susan2.age = susan1.age;
	// 6. Putting it all together
	// help us make snoopy using literal notation
	// Remember snoopy is a "beagle" and is 10 years old.
	var snoopy = {
	species: "beagle",
	age: 10
	};
	// help make buddy using constructor notation
	// buddy is a "golden retriever" and is 5 years old
	var buddy = new Object();
	buddy.species = "golden retriever";
	buddy.age = 5;
	// 7. More Practice Making Objects
	var BMW = {
	cost: "too much",
	speed: 220,
	country: "Germany"
	};

view raw 2.js hosted with ❤ by GitHub

	// 1. Function Review
	// Accepts a number x as input and returns its square
	var square = function (x) {
	return x * x;
	};
	// Write the function multiply below
	// It should take two parameters and return the product
	var multiply = function(x, y){
	return x * y;
	};
	multiply(1, 1);
	// 2. So What's a Method?
	// here is bob again, with his usual properties
	var bob = new Object();
	bob.name = "Bob Smith";
	bob.age = 30;
	// this time we have added a method, setAge
	bob.setAge = function (newAge){
	bob.age = newAge;
	};
	// here we set bob's age to 40
	bob.setAge(40);
	// bob's feeling old. Use our method to set bob's age to 20
	bob.setAge(20);
	// 3. Why Are Methods Important?
	var bob = new Object();
	bob.age = 30;
	// this time we have added a method, setAge
	bob.setAge = function (newAge){
	bob.age = newAge;
	};
	bob.getYearOfBirth = function () {
	return 2012 - bob.age;
	};
	console.log(bob.getYearOfBirth());
	// 4. The "This" Keyword
	// here we define our method using "this", before we even introduce bob
	var setAge = function (newAge) {
	this.age = newAge;
	};
	// now we make bob
	var bob = new Object();
	bob.age = 30;
	// and down here we just use the method we already made
	bob.setAge = setAge;
	// change bob's age to 50 here
	bob.setAge(50);
	// 5. "This" Works for Everyone
	// here we define our method using "this", before we even introduce bob
	var setAge = function (newAge) {
	this.age = newAge;
	};
	// now we make bob
	var bob = new Object();
	bob.age = 30;
	bob.setAge = setAge;
	// make susan here, and first give her an age of 25
	var susan = new Object();
	susan.age = 25;
	// here, update Susan's age to 35 using the method
	susan.setAge = setAge;
	susan.setAge(35);
	// 6. Make Your Own Method
	var rectangle = new Object();
	rectangle.length = 3;
	rectangle.width = 4;
	// here is our method to set the length
	rectangle.setLength = function (newLength) {
	this.length = newLength;
	};
	// help by finishing this method
	rectangle.setWidth = function(newWidth){
	this.width = newWidth;
	};
	// here change the width to 8 and length to 6 using our new methods
	rectangle.setWidth(8);
	rectangle.setLength(6);
	// 7. More Kinds of Methods
	var square = new Object();
	square.sideLength = 6;
	square.calcPerimeter = function() {
	return this.sideLength * 4;
	};
	// help us define an area method here
	square.calcArea = function() {
	return this.sideLength * this.sideLength;
	};
	var p = square.calcPerimeter();
	var a = square.calcArea();

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	// 1. The Object Constructor
	// here we make bob using the Object constructor
	var bob = new Object();
	bob.name = "Bob Smith";
	// add bob's age here and set it equal to 20
	bob.age = 20;
	// 2. Custom Constructors
	function Person(name,age) {
	this.name = name;
	this.age = age;
	}
	// Let's make bob and susan again, using our constructor
	var bob = new Person("Bob Smith", 30);
	var susan = new Person("Susan Jordan", 25);
	// help us make george, whose name is "George Washington" and age is 275
	var george = new Person("George Washington", 275);
	// 3. Try it Out!
	function Cat(age, color) {
	this.age = age;
	this.color = color;
	}
	// make a Dog constructor here
	function Dog(name, age) {
	this.name = name;
	this.age = age;
	}
	// 4. More Options
	function Person(name,age) {
	this.name = name;
	this.age = age;
	this.species = "Homo Sapiens";
	}
	var sally = new Person("Sally Bowles", 39);
	var holden = new Person("Holden Coulfield", 16);
	console.log("sally's species is " + sally.species + " and she is " + sally.age);
	console.log("holden's species is " + holden.species + " and he is " + holden.age);
	// 5. Constructors With Methods
	function Rectangle(length, width) {
	this.length = length;
	this.width = width;
	this.calcArea = function() {
	return this.length * this.width;
	};
	// put our perimeter function here!
	this.calcPerimeter = function() {
	return (this.length + this.width) * 2;
	}
	}
	var rex = new Rectangle(7,3);
	var area = rex.calcArea();
	var perimeter = rex.calcPerimeter();
	// 6. Constructors in Review
	// first we can make the instructor
	function Rabbit(adjective) {
	this.adjective = adjective;
	this.describeMyself = function() {
	console.log("I am a " + this.adjective + " rabbit");
	};
	}
	// now we can easily make all of our rabbits
	var rabbit1 = new Rabbit("fluffy");
	var rabbit2 = new Rabbit("happy");
	var rabbit3 = new Rabbit("sleepy");
	rabbit1.describeMyself();
	rabbit2.describeMyself();
	rabbit3.describeMyself();

