Code Year 2012 - Week 1

Code Year 2012の1週目。
JavaScriptの入門。変数の定義から、分岐や繰り返しを学んだ。
回答はgistに保存している。自分の勉強の記録のつもり。
まだまだ簡単。

	> Manabu
	ReferenceError: Manabu is not defined
	Oops, try again.
	> "Manabu"
	==> Manabu
	> "Manabu".length
	==> 6
	> 2+2
	==> 4
	> 2*2
	==> 4
	> Manabu
	ReferenceError: Manabu is not defined
	You've completed this lesson! Start the next one.
	>

view raw 1.txt hosted with ❤ by GitHub

	>
	> confirm("your message here")
	==> true
	> alert("your message");
	You've completed this lesson! Start the next one.
	>

view raw 2.txt hosted with ❤ by GitHub

	> myName
	ReferenceError: myName is not defined
	> var myName;
	> myName = "Manabu";
	==> Manabu
	> myName
	==> Manabu
	> var lastName = "Yamamoto";
	> var myFullName = "Manabu Yamamoto";
	> lastName.length
	==> 8
	You've completed this lesson! Start the next one.
	>

view raw 3.txt hosted with ❤ by GitHub

	> var number = 42;
	> number / 2;
	==> 21
	> number % 10;
	==> 2
	> var myString = "hello";
	> "hello".substring(0, 2);
	==> he
	> var three = "hello".substring(0, 2);
	Oops, try again.
	> var three = "Manabu".substring(0, 3);
	> "coding rules".replace("coding", "programming")
	==> programming rules
	> "hello world".toUpperCase();
	==> HELLO WORLD
	You've completed this lesson! Start the next one.
	>

view raw 4.txt hosted with ❤ by GitHub

	// 1
	// declare and set the variable named "today"
	// to today's weekday name
	var today = "Tuesday";
	// 2
	var array = [1, 4, 6];
	var number = array[2];
	// 3
	var numbers = [1, 2, 3];
	// 4
	var days = [];
	days[0] = "Monday";
	days[1] = "Tuesday";
	days[2] = "Wednesday";

view raw 5.js hosted with ❤ by GitHub

	// 1
	var number = 7;
	if( number === 7 ) {
	console.log( "you typed a 7!" );
	}
	// 2
	var name = "Annie";
	if (name === "Sam") {
	console.log("Your name is Sam!"); }
	else {
	console.log();
	};
	// 3
	var name;
	// Prompt for the user's name here.
	name = prompt("what's your name?");
	if(name === "Sam") {
	console.log("Your name is Sam!");
	} else{
	console.log("Your name isn't Sam!");
	};
	// 4
	var number = prompt("Guess what number I'm thinking of between 1 and 10!");
	if(number === "7") {
	console.log("You got it!");
	// Change the following line.
	} else if (number === "6") {
	console.log("Close! Try guessing a little higher.");
	} else {
	console.log("You were way off! Sorry...");
	}
	// 5
	var word = "that";
	if( word === "that" ) {
	console.log( "word is equal to 'that'" );
	}
	// 6
	var number = prompt( "pick a number between 1 and 10!" );
	if( number === 5 ) {
	console.log( "your number is 5" );
	}
	else if ( number > 5 ) {
	console.log( "your number is greater than 5" );
	}
	else if ( number < 5 ) {
	console.log( "your number is less than 5" );
	}
	// 7
	var response = prompt("Do you like me?");
	if (response = "yes") {
	console.log("I like you too!");
	}

view raw 6.js hosted with ❤ by GitHub

	// 1. +1
	var i = 0;
	i++;
	i++;
	console.log( "i is equal to " + i );
	// 2. -1
	var i = 2;
	i--;
	i--;
	console.log( "i is equal to " + i );
	// 3. A Little Bit Faster Now
	var i;
	for (i = 0; i < 2; i++) {
	console.log("i is now equal to " + i);
	}
	console.log("i is now equal to " + i);
	// 4. Down Down Down
	var i;
	for ( i = 2; i > 0; i-- ) {
	console.log( "i is now equal to " + i );
	};
	console.log( "i is now equal to " + i );

view raw 7.js hosted with ❤ by GitHub

	// 1. Keep It Going
	var i = 0;
	while ( i < 2 ) {
	console.log( "i is now " + i );
	i++;
	}
	// 2. Take a While
	var i = 0;
	while ( i < 2 ) {
	console.log( "hello" );
	i++;
	};
	// 3. Not So Fast
	var times = 0;
	while (times > 0 && times < 3) {
	console.log("the loop ran");
	times++;
	}
	// 4. Do It
	var i = 0;
	do {
	console.log("This is iteration " + (i + 1) + ".");
	i++;
	}
	while( i < 4 );

view raw 8.js hosted with ❤ by GitHub