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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Class 1 - 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 1</h2>
</section>
<!-- Welcome -->
<section>
<section>
<h2>Welcome!</h2>
<p>Girl Develop It is here to provide affordable and accessible programs to learn software through mentorship and hands-on instruction.</p>
<br />
<h4>Some "rules"</h4>
<ul>
<li>We are here for you!</li>
<li>Every question is important</li>
<li>Help each other</li>
<li>Have fun</li>
</ul>
</section>
<section>
<h2>Welcome!</h2>
<h4>Tell us about yourself.</h4>
<ul>
<li>Who are you?</li>
<li>What do you hope to get out of the class?</li>
<!-- Feel free to change the icebreaker question! -->
<li>What's your favorite ice cream flavor?</li>
</ul>
</section>
</section>
<!-- What is JavaScript-->
<section id="whatis">
<section>
<h3>JavaScript is NOT Java</h3>
<img src="img/not-java.png" alt="Java logo with a no symbol"/>
</section>
<section>
<h3>JavaScript is a client-side language</h3>
<img src="img/client-server.jpg" alt="Laptop and server connected via the internet"/>
<p class="credit">Photo credits: <a href="http://www.flickr.com/photos/papalars/5210226441/" target="_blank">Andrew E. Larson</a> and <a href="http://www.flickr.com/photos/johnseb/3425464/" target="_blank">John Seb Barber</a> <a href="http://creativecommons.org/licenses/by-nc/2.0/" target="_blank">cc</a></p>
</section>
<section>
<h3>JavaScript works with HTML and CSS</h3>
<img src="img/triangle.jpg" alt="Triangle"/>
<p class="credit">Photo credit: <a href="http://www.flickr.com/photos/ggunson/44539990/">Gillicious</a> <a href="http://creativecommons.org/licenses/by-nc-sa/2.0/">cc</a>
</section>
<section>
<h3>JavaScript lets you reuse code</h3>
<img src="img/desert-landscape.jpg" alt="Desert landscape"/>
<p class="credit">Photo credit: <a href="http://www.flickr.com/photos/philsnyder/4216356826/" target="_blank">Phil Synder</a> <a href="http://creativecommons.org/licenses/by-nc/2.0/" target="_blank">cc</a></p>
</section>
<section>
<h3>What is JavaScript?</h3>
<ul>
<li>JavaScript is standardized by the "ECMAScript" specifications.</li>
<li>JavaScript is a client-side processing language. A browser reads the code and runs it directly.</li>
<li>JavaScript interfaces with HTML and CSS.</li>
<li>With JavaScript, you can write code once and use it everywhere. Remember, you want DRY code (Don't Repeat Yourself).</li>
<li>JavaScript lets you build dynamic webpages that respond to input from users.</li>
</ul>
</section>
<section>
<h3>Let's Develop It</h3>
<p>Let's write your first JavaScript program. Make a folder called gdi. Inside, make a new page called index.html. Place this code inside.</p>
<pre><code class="html"><!DOCTYPE html>
<html>
<head>
<title>Test Page</title>
</head>
<body>
<p>This is my awesome JavaScript code.</p>
<script>
alert('Hello World!');
console.log ('Secret message');
</script>
</body>
</html>
</code></pre>
</section>
</section>
<!-- Programming -->
<section id="programming">
<section>
<h3>Computers need simple, clear instructions</h3>
<img src="img/confusedrobot.jpg" alt="Confused robot"/>
<p class="credit">Photo credit: <a href="http://www.flickr.com/photos/baboon/3946055/" target="_blank">baboon</a> <a href="http://creativecommons.org/licenses/by-nc/2.0/" target="_blank">cc</a></p>
</section>
<section>
<h3>Thinking like a programmer</h3>
<p>Computers are great at <em>processing</em>. They are bad at <em>understanding</em>.</p>
<p>When you write a program, you must break down every step into simple pieces.</p>
