Code Year 2012 - Week 7

今週の課題はループ。
forとwhileだけじゃなく、再帰を使ったループもあった。
再帰は普段使わないからけっこう手間取った。
8週目の課題がこなかったのはもたもたしてたからかな？

	// 1. Return of the "return"
	var add = function(number1, number2, number3) {
	// add up the numbers
	var sum = number1 + number2 + number3;
	// return the sum!
	return sum;
	};
	// call add twice here, assigning the return values
	// to new variables sum1 and sum2
	var sum1 = add(1, 2, 3);
	var sum2 = add(10, 10, -20);
	// 2. Objectionable Objects
	var australia = {
	weather: "superb",
	people: "not many of them but they're all great!",
	tourism: "a wonderful place to holiday. please visit!"
	};
	var jordan = new Object();
	jordan.weather = "hot. but so are the people!";
	jordan.people = "see above!";
	jordan.tourism = "Codecademy's dream team retreat!";
	// create your objects here
	var unitedStates = {
	weather: "of all sorts",
	people: "of all types",
	tourism: "outstanding place to do business!"
	};
	var hongKong = new Object();
	hongKong.weather = "sometimes quite muggy";
	hongKong.people = "was home to House";
	hongKong.tourism = "shop til you drop! eat till you pop!";
	// 3. The Dot and the Bracket
	var australia = {
	weather: "superb",
	people: "not many of them but they're all great!",
	tourism: "a wonderful place to holiday. please visit!"
	};
	var jordan = new Object();
	jordan.weather = "hot. but so are the people!";
	jordan.people = "see above!";
	jordan.tourism = "Codecademy's dream team retreat!";
	// print australia's weather using dot notation
	console.log(australia.weather);
	// create a new variable "property" and set it to "weather"
	var property = "weather";
	console.log(jordan[property]);
	// now modify "property" to be "people"
	property = "people";
	console.log(jordan[property]);
	// 4. MF! Methods and Functions
	var australia = {
	hemisphere: "southern",
	population: function(newArrivals) {
	return 20000000 + newArrivals;
	}
	};
	var australia2 = new Object();
	australia2.hemisphere = "southern";
	australia2.population = function(newArrivals){
	return 20000000 + newArrivals;
	};
	// create your objects and methods here
	var me = {
	planet: "Earth",
	age: function(yearBorn) {
	return 2012 - yearBorn;
	}
	};
	var jeremyLin = new Object();
	jeremyLin.team = "Knicks";
	jeremyLin.playGame = function(opponent){
	return "Tonight the Knicks square off against the " + opponent;
	};
	// 5. Placeholder: The "this" Keyword
	var setName = function(yourName){
	this.name = "Your name is " + yourName;
	};
	// create a human object with the desired method
	var human = {
	setHumanName: setName
	};
	// now call human.setHumanName
	human.setHumanName("Taro");
	// check to see that your method works by printing
	// human.name to the console
	console.log(human.name);

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	// 1. Crazy About Classes
	// create your class here
	function Candy(name){
	this.name = name;
	}
	// this code should print "chocolate" then "gummy bears"
	var chocolate = new Candy("chocolate");
	console.log( chocolate.name );
	var gummyBears = new Candy("gummy bears");
	console.log( gummyBears.name );
	// 2. Prototyping Fun
	// recreate your Candy class here
	function Candy(name){
	this.name = name;
	}
	// extend the prototype of Candy with a "printName" method
	Candy.prototype.printName = function() {
	console.log(this.name);
	};
	// testing code for your method
	var chocolate = new Candy("chocolate");
	chocolate.printName();
	var gummyBears = new Candy("gummy bears");
	gummyBears.printName();
	// 3. Sweet Inheritance
	// we set up a base class
	function Candy() {
	this.sweet = true;
	}
	// create a "Chocolate" class with a "type" argument
	function Chocolate(type){
	this.type = type;
	}
	// say that Chocolate inherits from Candy
	Chocolate.prototype = new Candy();
	// create a "choc" object using the Chocolate constructor
	// that has a "type" of "milk"
	var choc = new Chocolate("milk");
	// print the sweet and type properties of choc
	console.log(choc.sweet);
	console.log(choc.type);
	// 4. Keepin' it Private
	function Company(name,yearFounded,profitLevel) {
	this.name = name;
	this.year = yearFounded;
	this.profits = profitLevel;
	var bankBalance = 20;
	// add your method here
	this.getBalance = function() {
	return bankBalance - 2;
	};
	}
	var myCompany = new Company("Codecademy", "2011", "insufficient!");
	console.log( myCompany.getBalance() );

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	// 1. One to Five
	var i;
	for (i = 2; i <= 6; i++) {
	console.log(i);
	}
	// 2. Country by Twos
	var i;
	for (i = 2; i <= 6; i += 2) {
	console.log(i);
	}
	// 3. Countdown
	var i;
	for ( i = 5; i > -1; i--) {
	console.log(i);
	}

