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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Class 1 - Intro to JavaScript - Girl Develop It</title>
<meta name="description" content="Girl Develop It framework for easily creating beautiful presentations using HTML in GDI theme. Forked from Hakim El Hattab's reveal.js">
<meta name="author" content="Girl Develop It">
<meta name="apple-mobile-web-app-capable" content="yes" />
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" />
<link rel="stylesheet" href="css/reveal.css">
<link rel="stylesheet" href="css/theme/simple.css" id="theme">
<link rel="stylesheet" href="css/custom.css">
<!-- For syntax highlighting -->
<!-- light editor --> <link rel="stylesheet" href="lib/css/light.css">
<!-- dark editor <link rel="stylesheet" href="lib/css/dark.css">-->
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<link rel="stylesheet" href="plugin/accessibility-helper/css/accessibility-helper.css">
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<link rel="stylesheet" href="css/print/pdf.css" type="text/css" media="print">
<link rel="icon" type="image/x-icon" href="favicon.ico" />
<!--[if lt IE 9]>
<script src="lib/js/html5shiv.js"></script>
<![endif]-->
</head>
<body>
<div class="reveal">
<div class="slides">
<section>
<h2>Introduction to JavaScript</h2>
<img src="img/circle-gdi-logo.png" alt="BDI Logo" class="noborder" style="max-height:400px;">
<h2>Class 1</h2>
</section>
<section>
<h3>Welcome!</h3>
<div class = "left-align">
<p><b>Girl Develop It</b> 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>
</div>
</section>
<section>
<h2>Welcome!</h2>
<div class = "left-align">
<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>
</div>
</section>
<!-- What is JavaScript-->
<section>
<h3>What is JavaScript?</h3>
<img src="img/not-java.png" alt="Java logo with a no symbol"/>
<p>JavaScript is not Java</p>
</section>
<section>
<h3>JavaScript is the language of the web</h3>
<img src="img/client-server.jpg" alt="Laptop and server connected via the internet"/>
<p>
<small 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></small>
</p>
</section>
<section>
<h3>JavaScript works with HTML & 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>Created by Brendan Eich as "LiveScript" in 1995, which got renamed to "JavaScript"</li>
<li>Standardized by the <b>ECMAScript</b> specifications. This class covers <a href="http://www.ecma-international.org/ecma-262/5.1/">ES5</a> (standardized in 2009)</li>
<li>A <b>client-side processing language</b>. A browser reads the code and runs it directly.</li>
<li>Interfaces with <b>HTML</b> & <b>CSS</b>.</li>
<li>Lets you build dynamic webpages that respond to input from users.</li>
</ul>
</section>
<section>
<h3>What can JavaScript do?</h3>
<p>Image lightboxes</p>
<a href="https://gyazo.com/01b0065c2feee682dbffe3d7bf4e5545"><img src="https://i.gyazo.com/01b0065c2feee682dbffe3d7bf4e5545.gif" alt="https://gyazo.com/01b0065c2feee682dbffe3d7bf4e5545"/></a>
</section>
<section>
<h3>What can JavaScript do?</h3>
<p>Fully featured web applications</p>
<a href="https://gyazo.com/1ea0791eece706f4ab9ff8213a4e1fbf"><img src="https://i.gyazo.com/1ea0791eece706f4ab9ff8213a4e1fbf.gif" alt="https://gyazo.com/1ea0791eece706f4ab9ff8213a4e1fbf"/></a>
</section>
<section>
<h3>What can JavaScript do?</h3>
<p>Keep track of users with <a href="https://en.wikipedia.org/wiki/HTTP_cookie">Cookies</a> or storing data with <a href="https://developer.mozilla.org/en-US/docs/Web/API/Window/localStorage">local storage</a>.</p>
<a href="https://gyazo.com/56208a5722a6f7ab682c2baddbba8ce3"><img src="https://i.gyazo.com/56208a5722a6f7ab682c2baddbba8ce3.gif" alt="https://gyazo.com/56208a5722a6f7ab682c2baddbba8ce3"/></a>
</section>
<section>
<h3>What can JavaScript do?</h3>
<p>Interactive elements like tabs, sliders, etc</p>
<a href="https://gyazo.com/4841d6f99367b28a1d6fca4395f408a2"><img src="https://i.gyazo.com/4841d6f99367b28a1d6fca4395f408a2.gif" alt="https://gyazo.com/4841d6f99367b28a1d6fca4395f408a2"/></a>
</section>
<section>
<h3>What can JavaScript do?</h3>
<p>Drawing & animation</p>
<a href="https://gyazo.com/6e183501f7ae5df7f07d37b9513ccfb9"><img src="https://i.gyazo.com/6e183501f7ae5df7f07d37b9513ccfb9.gif" alt="https://gyazo.com/6e183501f7ae5df7f07d37b9513ccfb9"/></a>
</section>
<section>
<h3>What can JavaScript do?</h3>
