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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Class 3 - Intro to JavaScript - Girl Develop It</title>
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<div class="reveal">
<div class="slides">
<section>
<img src="img/circle-gdi-logo.png" alt="BDI Logo" class="noborder" style="max-height:400px;">
<h1>Introduction to JavaScript</h1>
<h2>Class 3</h2>
</section>
<!-- Loops -->
<section>
<h3>Loops</h3>
<img src="img/hula-hoop.jpg" alt="Lego stormtrooper inside key ring"/>
<p class="credit">Photo credit: <a href="http://www.flickr.com/photos/steve_pires/8430087504/" target="_blank">Steve Pires</a> <a href="http://creativecommons.org/licenses/by-nc/2.0/" target="_blank">cc</a></p>
</section>
<section>
<h3>While loops</h3>
<p><code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/while">while</a></code> will repeat the same code over and over until some condition is met.</p>
<pre class="javascript"><code>var bottlesOfBeer = 99;
while (bottlesOfBeer > 0) {
console.log(bottlesOfBeer + ' bottles of beer on the wall');
bottlesOfBeer = bottlesOfBeer - 1;
}</code></pre>
</section>
<section>
<h3>Infinite Loops</h3>
<p>Make sure something changes in the loop, or your loop will go on forever...</p>
<img src="img/infinite-loop.jpg" alt="Spiral that goes on toward infinity"/>
<p class="credit">Photo credit: <a href="http://www.flickr.com/photos/samueljohn/5348462863/" target="_blank">Samuel John</a> <a href="http://creativecommons.org/licenses/by-nc/2.0/" target="_blank">cc</a></p>
</section>
<section>
<h3>For loops</h3>
<p><code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for">for</a></code> loops are very similar, but you declare a counter in the statement.</p>
<pre><code class="javascript">// will count 1 to 10
for (var i = 1; i <= 10; i++) {
console.log(i);
}</code></pre>
</section>
<section>
<h3>Loops and logic</h3>
<p>You can add other statements or logical operators inside the loops.</p>
<pre><code class="javascript">// Count from 1 to 100
for (var i = 1; i <= 100; i++) {
if (i % 3 === 0) {
// Says 'Fizz' after multiples of three
console.log(' Fizz');
} else if (i % 5 === 0) {
// Says 'Buzz' after multiples of five
console.log(' Buzz');
} else {
console.log(i);
}
}</code></pre>
</section>
<section>
<h3>Break</h3>
<p>To exit a loop, use the <code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/break">break</a></code> statement.</p>
<pre><code class="javascript">// Count from 100 to 200
for (var i = 100; i <= 200; i++) {
console.log('Testing ' + i);
//Stop at the first multiple of 7
if (i % 7 == 0) {
console.log('Found it! ' + i);
break;
}
}</code></pre>
</section>
<section>
<h3>Let's Develop It</h3>
<p>Write a loop that gives you the 9's times table,<br /> from <strong>9 x 1 = 9</strong> to <strong>9 x 12 = 108</strong>.</p><br />
<p>Finish early? Try using a loop inside a loop to write all the times tables, from 1 to 12.</p>
</section>
<!-- Arrays -->
<section>
<h3>Arrays</h3>
<img src="img/kitten-group.jpg" alt="Group of kittens"/>
<p class="credit">Photo credit: <a href="http://www.flickr.com/photos/pasotraspaso/4444291348/" target="_blank">Jesus Solana</a> <a href="http://creativecommons.org/licenses/by-nc/2.0/" target="_blank">cc</a></p>
</section>
<section>
<h3>Arrays</h3>
<p><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array">Arrays</a> are ordered lists of values.</p>
<pre><code class="javascript">var arrayName = [value0, value1];</code></pre><br />
<p>You can put different types of data into an array.</p>
<pre><code class="javascript">var rainbowColors = ['Red', 'Orange', 'Yellow', 'Green',
'Blue', 'Indigo', 'Violet'];
var lotteryNumbers = [33, 72, 64, 18, 17, 85];
var myFavoriteThings = ['Broccoli', 1024, 'Sherlock'];</code></pre>
</section>
<section>
<h3>Array Length</h3>
<p>The <code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/length">length</a></code> property tells you how many things are in an array.</p>
<pre><code class="javascript">var rainbowColors = ['Red', 'Orange', 'Yellow', 'Green',
'Blue', 'Indigo', 'Violet'];
console.log(rainbowColors.length);</code></pre>
</section>
<section>
<h3>Using Arrays</h3>
<p>You can access items with <strong>bracket notation</strong> by using the position of the item you want.</p>
<pre><code class="javascript">var rainbowColors = ['Red', 'Orange', 'Yellow', 'Green',
'Blue', 'Indigo', 'Violet'];
var firstColor = rainbowColors[0];
var lastColor = rainbowColors[6];</code></pre><br>
<p>JS arrays are <strong>zero-indexed</strong>, so counting starts at 0.</p>
</section>
<section>
<h3>Changing arrays</h3>
<p>You can use bracket notation to change an item in an array</p>
<pre><code class="javascript">var myFavoriteThings = ['Broccoli', 1024, 'Sherlock'];
myFavoriteThings[0] = 'Asparagus';</code></pre>
</section>
<section>
<h3>Expanding arrays</h3>
<p>Arrays do not have a fixed length. You can use <code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/push">push</a></code> to add something to an array.</p>
<pre><code class="javascript">var myFavoriteThings = ['Broccoli', 1024, 'Sherlock'];
myFavoriteThings.push('Dancing');</code></pre>
</section>
<section>
<h3>Let's Develop It</h3>
<p>Create an array of your favorite foods. <br />Print a few values onto your screen.</p>