</section>
<section>
<h3>Example: Draw a Square</h3>
<ol class="fragment">
<li>Find a whiteboard and a dry erase marker</li>
<li>Uncap the dry erase maker</li>
<li>Hold the marker in your hand</li>
<li>Place the marker against the whiteboard</li>
<li>Move your hand 1 foot to the right</li>
<li>Stop</li>
<li>Move your hand 1 foot down...</li>
</ol>
</section>
<section>
<h3>Example: Make a Sandwich</h3>
<iframe title="Sandwich video" width="560" height="315" src="https://www.youtube.com/embed/XWe4iohhmIw" frameborder="0" allowfullscreen></iframe>
<p class="credit">Source: <a>Harvard Students Making Sandwich: CS 50 Algorithm Intro</a></p>
</section>
<section>
<h3>Basically, computers can be hard to work with!</h3>
<img src="img/computer-toddler.jpg" alt="Toddler using old word processor"/>
<p class="credit">Photo credit: <a href="https://flic.kr/p/5Uvapm" target="_blank">Dan Hatton</a> <a href="https://creativecommons.org/licenses/by-nc-nd/2.0/" target="_blank">cc</a></p>
<aside class="notes">Reassure the students! Coding is difficult, and it may take time to get good at it. Also, the natural state of code is broken. It's normal to have error messages, </aside>
</section>
</section>
<!-- JavaScript Basics -->
<section id="basics">
<section>
<h3>So what's up with JavaScript?</h3>
<img src="img/gears.jpg" alt="Gears"/>
<p class="credit">Photo credit: <a href="https://flic.kr/p/EEo4BV" target="_blank">Adam Foster</a> <a href="https://creativecommons.org/licenses/by-nc-nd/2.0/" target="_blank">cc</a></p>
</section>
<section>
<h3>How does JavaScript work?</h3>
<ol>
<li>A user visits a webpage with JavaScript code on it.</li>
<li>The user's browser (e.g., Chrome) reads the code line-by-line.</li>
<li>The browser executes (runs) each line of code as it reads it.</li>
<li>Based on these instructions, the browser performs calculations and changes the HTML and CSS on the page.</li>
<li>If the browser finds code it doesn't understand, it stops running an creates an error message.</li>
</ol>
</section>
<section>
<h3>Watch Out!</h3>
<p>Every browser interprets JavaScript differently.</p>
<p>You can see what's going on in the console.</p>
</section>
<section>
<h3>Let's Develop It</h3>
<p>Open the console. In Chrome or Firefox, use the keyboard shortcut <strong>Command + Option + J</strong> (Mac) or <strong>Control + Shift + J</strong> (Windows/Linux).</p>
<p>Open your practice page. Do you see anything in the console?</p>
<p>Try typing in 2 + 2</p>
</section>
</section>
<!-- Using JavaScript -->
<section id="usingJS">
<section>
<h3>Script Tags</h3>
<p>You can mix JavaScript and HTML. The script tag tells your browser the stuff inside is code, not content.</p>
<pre><code class="html"><script>
CODE GOES HERE
</script>
</code></pre>
</section>
<section>
<h3>JavaScript Files</h3>
<p>Just like CSS, you can split a long block of JavaScript into its own file. </p>
<pre><code class="html"><script src="path/to/file.js"></script>
</code></pre>
</section>
<section>
<h3>Separating Instructions</h3>
<p>After each individual statement, you must add a semicolon.</p>
<pre><code class="js">console.log('Hello World!');
console.log('I am glad to meet you');
console.log('I am fuzzy');
</code></pre>
</section>
<section>
<h3>Comments</h3>
<p>You can leave comments in your code—notes that people can read and computers will ignore.</p>
<pre><code class="js">/*I can make long comments
with multiple lines
like this*/
console.log('Hello World!'); //Or make short comments like this
</code></pre>
</section>
<section>
<h3>Getting results onto your screen</h3>
<p>Open a popup box.</p>