<p>
<a href="https://youtu.be/dvG9FgbzK9Y">Robots</a>
</p>
</section>
<!-- Using JavaScript -->
<section>
<h3>Running JavaScript</h3>
<ul>
<li>There are many ways to run JavaScript code. </li>
<li>In the first part of the class, we'll use a code playground called Repl.it</li>
<li>Repl.it is a tool for testing out (and learning!) different things in programming.</li>
</ul>
</section>
<section>
<h3>Let's Develop It</h3>
<ol>
<li>Open up a browser (Chrome, Safari, Firefox) and navigate to "repl.it"</li>
<li>Type "JavaScript" in the search and select it</li>
<li>Choose "continue as Anonymous"</li>
<li>Type the following into the code window (the left side), then click "Run"</li>
<pre><code class="javascript">console.log('Hello World!');
alert('Boop!');
</code></pre>
</ol>
</section>
<!-- 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>
<!-- JavaScript 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>
<div class="left-align">
<ol>
<li>You visit a website with JavaScript code on it.</li>
<li>Your browser (e.g., Chrome) reads the code line-by-line.</li>
<li>The browser 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 and creates an error message.</li>
</ol>
</div>
</section>
<!-- Using JavaScript -->
<section>
<h3>Statements</h3>
<p>Each instruction in JS is a "statement", like:</p>
<pre><code class="javascript">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 but computers will ignore.</p>
<pre><code class="javascript">/*
I can make long comments
with multiple lines here
*/
console.log('Hello World!'); // Or make short comments here</code></pre>
</section>
<section>
<h3>Getting results onto your screen</h3>
<p>Open a popup box.</p>
<pre><code class="javascript">alert('Hello World!');
</code></pre>
<p>Display a message in your console.</p>
<pre><code class="javascript">console.log('Hello World!');
</code></pre>
</section>
<section>
<h3>Let's Develop It</h3>
<ul>
<li>Open Repl.it back up</code>.</li>
<li>Add a comment to the code.</li>
<li>Try the different ways of printing a message.</li>
</ul>
</section>
<!-- Numbers-->
<section>
<h3>Numbers!</h3>
<img src="img/kitten-basket.jpg" alt="Cats in a basket"/>
<p class="credit">
<small>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></small>
</p>
</section>
<section>
<h3>Programming as a calculator</h3>
<ul>
<li>Like a calculator, programming languages understand arithmetic operations</li>
<pre><code class="javascript">5 + 5
100 * 20
23 - 8
</code></pre>
</ul>
</section>
<section>
<h3>Numbers</h3>
<p>JavaScript understands integers...</p>
<pre><code class="javascript">10 * 10
// 100
</code></pre>
<p>...and floating point numbers</p>
<pre><code class="javascript">.5 + 1
// 1.5
</code></pre>
</section>
<section>
<h3>Numbers</h3>
<p>JavaScript can't <em>always</em> figure out what you mean:</p>
<pre><code class="javascript">'what?' - 7
// NaN
</code></pre>
<p><code>NaN</code> = Not-A-Number</p>
</section>
</section>
<section>
<h3>Arithmetic Operators</h3>
<table>
<thead>
<tr>
<th>Example</th>
<th>Name</th>
<th>Result</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>-a</code></td>
<td> Negation</td>
<td>Opposite of <code>a</code>.</td>
</tr>
<tr>
<td><code>a + b</code></td>
<td>Addition</td>
<td>Sum of <code>a</code> and <code>b</code>.</td>
</tr>
<tr>
<td><code>a - b</code></td>
<td>Subtraction</td>
<td>Difference of <code>a</code> and <code>b</code>.</td>
</tr>
<tr>
<td><code>a * b</code></td>
<td>Multiplication</td>
<td>Product of <code>a</code> and <code>b</code>.</td>
</tr>
<tr>
<td><code>a / b</code></td>
<td>Division</td>
<td>Quotient of <code>a</code> and <code>b</code>.</td>
</tr>
<tr>
<td><code>a % b</code></td>
<td>Modulus</td>
<td>Remainder of <code>a</code> divided by <code>b</code>.</td>
</tr>
</tbody>
</table>
</section>
<section>
<h3>Let's Develop It</h3>
<p>Use the console (right screen) to try out some operators.</p>
</section>
</section>
<!-- Strings -->
<section>
<h3>Strings</h3>
<p>Variables can be strings (groups of characters). You put your string in single or double quotes.</p>
<pre><code class="javascript">'Fluffy'</code></pre>
<p>If you want to use a quote in your string, you'll need to <b>escape</b> it with a backslash.</p>
<pre><code class="javascript">'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">
<small>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></small>