view raw 4.js hosted with ❤ by GitHub

	// 1. Arrays of Objects
	// Our person constructor
	function Person (name, age) {
	this.name = name;
	this.age = age;
	}
	// Now we can make an array of people
	var family = new Array();
	family[0] = new Person("alice", 40);
	family[1] = new Person("bob", 42);
	family[2] = new Person("michelle", 8);
	// add the last family member, "timmy", who is 6 years old
	family[3] = new Person("timmy", 6);
	// 2. Loop the loop
	// Our Person constructor
	function Person(name, age){
	this.name = name;
	this.age = age;
	}
	// Now we can make an array of people
	var family = new Array();
	family[0] = new Person("alice", 40);
	family[1] = new Person("bob", 42);
	family[2] = new Person("michelle", 8);
	family[3] = new Person("timmy", 6);
	// loop through our new array
	for(var i = 0; i < 4; i++){
	console.log(family[i].name);
	}
	// 3. Passing Objects into Functions
	// Our person constructor
	function Person (name, age) {
	this.name = name;
	this.age = age;
	}
	// We can make a function which takes persons as arguments
	// This one computes the difference in ages between two people
	var ageDifference = function(person1, person2) {
	return person1.age - person2.age;
	}
	var alice = new Person("Alice", 30);
	var billy = new Person("Billy", 25);
	// 4. Try it Out!
	// Our person constructor
	function Person (name, age) {
	this.name = name;
	this.age = age;
	}
	// We can make a function which takes persons as arguments
	// This one computes the difference in ages between two people
	var ageDifference = function(person1, person2) {
	return person1.age - person2.age;
	};
	// Make a new function, olderAge, to return the age of
	// the older of two people
	var olderAge = function(person1, person2){
	return person1.age < person2.age ? person2.age: person1.age;
	};
	// Let's bring back alice and billy to test our new function
	var alice = new Person("Alice", 30);
	var billy = new Person("Billy", 25);
	console.log("The older person is "+olderAge(alice, billy));

view raw 5.js hosted with ❤ by GitHub

	// 1. What Are Objects For?
	var spencer = {
	age: 22,
	country: "United States"
	};
	// make spencer2 here with constructor notation
	var spencer2 = new Object();
	spencer2.age = 22;
	spencer2.country = "United States";
	// 2. Properties
	var snoopy = new Object();
	snoopy.species = "beagle";
	snoopy.age = 10;
	// save Snoopy's age and species into variables
	// use dot notation for snoopy's species
	var species = snoopy['species'];
	// use bracket notation for snoopy's age
	var age = snoopy['age'];
	// 3. Methods
	function Circle (radius) {
	this.radius = radius;
	this.area = function () {
	return Math.PI * this.radius * this.radius;
	};
	// define a perimeter method here
	this.perimeter = function() {
	return this.radius * 2 * Math.PI;
	};
	};
	// 4. Customizing Constructors
	// 3 lines required to make the iliad
	var harry_potter = new Object();
	harry_potter.length = 350;
	harry_potter.author = "J.K. Rowling";
	// A custom constructor for book
	function Book (length, author) {
	this.length = length;
	this.author = author;
	}
	// Use our new constructor to make the_hobbit in one line
	var the_hobbit = new Book(320, "J.R.R. Tolkien");

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