<pre><code class="js">alert('Hello World!');
</code></pre>
<p>Display a message in your console.</p>
<pre><code class="js">console.log('Hello World!');
</code></pre>
<p>Add something to the page.</p>
<pre><code class="js">document.write('Hello World!');
</code></pre>
</section>
<section>
<h3>Let's Develop It</h3>
<ul>
<li>Open index.html. Add a comment to the code.</li>
<li>Try different ways of printing your message.</li>
<li>Create a new file called mycode.js. Move your code to this file and link it to your page.</li>
</ul>
</section>
</section>
<!-- Variables -->
<section>
<section>
<h3>Variables</h3>
<p>A variable is a place to store values</p>
<img src="img/empty-glass.jpg" alt="Empty glass" class="noborder"/>
<p class="credit">Photo credit: <a href="http://www.flickr.com/photos/giuliag/3570562404/" target="_blank">giulia gasparro</a> <a href="http://creativecommons.org/licenses/by-nc/2.0/" target="_blank">cc</a></p>
</section>
<section>
<h3>Variable Values</h3>
<ul>
<li>When you first create a variable, it does not have a value (it is null).</li>
<li>You can set a value for a variable.</li>
<li>Variables can hold different types of information, like words, numbers, and collections of data.</li>
<li>The value of a variable can change over time.</li>
</ul>
</section>
<section>
<h3>Naming Variables</h3>
<ul>
<li>The variable name is case-sensitive.</li>
<li>A new variable needs to have a unique name.</li>
<li>Variable names need to start with a letter, $, or _.</li>
<li>Variable names can only be made of letters, numbers, $, or _.</li>
</ul>
</section>
<section>
<h3>Declaring a Variable</h3>
<p>To declare (create) a variable, just type the word "var" and the variable name.</p>
<pre><code class="js">var numberOfKittens;</code></pre>
<p>It is a good idea to give your variable a starting value. This is called initializing the variable.</p>
<pre><code class="js">var numberOfKittens = 5;</code></pre>
</section>
<section>
<h3>Using a Variable</h3>
<p>Once you have created a variable, you can use it in your code. Just type the name of the variable.</p>
<pre><code class="js">var numberOfKittens = 5;
console.log (numberOfKittens);
</code></pre>
</section>
<section>
<h3>Let's Develop It</h3>
<p>In your JS file, create a variable and give it a valid name and a value. Then, display the value.</p>
</section>
</section>
<!-- Variable Types and Operators-->
<!-- Numbers-->
<section>
<section>
<h3>Numbers!</h3>
<img src="img/kitten-basket.jpg" alt="Cats in a basket"/>
<p class="credit">Photo credit: <a href="http://www.flickr.com/photos/tom-poes/2159348460/" target="_blank">WJ van den Eijkhof</a> <a href="http://creativecommons.org/licenses/by-nc/2.0/" target="_blank">cc</a></p>
</section>
<section>
<h3>Numbers</h3>
<p>Variable can be numbers, either integers or floats (decimals).</p>
<pre><code class="js">var numberOfKittens = 5;
var cutenessRating = 9.6;
</code></pre>
<p>The browser will automatically convert integers to floats if needed</p>
</section>
<section>
<h3>Arithmetic Operators</h3>
<p>Once you have numbers, you can do math with them!</p>
<pre><code class="js">var numberOfKittens = 5;
var numberOfPuppies = 4;
var numberOfAnimals = numberOfKittens + numberOfPuppies;
</code></pre>
</section>
<section>
<h3>Arithmetic Operators</h3>
<table>
<thead>
<tr>
<th>Example</th>
<th>Name</th>
<th>Result</th>
</tr>
</thead>
<tbody>
<tr>
<td>-a</td>
<td>Negation</td>
<td>Opposite of a.</td>
</tr>
<tr>
<td>a + b</td>
<td>Addition</td>
<td>Sum of a and b.</td>
</tr>
<tr>
<td>a - b</td>
<td>Subtraction</td>
<td>Difference of a and b.</td>