</p>
</section>
<section>
<h3>String Operators</h3>
<p>You can put strings together with a <code>+</code>, the concatenation operator.</p>
<pre><code class="javascript">'Kittens' + 'McDougle'
// KittensMcDougle
</code></pre>
</section>
<section>
<h3>Gimmie Some Space!</h3>
<p>Remember that JavaScript doesn't know exactly what you want.</p>
<p>When combining strings, make sure to pay attention to white space</p>
<pre><code class="javascript">'Kittens' + ' ' + 'McDougle'
// Kittens McDougle
</code></pre>
</section>
<!-- Variables -->
<section>
<h3>Variables</h3>
<p>Just like 'x' in algebra, a variable is a named container for a value that can change.</p>
<img src="img/empty-glass.jpg" alt="Empty glass" class="noborder"/>
<p class="credit">
<small>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></small>
</p>
</section>
<section>
<h3>Declaring a Variable</h3>
<p>To declare (create) a variable, just type the word <code>var</code> and the variable name.</p>
<pre><code class="javascript">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="javascript">var numberOfKittens = 5;</code></pre>
</section>
<section>
<h3>Variable Values</h3>
<ul>
<li>When you first create a variable, it does not have a value (it is <code>undefined</code>).</li>
<li>You can set a value for a variable.</li>
<li>Variables can hold different types 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 should have a unique name.</li>
<li>Variable names need to start with a letter, <code>$</code>, or <code>_</code>.</li>
<li>Avoid <a href="https://developer.mozilla.org/en/JavaScript/Reference/Reserved_Words">reserved words</a>.</li>
<li>Choose clarity and meaning for humans to read later.</li>
</ul>
</section>
<section>
<h3>Naming Conventions</h3>
<ul>
<li>Variable names <em>cannot</em> have spaces</li>
<li>Names like <code>mycatsfullname</code> are hard to read</li>
<li>In JavaScript, we use a convention called "Camel Casing"</li>
<li>The first word is lowercase and the start of each subsequent work is capitalized:</li>
<pre><code class="javascript">var myFavoriteMovie;
var numberOfViewings;
</code></pre>
</ul>
</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="javascript">var numberOfKittens = 5;
console.log(numberOfKittens);
</code></pre>
</section>
<section>
<h3>Let's Develop It</h3>
<p>In your JavaScript file, create a variable and give it a valid name and value. Then, display the value.</p>
</section>
<!-- Data Types-->
<section>
<h3>Data Types</h3>
<ul>
<li><b>string</b> string of characters
<pre><code class="javascript">var userName = 'Jane Lane';</code></pre>
</li>
<li><b>number</b> integer or floating point
<pre><code class="javascript">var myAge = 30;</code></pre>
</li>
<li><b>boolean</b> true or false
<pre><code class="javascript">var catsAreBest = true;</code></pre>
</li>
<li><b>undefined</b> value that hasn't been defined
<pre><code class="javascript">var favoriteThings;</code></pre>
</li>
<li><b>null</b> an explicitly empty value
<pre><code class="javascript">var goodPickupLines = null;</code></pre>
</li>
</ul>
</section>
<section>
<h3>Concatenate!</h3>
<img src="img/concatenate.jpg" alt="Cat jumping on another cat."/>
<p class="credit">
<small>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></small>
</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>
<h3>Combining strings and numbers</h3>
<p>You can use concatenation to mix strings and numbers. When you do this, JavaScript will treat the number like a string.</p>
<pre><code class="javascript">var numberOfFruit = 6;
var typeOfFruit = 'bananas';
var allTheFruit = '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 restaurant. It should:</p>
<ul>
<li>Have variables for the bill <b>pre-tip</b> and the <b>tip percentage</b>.</li>
<li>Calculate the total bill.</li>
<li>Output a sentence like "Your total bill, with tip, is $14.75".</li>
<li>Bonus: Use <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toFixed" target="_blank"><code>toFixed()</code></a> to round the bill total to 2 decimals.</li>
</ul>
</section>
<!-- Final slides-->
<section>
<h3>You did it!</h3>
<img src="img/celebration.jpg" alt="People celebrating"/>
<p class="credit">
<small>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></small>
</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>
</div>
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