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	// 1. Looping Through Arrays
	var i;
	var animals = ["cat", "dog", "ferret"];
	// Loop goes here
	for(i = 0;i < animals.length; i++){
	console.log(animals[i]);
	}
	// 2. Better, Stronger, Faster
	var i;
	var animals = ["cat", "dog", "ferret"];
	var length = animals.length;
	// Loop goes here
	for(i = 0;i < length; i++){
	console.log(animals[i]);
	}
	// 3. Looping Through Strings
	var word = "code";
	// Loop goes here
	for(var i = 0; i < word.length; i++){
	console.log(word[i]);
	}
	// 4. Building `substring' (Part 1)
	// Define substring here
	var substring = function(input, start, end){
	var i;
	for(i = start; i <= end; i++){
	console.log(input[i]);
	}
	};
	// Write test here:
	// Call substring, passing "lorem ipsum dolor" to `input`, `6` to
	// `start`, and `10` to `end`.
	substring("lorem ipsum dolor", 6, 10);
	// 5. Building `substring' (Part 2)
	// Define substring here
	var substring = function(input, start, end){
	var subset = "";
	var i;
	for(i = start; i <= end; i++){
	subset += input[i];
	}
	return subset;
	};
	// Write test here:
	// Call substring, passing "lorem ipsum dolor" to `input`, `6` to
	// `start`, and `10` to `end`.
	console.log(substring("lorem ipsum dolor", 6, 10));

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	// 1. Conditions!
	var condition = true;
	while (condition) {
	console.log("I only print once!");
	condition = false;
	}
	// 2. Imitation is the Sincerest Form of Flattery
	var count = 1;
	while(count < 6){
	console.log(count);
	count++;
	}
	// 3. Counting Odd Numbers, Again
	var count = 1;
	while(count < 6){
	console.log(count);
	count += 2;
	}
	// 4. Splitting Names (Part 1)
	var name = "John Doe";
	var getFirstName = function(fullName){
	var i = 0;
	var length = fullName.length;
	while(i < length){
	console.log(fullName[i]);
	i++;
	}
	};
	getFirstName(name);
	// 5. Splitting Names (Part 2)
	var name = "John Doe";
	var getFirstName = function(fullName){
	var i = 0;
	var length = fullName.length;
	var next = fullName[0];
	while(i < length && " " != next){
	console.log(fullName[i]);
	i++;
	next = fullName[i];
	}
	};
	getFirstName(name);
	// 6. Splitting Names (Part 3)
	var name = "John Doe";
	var getFirstName = function(fullName){
	var i = 0;
	var length = fullName.length;
	var next = fullName[0];
	var firstName = "";
	while(i < length && " " != next){
	firstName += fullName[i];
	i++;
	next = fullName[i];
	}
	return firstName;
	};
	console.log(getFirstName(name));

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	// 1. Counting Up With Recursion (Part 1)
	var count = function(start){
	if(5 <= start){
	console.log(start);
	}
	};
	// 2. Counting Up With Recursion (Part 2)
	var count = function(start){
	if(5 <= start){
	console.log(start);
	}else{
	console.log(start);
	count(start + 1);
	}
	};
	count(1);
	// 3. Building `substring` With Recursion (Part 1)
	var substring = function(all, start, end){
	if(end <= start){
	console.log(all[start]);
	}
	};
	// 4. Building `substring` With Recursion (Part 2)
	var substring = function(all, start, end){
	if(end <= start){
	console.log(all[start]);
	}else{
	console.log(all[start]);
	substring(all, start + 1, end);
	}
	};
	substring("lorem ipsum dolor", 6, 10);
	// 5. Building `substring` With Recursion (Part 3)
	var substring = function(all, start, end){
	if(end <= start){
	return all[start];
	}else{
	return all[start] + substring(all, start + 1, end);
	}
	};
	console.log(substring("lorem ipsum dolor", 6, 10));

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	// 1. Looping Through Objects
	var person = {
	name: "Morgan Jones",
	telephone: "(650) 777 - 7777",
	email: "morgan.jones@example.com"
	};
	for (var propertyName in person) {
	// Your code here
	console.log(propertyName + ": " + person[propertyName]);
	}
	// 2. Nesting `for` Loops
	for(var i = 0; i < 3; i++){
	for(var j = 1; j <= 5; j++){
	console.log(j);
	}
	}
	// 3. Printing Out Tables (Part 1)
	var table = [
	["Person", "Age", "City"],
	["Sue", 22, "San Francisco"],
	["Joe", 45, "Halifax"]
	];
	for(var i = 0; i < table.length; i++){
	console.log(i);
	}
	// 4. Printing Out Tables (Part 2)
	var table = [
	["Person", "Age", "City"],
	["Sue", 22, "San Francisco"],
	["Joe", 45, "Halifax"]
	];
	for(var i = 0; i < table.length; i++){
	var row = table[i][0];
	for(var j = 1; j < table[i].length; j++){
	row += " " + table[i][j];
	}
	console.log(row);
	}
	// 5. Breaking Out
	while (true) {
	console.log("I only print once!");
	break;
	}

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