</tr>
<tr>
<td>a * b</td>
<td>Multiplication</td>
<td>Product of a and b.</td>
</tr>
<tr>
<td>a / b</td>
<td>Division</td>
<td>Quotient of a and b.</td>
</tr>
<tr>
<td>a % b</td>
<td>Modulus</td>
<td>Remainder of a divided by b.</td>
</tr>
</tbody>
</table>
</section>
<section>
<h3>Let's Develop It</h3>
<p>Create two variables and try some arithmetic operators. Don't forget to display your results!</p>
</section>
</section>
<!-- Strings -->
<section>
<section>
<h3>Strings</h3>
<p>Variable can be strings, groups of characters. You put your string in quotes.</p>
<pre><code class="js">var kittensName = 'Fluffy';</code></pre>
<p>If you want to use a quote in your string, you'll need to "escape" it with a backslash.</p>
<pre><code class="js">console.log('I\'d like to use an apostrophe');</code></pre>
</section>
<section>
<h3>Playing with Strings</h3>
<img src="img/kitten-string.jpg" alt="Cat playing with string"/>
<p class="credit">Photo credit: <a href="http://www.flickr.com/photos/dirtbikedba/5796961878/" target="_blank">Mike Lawson</a> <a href="http://creativecommons.org/licenses/by-nc/2.0/" target="_blank">cc</a></p>
</section>
<section>
<h3>String Operators</h3>
<p>You can put strings together with a +, the concatenation operator.</p>
<pre><code class="js">var kittensName = 'Fluffy ';
var fullName = kittensName + 'McDougle';
console.log(fullName); //Outputs 'Fluffy McDougle'
</code></pre>
</section>
<section>
<h3>String Operators</h3>
<p>You can also use += to add things to the end of a string.</p>
<pre><code class="js">var kittensName = 'Admiral ';
kittensName += 'Snuggles';
console.log(kittensName); //Outputs 'Admiral Snuggles'
</code></pre>
</section>
<section>
<h3>Concatenate!</h3>
<img src="img/concatenate.jpg" alt="Cat jumping on another cat."/>
<p class="credit">Photo credit: <a href="http://www.flickr.com/photos/furlined/8191032061/" target="_blank">Matt</a> <a href="http://creativecommons.org/licenses/by-nc/2.0/" target="_blank">cc</a></p>
</section>
<section>
<h3>Let's Develop It</h3>
<p>Create two variables, a first name and a last name, and then put them together to make a full name. Don't forget to display your results!</p>
</section>
</section>
<section>
<section>
<h3>Combining strings and numbers</h3>
<p>You can use the concatenate function to mix strings and numbers. When you do this, JavaScript will treat the number like a string.</p>
<pre><code class="js">var numberOfFruit = 6;
var typeOfFruit = 'bananas';
var allTheFruit = 'Wow, I have ' + numberOfFruit + ' ' + typeOfFruit + '!';
console.log(allTheFruit);
</code></pre>
</section>
<section>
<h3>Let's Develop It</h3>
<p>Create a program to calculate the tip at a restuarant. It should:</p>
<ul>
<li>Have variables for the bill pre-tip and the tip percentage</li>
<li>Calculate the total bill</li>
<li>Output a sentence like "Your total bill, with tip, is $14.75"</li>
</ul>
</section>
</section>
<!-- Final slides-->
<section id="final">
<section>
<h3>You did it!</h3>
<img src="img/celebration.jpg" alt="People celebrating"/>
<p class="credit">Photo credit: <a href="http://www.flickr.com/photos/morphomir/2407451929/" target="_blank">Mircea</a> <a href="http://creativecommons.org/licenses/by-sa/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>
<li><a href="http://jsforcats.com/">JavaScript For Cats,</a> the basics of JavaScript explained with extra cats.</li>
</ul>
</section>
<section>
<h2>Questions?</h2>
</section>
</section>
</div>
<footer>
<div class="copyright">
Intro to JavaScript -- Girl Develop It --
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