</section>
<!-- Arrays and loops-->
<section>
<h3>Arrays + loops = BFF</h3>
<img src="img/holding-hands.jpg" alt="Couple holding hands"/>
<p class="credit">Photo credit: <a href="http://www.flickr.com/photos/mtsofan/8221708017/" target="_blank">John</a> <a href="http://creativecommons.org/licenses/by-nc/2.0/" target="_blank">cc</a></p>
</section>
<section>
<h3>Iterating through arrays</h3>
<p>Use a <code>for</code> loop to easily work with each item in an array.</p>
<pre><code class="javascript">var rainbowColors = ['Red', 'Orange', 'Yellow', 'Green',
'Blue', 'Indigo', 'Violet'];
for (var i = 0; i < rainbowColors.length; i++) {
console.log(rainbowColors[i]);
}</code></pre>
</section>
<section>
<h3>Let's Develop It</h3>
<p>Use a <code>for</code> loop to print a list of all your favorite foods.</p>
</section>
<!-- Objects -->
<section>
<h3>Objects</h3>
<img src="img/matches.jpg" alt="Collection of matches"/>
<p class="credit">Photo credit: <a href="https://flic.kr/p/8RnSsa">Jirí Volejník</a> <a href="http://creativecommons.org/licenses/by-nc-sa/2.0/">cc</a>
</section>
<section>
<h3>Objects</h3>
<p><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Working_with_Objects">Objects</a> let us store a collection of properties.</p>
<pre><code class="javascript">var objectName = {
propertyName: propertyValue,
propertyName: propertyValue
};
</code></pre>
<pre><code class="javascript">var user = {
hometown: 'Atlanta, GA',
hair: 'Auburn',
likes: ['knitting', 'code'],
birthday: {month: 10, day: 17}
};</code></pre>
</section>
<section>
<h3>Accessing Objects</h3>
<p>You can retrieve values using <strong><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Property_Accessors#Dot_notation">dot notation</a></strong></p>
<pre><code class="javascript">var user = {
hometown: 'Atlanta, GA',
hair: 'Auburn'
};
var usersHometown = user.hometown;</code></pre><br>
<p>Or using <strong><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Property_Accessors#Bracket_notation">bracket notation</a></strong> (like arrays)</p>
<pre><code class="javascript">var usersHair = user['hair'];</code></pre>
</section>
<section>
<h3>Changing Objects</h3>
<p>You can use dot or bracket notation to change properties</p>
<pre><code class="javascript">var user = {
hometown: 'Atlanta, GA',
hair: 'Auburn'
};
user.hair = 'blue';</code></pre><br>
<p>Add new properties</p>
<pre><code class="javascript">user.married = true;
</code></pre><br>
<p>Or delete them</p>
<pre><code class="javascript">delete user.married;</code></pre>
</section>
<section>
<h3>Arrays of Objects</h3>
<p>Because arrays can hold any data type, they can also hold objects.</p>
<pre><code class="javascript">var users = [
{name: 'Jolene', age: 21},
{name: 'Alexa', age: 18}
];
for (var i = 0; i < users.length; i++) {
var user = users[i];
console.log(user.name + ' is ' + user.age + ' years old.');
}</code></pre>
</section>
<section>
<h3>Objects</h3>
<p>Just like other data types, objects can be passed into functions:</p>
<pre><code class="javascript">var jolene = {
age: 21,
hairColor: 'Auburn',
likes: ['pizza', 'tacos'],
birthday: {month: 3, day: 14, year: 1995}
}
function describeUser(user) {
console.log('You are ' + user.age + ' years old with '
+ user.hairColor + ' hair.');
}
describeUser(jolene);</code></pre>
</section>
<section>
<h3>Let's Develop It</h3>
<p>Create an object to hold information on your favorite recipe. It should have properties for:</p>
<ul>
<li><code>recipeTitle</code> (a string)</li>
<li><code>servings</code> (a number)</li>
<li><code>ingredients</code> (an array of strings)</li>
<li><code>directions</code> (a string)</li>
</ul>
<br><br>
<p>Try displaying some information about your recipe.</p>
<p>Bonus: Create a loop to list all the ingredients.</p>
</section>
<!-- Object Methods -->
<section>
<h3>Object methods</h3>
<p>Objects can also hold functions.</p>
<pre><code class="javascript">var jolene = {
age: 21,
hairColor: 'Auburn',
talk: function() {
console.log('Hello!');
},
eat: function(food) {
console.log('Yum, I love ' + food);
}
};
</code></pre><br>
<p>Call object methods using dot notation:</p>
<pre><code class="javascript">jolene.talk();
jolene.eat('pizza');</code></pre>
</section>
<section>
<h3>Let's Develop It</h3>
<p>Go back to your recipe object. Add a function called <code>letsCook</code> that says "I'm hungry! Let's cook..." with the name of your recipe title.</p>
<p>Call your new method.</p>
</section>
<!-- Final slides-->
<section>
<h3>You did it!</h3>
<img src="img/fireworks.jpg" alt="Fireworks"/>
<p class="credit">Photo credit: <a href="http://www.flickr.com/photos/markwdw85/9425240584/" target="_blank">Mark W.</a> <a href="http://creativecommons.org/licenses/by-nc/2.0/" target="_blank">cc</a></p>
</section>
<section>
<h3>Resources</h3>
<ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide" target="_blank">JavaScript Guide</a>, from the Mozilla Developers Network.</li>
<li><a href="http://www.codecademy.com/tracks/javascript" target="_blank">Code Academy</a>, with interactive JavaScript lessons to help you review.</li>
</ul>
</section>
<section>
<h2>Questions?</h2>
</section>
</div>
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Intro to JavaScript -- Girl Develop It --
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